Male. Vestiture: Moderately dense or dense, variegated; front coxa with a wide tuft of white setae. Body oval and stout. Head: Short, strongly constricted behind eyes, postocular lobe very short; eyes bulging, deeply emarginate; frons narrow, with sharp median carina; antennae pectinate from 4^th or 5^th segment. Prothorax: Pronotum subconical, without lateral carina; disc convex, slightly gibbous before scutellum and with shallow median channel; prosternal process narrow, triangular, acute. Meso- and metathorax: Scutellum square, bidentate apically; elytral striae regular; striae 4 and 5 abbreviated basally by tubercle. Legs: Metacoxa densely punctate; hind femur moderately swollen, ventral carinae obsolete. Internal ventral margin with small subapical spine, often followed by two smaller spines; hind tibia straight, enlarged, with complete or incomplete set of carinae, mucro longer than lateral coronal denticle. Abdomen: More or less telescoped, fifth sternite deeply emarginated; pygidium vertical. Genitalia: Internal sac of male genitalia lined with fine spines with or without sclerites; ventral valve deeply arcuate. Female. Similar to male, except antenna not pectinate, eyes less bulging, pygidium subvertical, last abdominal sternite not emarginated.

Male (Fig. 1a–b). Length (pronotum-elytra): 2.4–2.6 mm; width: 1.4–1.6 mm; maximum thoracic depth 1.5–1.7 mm. Color: Antennae with the first three segments yellowish, the rest dark or partially dark; head, prosternum, metasternum, base of meso-femur and meta-femora, and coxae dark; pronotum with two longitudinal dark bands, which may together form a dark spot; elyton variegate; pygidium with three pairs of dark spots, two apical, two median-lateral, and two basal; rest of body yellowish. Vestiture: Body with mixed yellowish and white pubescence; scutellum with whitish pubescence; fore coxa with a tuft of white setae; pygidium with yellowish and whitish pubescence forming a variegate pattern. Head: Short and broad, densely micropunctulate, frons with a strong median carina, distance between eyes 2.3.–3.3× as wide as eye width, eye cleft 0.60–0.71× its length by ocular sinus, posterior margin of eye protruding from adjacent surfaces, postocular lobe rounded and setose; distance from base of antennae to apex of labrum 0.39–0.55× as long as distance from upper limits of eyes to apex of labrum; antennomeres I–III filiform, IV subserrate, V–XI pectinate; antennomere II 2.8–3.8× as long as antennomere XI; antennomere VII 4.4–5.6× wider that long; antenna extending slightly beyond humerus. Prothorax: Subconical, without lateral carina; densely foveolate, disc convex, slightly gibbous before scutellum and with shallow median channel; prosternal process narrow, triangular, acute, half as long as procoxae. Meso- and metathorax: Scutellum square, bidentate apically; elytral striae regular, striae 4 and 5 abbreviated basally by tubercle, humeri raised. Legs: First protarsomere 2.0–3.0× as long as second, first mesotarsomere 1.8–2.3× as long as second, first metatarsomere 2.6–3.0× as long as second; metacoxa densely punctate; hind femur constricted basally and apically, expanded medially to about width of coxa; without external carina ventrally; internal ventral carina with small subapical acuminate spine about half as long as width of tibial base; hind tibia straight, enlarged, with only mesal and ventral carinae; tibial corona with 4 spinules, mucro 0.10–0.13× as long as first tarsomere; without sinus at base of spine; first hind tarsomere with ventrolateral glabrous longitudinal carina. Abdomen: Pygidium vertical (Fig. 2); last sternite emarginate. Genitalia: Median lobe moderately long, ventral valve triangular and deeply arcuate, internal sac with many small spines or needles, without large sclerites (Fig. 3a); lateral lobes elongate, expanded at apex, cleft about 0.53 their length; basal strut an obsolete perpendicular keel (Fig. 3b). Female (Fig. 4a–b). Length (pronotum-elytra) 2.4–2.8 mm, width: 1.5–1.7 mm, Maximum thoracic depth 1.6–1.8 mm. Similar to male except antennae serrate; distance between eyes 1.8.–2.0× as wide as eye width; pygidium subvertical; last sternite not emarginate.

Figure 1. 

Male habitus of Decellebruchus atrolineatus; a dorsal view b lateral view.

Figure 2. 

Male pygidium of Decellebruchus atrolineatus.

Figure 3. 

Male genitalia of Decellebruchus atrolineatus; a median lobe b lateral lobes.

Figure 4. 

Female habitus of Decellebruchus atrolineatus; a dorsal view b lateral view.

