Rozenia calliopsidis sp. n.

Female. Rozenia gen. n. differs from other genera of the family Stylopidae in having only four abdominal segments. Similarly to the genus Crawfordia Pierce, 1908, canalis prolifer of Rozenia gen. n. is with a single median tuba prolifera present on segments II-IV of the abdominal part of female. However, tuba prolifera III of Rozenia gen. n. is positioned on the posterior half of abdominal segment IV, but in the middle of segment IV in Crawfordia, which possesses also rudimentary segment V. Abdomen of other genera of the family Stylopidae is composed by higher number of segments.

Female puparium. Brood opening of the new genus is very wide, almost from side to side, about four times wider than intermandibular distance, or more in Rozenia gen. n. Brood opening is usually much narrower in other genera of the family Stylopidae. Narrow head corners are produced laterally beyond prothorax; this feature causes head to be wider than distal part of prothorax and side of cephalothorax is not continuously diverging posteriorly. This character is developed in Eurystylops Bohart, 1943 and some species of the genus Crawfordia. Head corners are relatively long, but not as long as in Crawfordia, which possess head corners longer than half of cephalothorax. In Rozenia gen. n. head corners are as long as head dorsally, but Crawfordia has much longer head corners than head dorsally. Mandibles extending from the head contour in ventral view. In contrast to Crawfordia, intersegmental ridges are not developed in Rozenia gen. n.

First instar. First instars of Rozenia gen. n. differ substantially from other genera by having setae of submedian row on thorax as well as on abdominal segments. Caudal setae are distinctly longer than body. Both these characters are unique among all Strepsiptera. Rozenia gen. n. does not have spinulae on posterior margin of thoracic tergites as in Xenidae, Halictophagidae, or Elenchidae. These spinulae are developed on posterior margin of thoracic tergites in all other genera of the family Stylopidae. Ventral sublateral bristle is missing on sternum IX in Rozenia gen. n., but probably present in all other genera of Strepsiptera. Posterior margin of labiomaxilary area continuous in Rozenia gen. n., but emarginated in Crawfordia, Halictoxenos and Stylops (and probably also in other Stylopidae).

Female. Canalis prolifer on abdominal segments I-IV, segment V absent. Single median tuba prolifera on segments II-IV, tuba prolifera on segment IV positioned in posterior half of segment.

Female puparium. Head corners (on ventral side) extending posteriorly as far as head posterior margin on dorsal side; head corners distinct, narrow, forming a lamella on frontal part of cephalothorax, produced laterally beyond prothorax, this feature causes head to be wider than distal part of prothorax and side of cephalothorax is not continuously diverging posteriorly; head corners elevated ventrally over intermandibular part of head, but not over prothorax; brood opening wide, distinctly wider than distance between mandibles; mandibles variable in size, but at least the tip is extending from the head contour in ventral view. Intersegmental ridges not developed; anterior margin of mesothorax ill-defined, but transverse and does not extend forward; spiracles positioned distally above prominent spiracular corners, close to middle of cephalothorax. Prothorax ventrally pigmented, not lighter than head corners.

Male. Unknown.

First instar. Body rounded; thorax approx. half of entire body length (caudal setae not included); caudal setae distinctly longer than body length. Head strongly reduced ventrally; maxilla with single seta; mandibles and labrum overlapping outline of body; labium fused to maxillae forming labiomaxillary area, its posterior margin continuous, not emarginated.

Each segment of thorax bears at least two pairs of setae dorsally and laterally close to posterior margin, forming submedian and lateral rows of setae. Posterior margins of thoracic tergites smooth. Coxae broad, ovate; three coxal teeth at anterior part of each coxa, all divided into two to four tips; one coxal bristle divided at least into two tips; up to five cuticular outgrowths laterally from coxal teeth and one very short seta anteriorly from cuticular outgrowths; one very short seta at posterior part of coxa. Each trochanterofemur with femoral spur bifid at tip; up to six cuticular outgrowths and one short seta anteriorly and posteriorly on femur; each tibia with five tibial spurs and small projections at distal end of tibia. Tarsi of fore and mid legs enlarged and elongated; tarsi of hind legs rod-like and elongated. Sternal figs broad and smooth on surface (paired setae missing).

Abdomen with rows of setae similar to those present on thorax. Abdominal segment X extremely shortened and fused to segment IX; segment XI split into two parts and restricted to ventral base of caudal setae; segment XI with one particularly long caudal seta and short lateral caudal seta. Posterior margins of abdominal tergites smooth except laterally, spinulae not immersed; posterior margin of abdominal sternites with spinulae, spinulae not immersed; segment IX with only two spinulae, ventral sublateral bristle is missing.

