Decellebruchus walkeri (Pic, 1912)

Napoles, Jesus Romero, 2016, Systematics of the seed beetle genus Decellebruchus Borowiec, 1987 (Coleoptera, Bruchidae), ZooKeys 579, pp. 59-81 : 67-68

Taxon classification Animalia Coleoptera Bruchidae

Decellebruchus walkeri (Pic, 1912)

Bruchus figuratus Walker, 1859: 261 (homonymy); Pic 1913: 57; Decelle 1975b: 184; Vazirani 1975: 746; Decelle 1985: 75.

Bruchus walkeri Pic, 1912: 92 (replacement name), 1913: 57; Decelle 1975b: 184; Vazirani 1975: 746; Decelle 1985: 76.

Bruchidius walkeri : Decelle 1975b: 184; Decelle 1985: 75.

Spermophagus figuratus : Motschulsky 1863: 519; Decelle 1975b: 185;

Description.

Male (Fig. 9 a–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 lon gitudinal 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. 12 a–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.

Material examined.

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).

Host plant.

Unknown.

Distribution.

India, Kenya, Sri Lanka, Thailand.

Discussion.

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 .