NAMIBIA: Rundu, 28/V/2015, T. Chauke, 17°55’S 19°46’E, reared seed Glycine max (L.), intercepted at Pretoria SAAFQIS Plant Quarantine Station, South Africa, Sample Pta. 2811 (1 ex SANC). Caprivi region, 2002, intercepted at Pretoria SAAFQIS Plant Quarantine Station, South Africa (70 ex SANC). AFRICA: Intercepted at USA, 36/XII/2003, reared seed Phaseolus sp. (3 ex, FSCA); Intercepted at Atlanta, USA, 10/IX/2006, reared seed Phaseolus vulgaris L. (1 ex., FSCA). DEMOCRATIC REPUBLIC OF THE CONGO: N of Shaba Province, 28/III/1980, Whitecomb W.H., in cowpeas (1 ex., FSCA). NIGERIA: Intercepted at USA, 2/II/2004, Phaseolus sp. (7 ex., FSCA); Intercepted at USA, 3/II/2004, reared seed Phaseolus sp. (2 ex., CEAM). MEXICO: Ocolome, El Fuerte, Sinaloa, 21/I/2013, Lugo G.G.A., reared seed Vigna unguiculata (L.) WALP. (190 ex., CEAM).

Dolichos lablab L., Glycine max (L.), Phaseolus vulgaris L. Vigna unguiculata (L.) Walp., Vigna unguiculata subsp. stenophylla (Harv.) Maréchal & Al., Vigna unguiculata subsp. unguiculata (L.)Walp. (Fabaceae). Zacher (1952) stated that Lablab niger Medik. and Medicago sativa L. are plant hosts of D. atrolineatus, however this information must be corroborated.

Algeria, Angola, Brazil, Burkina Faso, Cameroon, Central African Republic, Democratic Republic of the Congo, Egypt, Ethiopia, Gambia, Ghana, Jamaica, Kenya, Liberia, Mali, Mexico, Mozambique, Namibia, Niger, Nigeria, South Africa, Saudi Arabia, Senegal, Sudan, Tanzania, Uganda, United Kingdom, Yemen, Zanzibar.

Decellebruchus atrolineatus has high economic importance, because it is a pest mainly in species in the genus Vigna. It is frequently found together with Callosobruchus maculatus (F.). Large losses due to this insect are reported frequently in some countries of Africa, where those bruchids are endemic (Booker 1967, Germain et al. 1987, Ofuya and Credland 1996, Sanon et al. 2005).

Holotype male, allotype female and two paratypes: M. Elgon, Kenya, 20/I/1979, 1900 m, Palm T. (MZLU), one paratype same data, except 22/I/1979, 2010 m (MZLU). One paratype: Kingsburg beach, Natal, South Africa, 10/IV/1992, O’Brien C.W., L.B. O’Brien & G. Marshall (CEAM).

Male (Fig. 5a–b). Length (pronotum-elytra): 2.0–2.13 mm; width: 1.13–1.25 mm; maximum thoracic depth 1.1–1.2 mm. Color: Antennae with first four segments and apex of last one yellowish, the rest dark or partially dark; body dark, except fore legs, middle legs, elytra, tibiae and tarsi of posterior legs yellowish; however, some specimens may vary from all body yellowish to dark. Vestiture: Body with mixed black, yellowish, and white pubescence; fore coxa with a tuft of white setae; pygidium with basal central spot of white pubescence. Head: Short and broad, densely micropunctulate, frons with a strong median carina, distance between eyes 1.95–2.8× as wide as eye width, eye cleft 0.60–0.71× its length by ocular sinus, posterior margin of eye protruding from adjacent surfaces, postocular lobe rounded and setose; distance from base of antennae to apex of labrum 0.45–0.53× as long as distance from upper limits of eyes to apex of labrum; antennomeres I–III filiform, IV subserrate, V–XI pectinate; antennomere II 2–2.0× as long as antennomere 11; antennomere VII 1.76–2.0× wider that long; antenna extending to mid body. Prothorax: Subconical, without lateral carina; densely foveolate, disc convex, indistinctly gibbous before scutellum and without shallow median channel; prosternal process narrow, triangular, acute, half as long as procoxae. Meso- and metathorax: Scutellum square, bidentate apically; elytra with strial punctures wider than the stria, striae 4 and 5 abbreviated basally by tubercle, humeri slightly raised. Legs: First protarsomere 1.33–1.79× as long as second, first mesotarsomere 2.0–2.1× as long as second, first metatarsomere 2.6–3.2× as long as second; metacoxa densely punctate; hind femur constricted basally and apically, expanded medially to about width of coxa; without external carina ventrally; internal ventral carina with subapical acuminate spine about as long as width of tibial base; hind tibia straight, enlarged, with complete set of carinae; tibial corona with one spinule, the others obsolete, mucro 0.18–0.24× as long as first tarsomere; without sinus at base of spine; first hind tarsomere with ventrolateral glabrous longitudinal carina. Abdomen: Pygidium vertical (Fig. 6); last sternite emarginate. Genitalia: Median lobe moderately long, ventral valve triangular and deeply arcuate, internal sac lined with many small spines, basal portion with a dentiform sclerite and a small spinules forming a triangle (Fig. 7a); lateral lobes elongate, expanded at apex, cleft about 0.73 their length; basal strut with a strong perpendicular keel (Fig. 7b). Female (Fig. 8a–b). Length (pronotum-elytra) 1.85–2.05 mm, width: 1.12–1.3 mm, Maximum thoracic depth 0.95–1.41 mm. Similar to male except antennae serrate; pygidium subvertical; last sternite not marginate.