Bees of the genera Acamptopoeum and Calliopsis.

Named in honor of the excellent bee expert, teacher of generations of bee students and a friendly and knowledgeable man, Jerome G. Rozen Jr. (American Museum of Natural History, New York, USA). J.G. Rozen Jr., collected most of the specimens of all three new species used for the descriptions.

Holotype female puparium, in a separate microvial on the same pin as host. Original label: “CHILE: R.M.: Chacabuco / Caleu, nr. Cerro del Robie / 33°00'49"S, 70°58'59"W / 30 Nov 2004, J. S. Ascher, / A. Y. Kawahara, C. Espina”. 1 FP, host: Calliopsis (Liopoeum) trifasciata (Spinola, 1851), ♂, AMNH coll. (code: AMNH_BEE 00036534).

Paratypes: ARGENTINA: Salta prov.: Cafayete, 14.xi.1993, 1 FP, host: Calliopsis (Liopoeum) mendocina (Jörgensen, 1912) ♀, JG and BL Rozen leg., AMNH coll. (AMNH_BEE 00036520), ditto, 1 FP (AMNH_BEE 00036521), ditto (AMNH_BEE 00036522); Catamarca prov.: El Desmonte, 7.xi.1989, 1 FP, host: C. m. ♂, JG Rozen and A Roig-Alsina leg., AMNH coll. (AMNH_BEE 00036523), ditto 2 FPP (AMNH_BEE 00036524), San Fernando, 3.–6.xi.1989, 1 FP, host: C. m. ♀, JG Rozen and A Roig-Alsina leg., AMNH coll. (AMNH_BEE 00036525), ditto, 5.xi.1991, 1 FP, host: C. m. ♂, JG Rozen, LE Peña and A Ugarte leg., AMNH coll. (AMNH_BEE 00036529), ditto, 15.xi.1993, 1 FP, host: C. m. ♂, JG and BL Rozen leg., AMNH coll. (AMNH_BEE 00036528), Tinogasta 35 km SE, 28.xi.1989, 1 FP, host: C. m. ♂, JG Rozen and A Roig-Alsina leg., AMNH coll. (AMNH_BEE 00036526), Copacabana, 30.xi.1993, 1 FP, host: C. m. ♂, JG Rozen leg., AMNH coll. (AMNH_BEE 00036527), Punta de Balasto 3–15 km WSW, 25.xi.1993, 1 FP, host: C. m. ♀, JG Rozen leg., AMNH coll. (AMNH_BEE 00036530); Tucumán prov.: Amaichá del Valle, 6.iii.1990, 1 MP with pupa, host: C. m. ♂, JG Rozen leg., AMNH coll. (AMNH_BEE 00036532); Rio Negro prov.: El Bolson, 17.ii.1960, 1 FP, >50 L1, host: C. t. ♂, A Kovacs leg., AMNH coll. (AMNH_BEE 00036533); Neuquén prov.: Junín de los Andes, 21.–23.ii.2004, 2 FPP, host: C. t. ♀, J Straka leg. and det., JSPC coll.; CHILE: Apoquindo, Santiago, 1FP, host: C. t. ♂, date and collector not indicated, KUNHM coll. (SEMC1008235); Macul, SE Santiago, 5.xi.1974, 2 FPP, host: C. t. ♀, LE Peña leg., AMNH coll. (AMNH_BEE 00036536); Petorca prov.: Las Palmas tunnel, 18.x.1994, 2 FPP, host: C. t. ♂, JG Rozen, Quinter and JS Ascher leg., AMNH coll. (AMNH_BEE 00036535). Other material examined: Salta prov.: El Carmen, 27 km S Molinos, 1900 m, 6.x.1968, 1 EMP, host: C. m. ♀, LE Peña leg., AMNH coll. (AMNH_BEE 00036519). If not indicated otherwise, bee hosts identified by JS Ascher.

Female puparium. Rozenia calliopsidis sp. n. differs from other species of the genus by a narrower head with large mandibles. Brood opening turned backwards laterally, very close to posterior margin of mandible and continued as cephalic ridge. In other species, the brood opening fluently transforms into cephalic ridge and forms an arcuate line. Spiracular corners of this species are weakly prominent, obtuse, not triangular. Whole cephalothorax is darker than in R. platicephala sp. n. and R. peruana sp. n.

