Odonaellus serratus sp. nov.

Body yellowish-brown. Crown yellow, with white stripe and a pair of small black spots at apex of crown connected to a black transverse marginal band. Eyes dark brown; ocelli yellowish-brown and on anterior margin of head. Pronotum with anterior yellowish brown and posterior brown. Face pale brown. Forewing yellowish, with brown arched lines and patchy spots. Legs brownish yellow.

Body robust. Head including eyes narrower than pronotum; crown slightly produced medially, shorter than width between eyes; ocelli on anterior margin, separated from corresponding eye by approximately their own diameter; face slightly flattened, its width narrower than length; anteclypeus slightly expanded apically. Pronotum obviously longer than wide, anterior margin strongly and roundly produced, posterior margin slightly concave. Scutellum triangular, wider than long, slightly longer than pronotum, with transverse suture depressed. Forewing hyaline, about 3 times as long as wide, with 4 apical cells and 3 subapical cells; inner subapical cell closed. Fore femur with 2 dorsoapical setae; row IC with stout setae; row AV with short, stout setae; tibia with 2 rows of setae. Hind femur broadened distally and slightly bowed; apical setal formula 2+2+1; tibia flattened and nearly straight, row PD with 28 macrosetae decreasing in length toward base; row AD with approximately 13 long stout setae and 0–4 shorter stout setae between each long seta.

Male genitalia. Male pygofer slightly longer than high, with paired ventral process or dorsal process, without macrosetae, and setae on posterior margin. Valve subtriangular. Subgenital plate without macrosetae or with a few small macrosetae and with wide base, slightly narrowed posteriorly, without digitiform apical extension. Aedeagal shaft arising from base with paired shafts, denticular, curved, U-shaped in ventral view, gonopore subapical. Connective Y-shaped, articulated with aedeagus. Style broad at base, subapically slightly concaved.

This new genus is placed in subtribe Eremophlepsiina based on the following: crown concavely depressed, with a pair of apical black submedial maculae; head narrower than the pronotum; wings macropterous; macrosetae on the male subgenital plate reduced or absent, pygofer with paired posterior processes, aedeagus with shafts arising from the base; and the female ovipositor extending far beyond the pygofer apex. The genus is distinguished from other Eremophlepsiina by the lack of irregular brown markings on the head and pronotum, the much less prominent brown vermiculate markings on the forewing, and the apically denticulate shafts of the aedeagus. The two included species differ for some characters mentioned in the subtribal diagnosis provided by Zahniser and Dietrich (2013), suggesting that the genus may be intermediate between Eremophlepsiina and Opsiina (see Remarks for individual species below).

The new genus name is derived from the Latin word “odona” and the diminutive suffix “-ellus”, in reference to the denticulate (tooth-like) processes on the aedeagal shaft. Gender: masculine.

Oriental region (China).

Color pattern of anterior dorsum and face as in Figs 1–4. Face yellow with a few brown stripes (Fig. 4).

Male genitalia. Male pygofer with one pair of finger-like dorsal processes arising caudally and with a few macrosetae along caudal margin; ventral margin expanded (Figs 5, 6). Valve small (Fig. 7). Subgenital plate with a few stout setae (Fig. 8). Aedeagal shaft lamellar, apical tapered and apcial inner margin dentate; gonopore subapical (Figs 10, 11). Connective with arms shorter than stem (Fig. 9). Style curved, apical apophysis stout and subapically concaved (Fig. 12).

Measurement. Length (including tegmen): ♂, 5.3–5.7 mm.

Holotype : • ♂, China: Yunnan, Mengla County, Mohan; 21°22'30"N, 101°75'46"E; 13 May 2015, coll. Qiang Luo (GUGC); paratypes: • 5 ♂♂, Yunnan, Mengla County, Mohan; 21°13'21"N, 101°44'59"E; 13 May 2015, coll. Qiang Luo; • 3 ♂♂, Yunnan, Mengla County, Menglun; 21°91'32"N, 101°26'83"E; 12 May 2015, coll. Qiang Luo (GUGC).