Figure 5. 

Male habitus of Decellebruchus lunae; a dorsal view b lateral view.

Figure 6. 

Male pygidium of Decellebruchus lunae.

Figure 7. 

Male genitalia of Decellebruchus lunae; a median lobe b lateral lobes.

Figure 8. 

Female habitus of Decellebruchus lunae; a dorsal view b lateral view.

Unknown.

Kenya and South Africa.

The specific epithet honors the grandaughter of the author, Luna Nereida Nila Romero.

This species is included in the genus Decellebruchus because it presents all characters indicated in the diagnosis of the genus; also it can be separated from the other two species in the genus because the typical male pygidium, less strongly male antennae, unique armature of the internal sac of male genitalia, and lateral lobes of which bear a basal strut with a strong perpendicular keel.

Male (Fig. 9a–b). Length (pronotum-elytra): 1.77–2.1 mm; width: 1.27–1.37 mm; maximum thoracic depth 1.07–1.32 mm. Color: Antennae with the first five segments and apex of the last one yellowish, the rest dark or partially dark; body dark, except fore legs, middle legs, part of elytra, and ventral portion of femora; however some specimens may vary from all body yellowish to dark. Vestiture: Body with mixed black, yellowish, and white pubescence; fore coxa with a tuft of white setae; pygidium with three basal spots of white pubescence, the lateral ones bigger than median. Head: Short and broad, densely micropunctulate, frons with a strong median carina, distance between eyes 1.53–3.3× as wide as eye width, eye cleft 0.57–0.8× its length by ocular sinus, posterior margin of eye protruding from adjacent surfaces, postocular lobe rounded and setose; distance from base of antennae to apex of labrum 0.38–0.47× as long as distance from upper limits of eyes to apex of labrum; antennomeres I–III filiform, IV subserrate, V–XI pectinate; antennomere II 2–2.0× as long as antennomere 11; antennomere VII 4.75–6.67× wider that long; antenna extending to mid body. Prothorax: Subconical, without lateral carina; densely foveolate, disc convex, lightly gibbous before scutellum and without shallow median channel; prosternal process narrow, triangular, acute, half as long as procoxa. Meso- and metathorax: Scutellum square, bidentate apically; elytra with striael punctures as wide as the stria, striae 4 and 5 abbreviated basally by tubercle, humeri slightly raised. Legs: First protarsomere 1.45–1.7× as long as second, first mesotarsomere 1.92–2.6× as long as second, first metatarsomere 2.86–3.4× as long as second; metacoxa densely punctate; hind femur constricted basally and apically, expanded medially to about width of metacoxa; without external carina ventrally; internal ventral carina with subapical acuminate spine about as long as width of tibial base, followed by 2 smaller spines; hind tibia straight, enlarged, with complete set of carinae; tibial corona with 4 spinules, mucro 0.11–0.16× as long as first tarsomere; without sinus at base of spine; first hind tarsomere with ventrolateral glabrous longitudinal carina. Abdomen: Pygidium vertical (Fig. 10); last sternite emarginate. Genitalia: Median lobe moderately long, ventral valve triangular and deeply arcuate, internal sac lined with many small spines, basal portion with a small spinules forming a triangle (Fig. 11a); lateral lobes elongate, expanded at apex, cleft about 0.66 their length; basal strut with small perpendicular keel (Fig. 11b). Female (Fig. 12a–b). Length (pronotum-elytra) 1.95–2.8 mm, width: 1.25–1.8 mm, Maximum thoracic depth 1.12 mm. Similar to male except antennae serrate; pygidium subvertical; last sternite not marginate.

Figure 9. 

Male habitus of Decellebruchus walkeri; a dorsal view b lateral view.

Figure 10. 

Male pygidium of Decellebruchus walkeri.

Figure 11. 

Male genitalia of Decellebruchus walkeri; a median lobe b lateral lobes.

Figure 12. 

Female habitus of Decellebruchus walkeri; a dorsal view b lateral view.

INDIA: Maharashtra, Lonavla, 28/IV/2000, 650 m, Pacholatko P. (1 ex., CEAM). KENYA: M. Elgon, 24/I/1979, 1950 m, Palm T. (1 ex., MZLU). SRI LANKA: Vayiriuttu, 5 mi W Trincomalee, Estern Prov., 9/II/1962, Lund University Ceylon Expedition, sweeping at teak plantation (1 ex., MZLU); Kuda Oya, 15 mi S Wellawaya, Uva Prov., 22/III/1962, Brinck, Andersson & Cederholm (2 ex., MZLU); Yakkala, 18 mi NE Colombo Western Prov., 26/III/1926, Brinck, Andersson & Cederholm, swept on vegetation at ditches in paddy fields (1 ex., MZLU).

Unknown.

India, Kenya, Sri Lanka, Thailand.

There is little information about this species. At this time its host plants are unknown and only a few specimens were available for study; three of which were still named Bruchidius walkeri.