Figures 1–2. 

Female puparium, cephalothorax, with canalis prolifer of female, ventral view. 1 Rozenia calliopsidis sp. n. 2 Rozenia platicephala sp. n.

Figures 3–11. 

Female puparium, cephalothorax. 3, 6, 9 Rozenia calliopsidis sp. n., ventral and dorsal view 4, 7, 10 Rozenia peruana sp. n., ventral and dorsal view 5, 8, 11 Rozenia platicephala sp. n., ventral and dorsal view.

First instar. Shape of body narrower than in R. platicephala sp. n. Ratio of body length and width is on average 2.3. Ratio of body length and length of caudal setae is 0.74–0.96. Caudal setae are shorter than in R. platicephala sp. n.

Head dorsally with seven pairs of setae compared to six and usually shorter in R. platicephala sp. n. Labrum is not emarginated in the middle in contrary to R. platicephala sp. n. Labiomaxillary area more rounded than in R. platicephala sp. n., acute posteriorly.

Each segment of thorax bears only two pairs of setae dorsally and laterally, forming submedian and lateral row of setae, both rows continue on abdomen, interstitial and supralateral rows of setae missing. Posterior margin of abdominal tergites with more spinulae laterally than in R. platicephala sp. n. These spinulae are visible in dorsal view.

Sternal figs are broad and smooth on surface, posterior margin with fringe of long spinulae in contrast to smooth margins of R. platicephala sp. n. Precoxal pleural membrane of prothorax covered with transverse row of microtrichiae and precoxal pleural membrane of meso and metathorax with two cuticular processes laterally and medially.

Coxal teeth are usually divided into three to five tips; coxal bristle is divided into four or five tips on foreleg and into two tips on middle and hind legs; this bifurcation is more extensive in comparison to R. platicephala sp. n. Coxa and trochanterofemur with more cuticular outgrowths in comparison to R. platicephala sp. n.

Figures 12–15. 

First instars, dorsal and ventral view. 12, 14 Rozenia calliopsidis sp. n. 13, 15 Rozenia platicephala sp. n.

Figures 16–19. 

First instars, ventral view to head and dorsal view of total body. 16, 18 Rozenia platicephala sp. n. 17, 19 Rozenia calliopsidis sp. n.

Female. Canalis prolifer on abdominal segment I–IV. Tuba prolifera on segment IV positioned in posterior half of segment.

Female puparium. Cephalothorax slightly wider than long, approx. 0.7 mm long and approx. 0.8 mm wide between spiracular corners. Head wide, approx. 0.5 mm; mandible large, projecting from head contour, intermandibular distance 0.16–0.17 mm, mandibles approx. two mandibular diameters apart or less; labral apex between mandibles straight; oral ridge well developed; labral area very short; maxilla indistinct, but maxillary area with weak transverse elevation; brood opening wide, nearly from side to side, slightly sinuous, produced forward medially; head corners narrow, laterally turned posteriorly; posterolateral margin of head corner with weak apodeme; cephalic ridge well developed. Thorax without intersegmental ridges; pro-, meso- and metathorax largely fused ventrally as well as dorsally, segments seem to be subequal in length; thoracic stigma not developed; metathoracic ridge distinct, touching cintum and going up spiracle. Spiracular corners weakly prominent, obtuse; spiracula positioned anteriorly to spiracular corners, turned laterally; basal band distinct, arcuate, projecting forward, but anterior end not sharply delimited. Cephalothorax distinctly and uniformly light pigmented, only metathorax pale and translucent ventrally.

First instar. Total length (without caudal setae) 0.160–0.180 mm (n=6) on average; length of caudal setae up to 0.221 mm; ratio of body length and length of caudal seta 0.74–0.96. Ratio of body length and width approx. 2.2–2.3.

Head: Head dorsally with seven pairs of setae; ventrally strongly reduced, with setae on maxillae; mandibles and labrum overlapping outline of body; labrum not emarginated; labiomaxillary area occupying majority of ventral part of head, rounded, acute posteriorly.

