Brachiacantha bilineata Weise

Gordon, Robert D., Canepari, Claudio & Hanley, Guy A., 2014, South American Coccinellidae (Coleoptera), Part XVI: systematic revision of Brachiacantha Dejean (Coccinellinae: Hyperaspidini), Insecta Mundi 2014 (390), pp. 1-76 : 54-55

46. Brachiacantha bilineata Weise

Brachyacantha bilineata Weise, 1902: 170 ; Leng 1911: 295; Korschefsky 1931: 203; Blackwelder 1945: 449.

Description. Female lectotype. Length 3.5 mm, width 2.6 mm; body slightly elongate, convex. Dorsal surface with head and pronotum alutaceous, dull, elytron smooth, shiny. Color black except head with anterolateral clypeal angle narrowly brown, vertex and narrow strip along eye dark brown; pronotum yellow with black, basomedian area extended laterally along base, extended anteriorly nearly to apical pronotal margin, roundly excised by yellow area laterally; scutellum black; elytron yellow with base, sutural and lateral margins narrowly black, narrow black vitta extended posteriorly from base across humeral callus to apical 1/3 of elytron ( Fig. 259 ), ventral surface with mouthparts and legs yellow ( Fig. 259 ). Head punctures large, separated by a diameter or less, each puncture as large as 2 eye facets; pronotal punctures large than head punctures, separated by less than to twice a diameter; elytral punctures larger than on pronotum, separated by less than to 3 times a diameter. Clypeus weakly emarginate apically, lateral angle abruptly rounded, surface with sparse, long pubescence. Eye canthus about 6 eye facets long, slightly angled forward, carinate dorsally, abruptly rounded apically, dark brown. Pronotum narrowed from base to apex, sides nearly straight, basal and anterior angles abruptly rounded, basal margin without bordering line. Epipleuron narrow, grooved, deeply emarginate for reception of femoral apices. Protibia with flange wide, about as wide as remainder of protibia, outer margin slightly arcuate, smooth, basal tooth large, length about 2/3 width of protibia at base, sponda extended beyond protibial flange. Carinae on prosternal process parallel nearly to apex, apex not examined. Metaventrite without setal tuft. Basal abdominal ventrite without median setal tuft. Basal abdominal ventrite with postcoxal line on basal abdominal ventrite rounded to apical margin of ventrite at middle, flattened along margin, then angled forward at apex; ventrites 1–4 with sparse, long pubescence, punctures sparse medially, becoming dense laterally; pubescence becoming dense on sterna 5, 6. Genitalia not examined.

Male. Unknown.

Variation. Unknown.

Type locality. Bolivia.

Type depository. ZMHB (lectotype here designated).

Geographical distribution. Bolivia (only the lectotype specimen seen).

Specimens examined. Bolivia. “Bolivia.” ( ZMHB).

Remarks. The dorsal color pattern is extremely distinctive, no other species as yet examined is remotely similar. The lectotype was glued together at some time in its history, so it was not dissected in order to prevent complete disintegration of the specimen.

The female lectotype is labeled “ Bolivia (second word illegible) (green paper, handwritten)/ Bolivia (handwritten)/ Brachyacantha bilineata m. (handwritten).” This specimen may be the only one Weise had, but that cannot be determined from the original description. Therefore it is designated as the lectotype.

Figures

Figures 259–265. 259. Brachiacantha bilineata. 259) Habitus. 260–262. Brachiacantha egae. 260) Habitus. 261) Protibia. 262) Female genitalia. 263–264. Brachiacantha sicardi. 263) Habitus. 264) Female genitalia. 265. Brachiacantha steiner. 265) Habitus.