Pelecinobaccha aster ( Curran, 1941 ) Curran, 1941

Miranda, Gil Felipe Gonçalves, Marshall, Stephen A. & Skevington, Jeffrey H., 2014, Revision of the genus Pelecinobaccha Shannon, description of Relictanum gen. nov., and redescription of Atylobaccha flukiella (Curran, 1941) (Diptera: Syrphidae), Zootaxa 3819 (1), pp. 1-154 : 24-25

Pelecinobaccha aster ( Curran, 1941) comb. nov.

Map 4. Figure 3 .

Baccha aster Curran, 1941 .— Curran, 1941: 278. Type locality: Brazil, Santa Catarina, Nova Teutônia. Holotype male AMNH. Hull, 1949a: 200 (fig. 41, male abdomen, mislabeled as female), 232 (fig. 187, male abdomen), 238 (fig. 216, female abdomen).

Ocyptamus aster . Thompson et al., 1976: 13 (catalog citation).

Male. Head: Dark brown. Face pale with a medial dark brown vitta that is narrow ventral to tubercle and expands to ⅓ of the face width dorsally. Lunule pale, with teardrop-shaped black macula medially, connected to frons color by median black vitta. Frontal triangle dark, pale laterally except around eye contiguity, dull brown-pollinose medially and with very sparse white pollen dorso-laterally; frontal prominence only slightly protuberant. Vertical triangle with a median row of black pile; ocellar triangle separated by its length from posterior eye margin. Eye contiguity longer than vertical triangle length. Eye with posterior indentation at level of antennal insertion. Antennal insertions confluent. Occiput with dull pollen on dorsal ¼ and concentrated white pollen on ventral ¾. Dorsal ¼ of occiput with 1–2 rows of simple black pile, anterior row with short pile, posterior row sometimes with white pile; ventral ¾ with 2–3 rows of white scale-like pile, anterior rows shorter.

Thorax: Scutum dark brown, dull brown-pollinose, with white pollen forming a weak pair of sub-median vittae on anterior ⅔. Scutum mostly covered by black pile but with white pile laterally and with shining white pile in an anterior row, the latter interrupted medially. Scutellum dark brown, white pilose, subscutellar fringe pile long and white. Pleuron mostly black, white on posterior ½ of posterior anepisternum and dorso-posterior region of katepisternum; entirely white pilose, most pile appressed. Plumula very short and white. Calypter white to yellow. Halter yellow, capitulum sometimes orange.

Wing: Light brown, entirely microtrichose, cu p cell narrow; alula inconspicuous, 1/5 of c cell width, bare.

Legs: Procoxa, protrochanter, apical ½ of profemur, apical ⅓ protibia, apical ¾ of probasitarsomeres and 4th to 5th protarsomeres brown; foreleg otherwise pale, mostly white pilose. Mesocoxa, mesofemur on subapical ¼, apical ⅓ of mesotibia, mesobasitarsomere and the 2 apical mesotarsomeres brown; midleg otherwise pale, mostly black pilose but posterior row of mesofemur with white and black pile intermixed. Metaleg brown except base and apex of metafemur, base of metatibia, apex of metabasitarsomere until 4th metatarsomere pale; pile on metacoxa and metatrochanters mostly white.

Abdomen: Dark brown, ~5.5 times as long as thorax. First tergite pale laterally; entirely white pilose, pile longer laterally. Second tergite very long, length ~13 times minimum width, with pair of subapical lateral pale spots; dull black-pollinose dorsally and laterally immediately posterior to pale maculae; pile short, appressed and black. Third tergite trapezoidal and long, length ~12 times minimum width, with sub-median lateral oval pale maculae; with narrow central triangular region of dull black pollen; pile appressed and black. Fourth tergite rectangular, ~2.5 times as long as wide, with large, baso-lateral, quadrate, pale maculae; dull black-pollinose except on pale maculae; remaining characteristics as on 3rd. Fifth tergite sub-quadrate, without pale maculae, dull black-pollinose medially, remaining characteristics as on 3rd. Genitalia: Cercus with 1 regular row of pile on medial margin and 2–3 regular rows on lateral margin. Surstylus oval, directed apicoventrally and with ventral setulae mostly concentrated on apical ¼ and a few in a sub-median row; surstylus dorsal surface pilose. Subepandrial sclerite rectangular and wide with short baso-lateral extensions, homogeneously sclerotized. Hypandrium with rounded ventral notch on anterior ½. Phallapodeme enlarged basally, homogenously sclerotized except for base. Basiphallus with blunt and short posterior projection; distiphallus with straight apex. Postgonite with ventral and dorsal surfaces mostly straight, apex convex anteriorly, with enlarged rounded ventral extremity and very short acute dorsal extremity.

Female: Like male except: Face vitta narrower. Frons black with pale lateral margin on ventral ⅓, with a shining medial vitta, lateral white pollinosity more distinct. Ocellar triangle ~1.5 times its length from posterior eye margin and ~1 ocellus-width from lateral eye margin. Wing more hyaline. Apical ¼ of mesotibia brown and mesobasitarsomere entirely pale. Second abdominal tergite length 10 times minimum width. Third tergite length 6.5 times minimum width. Fourth tergite maculae smaller to absent. Fifth tergite sub-quadrate. Sixth segment rectangular, slightly longer than wide, divided into tergite and sternite. Genitalia: 7th tergite with long anterior acute projection; 7th segment lateral sclerite slightly oval, acute baso-ventrally, with more extensive fused basal area to 7th tergite; 7th segment weakly sclerotized ventrally forming a posterior long acute projection medially. Eighth tergite unsclerotized medially, basal crest weak; 8th sternite unsclerotized medially. Tenth tergite reduced to a pair of sclerites fused to dorsal surface of the cerci. Cercus narrowed and curved basally, forming an acute basoventral projection, with 1 row of pile on apical margin.

Length. 11.5–14.5mm; wing 8–9.5mm.

Distribution. Brazil (Santa Catarina).

Material examined. BRAZIL. Santa Catarina, Nova Teutônia, 300–500m, 27°11'S 52°23'W, 20 Oct 1939, F. Plaumann (1 ♀, Allotype Baccha aster , AMNH); …, Baccha aster Curran Holotype ♀ [red label], 21 Oct 1939 (1 ♂, Holotype Baccha aster , AMNH); ..., Oct– May 1939, 1948, 1966, 1969 & 1971, F. Plaumann (6 ♂, CNC Diptera 161284 –8, 4 ♀, CNC Diptera 161289 –91 & AMNH).

Figures

FIGURE 3. Pelecinobaccha aster (Curran, 1941). a – d. Female genitalia: a. 7 th tergite, dorsal. b. Apex, dorsal. c. 7 th segment, lateral. d. Apex, lateral. e – h. Male genitalia: e. Epandrium, lateral. f. Epandrium, ventral. g. Hypandrium, lateral. h. Hypandrium, ventral. i. Holotype, habitus, dorsal (copyright AMNH). 8 tg: 8 th tergite, 10 tg: 10 th tergite, cerc: cercus, s scl: subepandrial sclerite.