Thorax: Each segment of thorax bears two pairs of setae dorsally and laterally close to posterior margin, forming submedian and lateral rows of setae (Figure 20). Posterior margins of thoracic tergites smooth. Coxae broad and ovate; three coxal teeth at anterior part of each coxa, all variably divided into two to four tips; coxal bristle variably divided into four or five tips on fore leg and extensively bifid on mid and hind legs; single cuticular outgrowth positioned medially from coxal bristle; five cuticular outgrowths laterally from coxal teeth and one very short seta above cuticular outgrowths; one very short seta at the posterior part of coxa. Each trochanterofemur with spur bifid at tip, five to six cuticular outgrowths and one short seta anteriorly and posteriorly on femur. Each tibia with five tibial spurs and short projections at distal end of tibiae. Tarsi of fore and mid legs enlarged and elongated, tarsus of hind leg rod-like and elongated. Sternal figs broad and smooth on surface and with fringe of long spinulae at its posterior margin. Precoxal pleural membrane with transverse row of microtrichia on prothorax and with two processes laterally and medially on mesothorax and metathorax.

Figures 20–23. 

Diagram of first instar chaetotaxy. 20, 22 Rozenia calliopsidis sp. n., thoracic and abdominal tergites; 21, 23 Rozenia platicephala sp. n., thoracic and abdominal tergites; a-submedian row of setae, b-interstitial row of setae, c-supralateral row of setae, d-lateral row of setae; point-stable presence of seta; circle-seta with unstable presence; large point-caudal seta.

Abdomen: Abdomen with rows of setae dorsally and laterally similar to those present on thorax (Figure 22); submedian row of setae from abdominal tergite I to tergite VIII; lateral row of setae up to tergite IX. Abdominal segment X extremely shortened and fused to segment IX; segment XI split in two parts and restricted on ventral base of caudal setae; segment XI with one particularly long caudal seta and short lateral caudal seta. Posterior margin of abdominal tergites smooth except for a few spinulae (up to six) laterally, few setae present laterally as well as mesally from lateral row of setae; posterior margin of sternites with spinulae, segment IX with only two long spinulae, which extend body outline; no spinulae immersed.

Name derived from the generic name of the host bee.

Argentina and Chile.

Holotype female puparium, in a separate microvial on same pin as host. Original label: “PERU: Lima dept. / Ricardo Palma, V-9-96 / J. G. Rozen, A. Ugarte”. 1 FP, host: Acamptopoeum vagans (Cockerell, 1926), ♀, JS Ascher det., AMNH coll. (code: AMNH_BEE 00026923).

Female puparium. Cephalothorax of R. peruana sp. n. strongly diverging posteriorly behind head (Figure 10). Among all the species of the genus R. peruana sp. n. has the smallest mandibles that, as in other species, project from the head contour. A very specific character is the shape of prothorax in dorsal view. Prothorax produced forward on lateral sides to the head margin, thus posterior head margin is sinuous (Figure 10). Prothorax is dorsally pigmented as in R. platicephala sp. n.

Female. Canalis prolifer on abdominal segment I–IV, with three large tuba prolifera on segments II-IV, tuba prolifera on segment I distinct, but very small and possibly not functional.

Female puparium. Cephalothorax slightly wider than long, approx. 0.7 mm long and approx. 0.9 mm wide between spiracular corners. Head wide, approx. 0.6 mm; mandible small, projecting from head contour, intermandibular distance 0.16 mm, mandibles nearly three mandibular diameters apart; labral apex between mandibles slightly arcuate; oral ridge well-developed; epipharinx weakly divided from very short labral area; maxilla indistinct; brood opening wide, nearly from side to side, arcuate; head corners narrow, directed posterolaterally; posterolateral margin of head corner with distinct apodeme; cephalic ridge weak. Thorax without intersegmental ridges; pro-, meso- and metathorax largely fused ventrally, segments seem to be subequal in length; prothorax dorsally slightly shorter than half length of fused meso- and metathorax, prothorax strongly produced forward laterally; metathorax as well as mesothorax laterally with remnant of stigmata; metathoracic ridge ill-defined, but distinct, touching cintum and going anterolaterally to spiracle. Spiracular corners prominent, triangular, well-developed; spiracle positioned anterior to spiracular corners, turned laterally; basal band arcuate, projecting forward, but ill-defined. All cephalothorax pale, head, prothorax dorsally, sides of thorax and spiracular corner light pigmented; rest of cephalothorax pale and translucent.

Name derived from the country, where the holotype was collected.

Peru.

Holotype female puparium, in a separate microvial on same pin as host. Original label: “CHILE: Cautin Prov. / Cunco, II-1998, / Perez de Arce”. 1 FP, host: Acamptopoeum submetallicum (Spinola, 1851), ♀, JS Ascher det., AMNH coll. (code: AMNH_BEE 00037984).