The new species name is Latin adjective serratus, “serrate”, used in reference to the apically aedeagal shaft toothed like a saw.

Figures 1–4. 

Odonaellus serratus sp. nov. 1 ♂, dorsal view 2 ♂, lateral view 3 ♂, head and thorax, dorsal view 4 ♂, face.

Figures 5–12. 

Odonaellus serratus sp. nov. 5 male pygofer side, lateral view 6 male pygofer side, ventral view 7 valve, ventral view 8 subgenital plates, ventral view 9 connective, ventral view 10 aedeagus, ventral view 11 aedeagus, lateral view 12 style, dorsal view.

This species disagrees with the subtribal diagnosis of Eremophlepsiina, as provided by Zahniser and Dietrich (2013), in having small macrosetae present laterally on the male subgenital plate, the pygofer process arising dorsally rather than ventrally, and the valve distinctly shorter than wide.

Color pattern of anterior dorsum and face as in Figs 13–20. Male pronotum dark brown with irregular fuscous spots (Fig. 15); female pronotum yellowish brown, without spot (Fig. 19).

Male genitalia. Male pygofer with one pair of sharp ventral processes arising caudally and a pair of tiny posteroventral process grown in dorsal inner surface (Figs 21, 22). Valve large (Fig. 23). Subgenital plate without macrosetae (Fig. 24). Aedeagal shaft auricular and subapical inner margin with a few small dentae; gonopore subapical (Figs 26, 27). Connective with arms shorter than stem (Fig. 25). Style curved; apical apophysis stout and subapically concave. (Fig. 28).

Figures 13–16. 

Odonaellus expansus sp. nov. 13 ♂, dorsal view 14 ♂, lateral view 15 ♂, head and thorax, dorsal view 16 ♂, face.

Figures 17–20. 

Odonaellus expansus sp. nov. 17 ♀, dorsal view 18 ♀, lateral view 19 ♀, head and thorax, dorsal view 20 ♀, face.

Figures 21–28. 

Odonaellus sp. nov. 21 male pygofer side, lateral view 22 male pygofer side, dorsal view 23 valve, ventral view 24 subgenital plates, ventral view 25 aedeagus, ventral view 26 aedeagus, lateral view 27 connective, ventral view 28 style, dorsal view.

Female pygofer with ventroposterior margin sharply incurved (Fig. 29). Female seventh sternum posterior margin concave, resulting in projection on both sides (Fig. 30). First valvula of ovipositor slightly curved, attenuate to apex, with indistinct scale-like sculpture ventrally (Figs 31, 32). Second valvula with small teeth near apex (Figs 33, 34).

Measurement. Length (including tegmen): ♂, 5.4–5.7 mm; ♀, 5.8–6.5 mm.

Holotype : • ♂, China: Guangxi Autonomous Region, Longzhou County, Nonggang; 22°25'21"N, 106°97'27"E; 4 May 2014, coll. Qu Wu (GUGC); paratypes: • 4 ♂♂ 5 ♀♀, Guangxi Autonomous Region, Longzhou County, Nonggang; 22°49'97"N, 106°97'49"E; 8 May 2012, coll. Zhiwei Fan, Hu Li; • 3 ♂♂, Guangxi Autonomous Region, Longzhou County, Nonggang; 22°52'66"N, 106°96'94"E; 4 May 2014, coll. Qu Wu (GUGC).

The new species name is Latin adjective expansus, “expanded”, which is in reference to the broadly expanded base of the aedeagal shaft.

Figures 29–34. 

Odonaellus expansus sp. nov. 29 female genital capsule, lateral view 30 seventh sternite, ventral view 31 first valvula, lateral view 32 detail of sculptures of first valvula 33 second valvula, lateral view 34 detail of sculpture on second valvula.

This species agrees more closely with the subtribal diagnosis of Eremophlepsiina (Zahniser and Dietrich 2013) than does the type species of the genus. Unlike O. serratus, O. expansus has the male valve nearly as long as wide, the pygofer process ventrally arising, and the subgenital plate lacking macrosetae as in other Eremophlepsiina.