Paratypes: ARGentina: Córdoba prov.: Parral, Fundo Malcho, xi.1956, 1FP, host: A. s. ♂, LE Peña leg., KUNHM coll. (SEMC1006814). Chile: same as holotype, >500 L1; Limarí prov., 19 km ENE Samo Alto, 10.xi.1992, 1FP, host: A. s. ♀, JG Rozen, Sharkov and Snyder leg., AMNH coll. (AMNH_BEE 00037983); Cautin prov.: Cunco, ii.1998, 1 FP, host: A. s. ♀, Perez de Arce leg., AMNH coll. (AMNH_BEE 00037985); Bio Bío prov.: Antuco, nr. Hydroeléctrica, 37°23'49"S, 71°27'21"W, 14.xii.2004, 1 FP, host: A. s. ♂, JS Ascher leg., AMNH coll. (AMNH_BEE 00037986), ditto, 2 FPP, host: A. s. ♀, JS Ascher leg., AMNH coll. (AMNH_BEE 00037391); Dichato, 20.xii.1953, 1 FP, >500 L1, host: A. s. ♀, LE Peña leg., KUNHM coll. (SEMC1006914); Coquimbo prov.: Las Breas, 23.–24.x.1989, 1 FP, host: A. s. ♀, JG Rozen leg., AMNH coll. (AMNH_BEE 00037393); Santiago prov.: El Manzano, Valle Rio, Maipo, 1000-1500 m, i.1984, 1 FP, host: A. s. ♀, LE Peña leg., AMNH coll. (AMNH_BEE 00037394), El Manzano, Quebrada, 900-1500 m, 5.-6.ii.1983, 2 FPP, host: A. s. ♀, LE Peña leg., AMNH coll. (AMNH_BEE 00037395); Valdivia prov.: Valdivia, 9.ii.1953, 1 FP, host: A. s. ♀, collector not indicated, KUNHM coll. (SEMC1006957); Valparaíso prov.: Viňa del Mar, La Quinta Vergara, 18.xii.2004, 1 FP, host: A. s. ♀, JS Ascher leg., AMNH coll. (AMNH_BEE 00037397). Other material examined: Coquimbo prov.: Las Breas, 23.–24.x.1989, 1 EMP, host: A. s. ♂, JG Rozen leg., AMNH coll. (AMNH_BEE 00037392); Araucanía prov.: Malleco, Victoria, xii.1985, 1 EMP, host: A. s. ♀, LE Peña leg., AMNH coll. (AMNH_BEE 00037396). All hosts identified by JS Ascher.

Female puparium. This species possess relatively and also absolutely the widest head among all species of the genus. Spiracular corners are sharply triangular and distinctly prominent, but not large. Prothorax is more pigmented dorsally than other parts of thorax, like in R. peruana sp. n., but anterior and posterior margins are paralel, arcuate, producing forward on sides only slightly. Position of spiracula seems to be characteristic for this species. They are turned more dorsally than in other species, however this character is very variable and may be inconsistent. Pigmentation like in R. peruana sp. n.

First instar. Shape of body is more rounded than in R. calliopsidis sp. n., width of segments decreases from metathorax more strongly. Ratio of body length and width is on average 2.0. Ratio of body length and length of caudal setae is approx. 0.60–0.65. Caudal setae are relatively longest among all species.

Head dorsally with six pairs of setae compared to seven and usually longer in R. calliopsidis sp. n.; labrum is narrow at the middle contrary to R. calliopsidis sp. n.; labium is projecting more laterally than in R. calliopsidis sp. n.

Each segment of thorax bears four pairs of setae dorsally and laterally, forming submedian, interstitial, supralateral and lateral rows of setae. Sternal figs are broad and smooth on surface, specific are also smooth posterior margins. Precoxal pleural membrane is smooth without any projections except of one or two cuticular outgrowths on prothoracic precoxal pleural membrane. Coxal teeth are always bifid in two tips in contrast to R. calliopsidis sp. n. with as many as five tips; coxal bristle is always divided into two tips and bifurcation in middle leg and hind leg is not so extensive, there are no cuticular outgrowth by coxal bristle contrary to R. calliopsidis sp. n., also there are not so many cuticular outgrowths on coxa and femur like in R. calliopsidis sp. n.

All four pairs of rows of setae continues dorsally on abdomen, submedian row up to tergite XIII, interstitial row is on tergite II or in some specimens also on tergite I, supralateral row is variable and reach up to tergite III, IV or V, and lateral row up to tergite IX. Spinulae on posterial margins of abdominal tergites only beyond lateral row and not visible in dorsal view.

Female. Canalis prolifer on abdominal segment I–IV. Tuba prolifera on segment IV positioned in posterior half of segment.

Female puparium. Cephalothorax slightly wider than long, approx. 0.8 mm long and approx. 0.9–1.0 mm wide between spiracular corners. Head wide, approx. 0.7 mm; mandible projecting from head contour, intermandibular distance 0.17–0.21 mm, approx. two mandibular diameters apart, but variable among different individuals; labral apex between mandibles straight; oral ridge well developed; epipharinx weakly divided from labral area, short; maxilla not developed, but maxillary area with weak transverse elevation; brood opening wide, nearly from side to side, arcuate; head corners narrow, directed posterolaterally; posterolateral margin of head corner with distinct apodeme; cephalic ridge weak. Thorax without intersegmental ridges; pro-, meso- and metathorax largely fused ventrally, segments seem to be subequal in length, prothorax dorsally slightly shorter than half length of fused meso- and metathorax; meso- and metathorax laterally with remnants of stigma, mesothoracic spiraculum very small and hardly visible; metathoracic ridge ill-defined, but distinct, touching cintum and going up spiracle. Spiracular corners prominent, well developed; spiracula positioned anterior to spiracular corners, turned dorsally; basal band distinct but weak, arcuate, projecting forward. All cephalothorax pale, head and prothorax dorsally and head, prothorax and mesothorax light pigmented ventrally; spiracular area and basal band only slightly darker; rest of cephalothorax pale and translucent.

First instar. Total length approx. 0.154–0.175 mm (n=3) without caudal setae; length of caudal setae up to 0.289 mm (on an average 0.276 mm); ratio of body length and length of caudal setae approx. 0.60–0.65. Ratio of body length and width approx. 1.9–2.3.

Head: Head dorsally with six pairs of setae; ventrally strongly reduced; with setae on maxillae; distinctive mandibles and labrum overlapping outline of body; labrum emarginated; labiomaxillary area occupying majority of ventral part of head, rounded, posterior margin straight.

Thorax: Each segment of thorax bears four pairs of setae dorsally and laterally close to posterior margin forming submedian, interstitial, supralateral, and lateral rows of setae (Figure 21). Posterior margins of thoracic tergites smooth. Coxae broad and ovate; on each coxa three coxal teeth and one coxal bristle at anterior part of coxa, all bifid at tips; three or four cuticular outgrowths laterally from coxal teeth and one very short seta above cuticular outgrowths and one on posterior margin of coxa. Each trochanterofemur with femoral spur bifid at tip; two or three cuticular outgrowths and one short seta anteriorly and posteriorly on femur. Each tibia with five tibial spurs and little projections at distal end of tibiae. Tarsi of fore and middle legs enlarged and elongated, tarsi of hind legs rod-like and elongated. Sternal figs broad and smooth on surface and on posterior margins. Precoxal pleural membrane smooth without any projections except of one or two cuticular outgrowths on prothoracic precoxal pleural membrane.

Abdomen: Abdomen with rows of setae dorsally and laterally similar to those present on thorax; submedian row from abdominal tergite I to tergite VIII; interstitial row on tergite II or in some specimens also on tergite I; supralateral row variable up to tergite III, IV or V; lateral row up to tergite IX (Figure 23). Abdominal segment X extremely shortened and fused to segment IX; segment XI split in two parts and restricted only on ventral base of caudal setae; segment XI with particularly long caudal seta and short lateral caudal seta. Posterior margin of abdominal tergites smooth except for lateral part with a few spinulae (up to three) more laterally than lateral row of setae; posterior margin of sternites with spinulae, segment IX with only two longer spinulae, which extend body outline; no spinulae immersed.

Name of this species refers to characteristic flat head and general flat appearance of all Rozenia gen. n. species, when found between tergites of host bees.

Argentina and Chile.

A. submetallicum: Schwarz (1931: 78-79), record from Chile (as Liopoeum submetallicum (Spinola)), also reported by Hofeneder and Fulmek (1943: 35), but with no original data.

To R. platicephala sp. n. could be assigned findings of Strepsiptera in the host bee Acamptopoeum argentinum (Friese, 1906): Hofeneder and Fulmek (1943: 42), record from Argentina (as Perdita argentina Friese), repeated by Hofeneder (1949: 122) and later by Hofeneder (1952: 489) (as Calliopsis (Parafriesea) argentina (Friese)). The record is impossible to verify as reliable pending a review of the material. The information about material deposition is not known to us.