Pelecinobaccha vesca

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 : 82-83

Pelecinobaccha vesca Miranda sp. nov.

Map 5. Figure 9 .

Type locality. Peru, Cuzco, Quincemil, 13°13.048'S 70°44.458'W. Holotype female CNC.

Male. Head: Shining black. 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 above antennal insertions but not greatly extended. Frontal triangle shiny, pale laterally until eye contiguity, if white pollen present, then very sparse, antennal base prominence distinctly protuberant. Vertical triangle with 1 row of black pile; ocellar triangle separated by its length from posterior eye margin. Eye contiguity slightly longer than vertical triangle length. Eye with posterior indentation ventral to the antennal insertion. Antennal insertions confluent, ventral margin has a short dorsal extension. Dorsal ¼ of occiput dull black, otherwise occiput homogenously covered by white pollen; dorsal ¼ of occiput with 2 rows of simple black pile, anterior row with shorter pile, middle 2⁄4 with 2–3 rows of white, scalelike pile, anterior rows shorter; ventral ¼ with 2 rows of white, scale-like pile, but pile thinner than that of the middle.

Thorax: Scutum shining black, brown-pollinose in a small anterior area and with short black pile, without distinct anterior row. Scutellum shining black, with very short black pile, subscutellar fringe absent. Pleuron black, pale on posterior margin of posterior anepisternum and dorso-posterior katepisternum; pleuron mostly with very short, appressed, sparse, white pile, except anterior anepisternum with longer, erect and black pile, and metepisternum with inconspicuous pile; katatergite mostly with long microtricosity, except in a medial triangular area. Plumula absent. Calypter white, with very short pile on fringes, ventral lobe narrow. Halter yellow, capitulum orange. Metaepimera extended dorso-posteriorly to metacoxa, and with apices approximated.

Wing: Light brown, bare on cell bc, basal 1/5 of c, base of r, basal 1/6 of bm and basal 2/5 of cu p, cu p cell narrow; alula absent.

Legs: Proleg mostly pale, procoxa, apical ½ of profemur and apical ⅓ of protibia light brown, protarsomeres brown except pale on apex of probasitarsomeres and 2nd protarsomeres; black pilose. Mesoleg pale, mesocoxa, apical ⅓ of mesofemur (except for apex), apical ⅓ to ¼ of mesotibia, mesobasitarsomere and 4th to 5th mesotarsomeres brown; black pilose. Metaleg dark brown, metatrochanters, base and apex of metafemur, basal 1/6 of metatibia pale, basal ½ of metafemur sometimes light brown; black pilose, metacoxa mainly white pilose.

Abdomen: Shining black; ~6.5 times as long as thorax; tergites with black dull pollinosity medially, whole abdomen with short, appressed, black pile. First tergite pale on lateral extremities; mostly bare, but with sparse short white pile laterally, some dorsal pile black. Second tergite very long and narrow, length ~15 times minimum width, with pair of subapical lateral pale fasciate maculae; pile sparse. Third tergite very long and narrow, slightly expanding towards apex, length ~14 times minimum width, with lateral pair of fasciate pale maculae medially. Fourth tergite trapezoidal and long, length ~5 times minimum width, with lateral basal pair of pale rectangular maculae. Fifth tergite rectangular and wide. Genitalia: Cercus with 2 rows of pile on medial margin and 3 rows on lateral margin. Surstylus oval with medial curved fold on basal ⅔, directed ventrally, with setulae ventrally, restricted to apex (around 12) and 1 setulae medially, with pile medially on the dorsal surface. Subepandrial sclerite rectangular and wide with small baso-lateral projections. Hypandrium oval on basal ½, slightly wider and quadrate on apical ½, with ventral triangular notch on anterior ⅔. Phallapodeme ½ the size of the hypandrium, mostly weakly sclerotized, apex and apico-dorsal ⅔ well sclerotized. Basiphallus with blunt posterior extremity; distiphallus with anterior surface curved anteriorly. Postgonite with ventral surface straight, dorsal surface slightly concave; postgonite apex convex, with acute dorsal extremity and, slightly extended, sub-acute ventral extremity.

Female: Like male except: Frons normal width, pale on baso-lateral ½, bare medially, pile mostly white, pile around antennal base white; pile short. Ocellar triangle ~2 times its length from posterior eye margin and ~1 ocellus-width from lateral eye margin. Eye with posterior indentation dorsal to level of antennal insertions. Posterior anepisternum with posterior ½ pale; anterior anepisternum pile white, bare area on katatergite smaller.

Wing hyaline, apex light brown, bare on bc cell, basal ⅔ of c, base of r, basal ⅓ of bm and basal ½ of cu p. Pro and mesoleg white pilose. Protibia mostly pale, 3rd protarsomeres light brown. Mesofemur with apical ¼ brown, mesotibia mostly pale, mesobasitarsomere with apex pale. Basal ⅓ of metatibia, apex of metabasitarsomere, 2nd and 3rd metatarsomeres pale. Abdominal maculae almost meet dorsally. Fifth tergite sub-quadrate. Sixth segment divided into tergite and sternite. Genitalia: 7th tergite with acute anterior margin; 7th segment lateral sclerite triangular. Eighth tergite unsclerotized medially, apex with a pair of acute extremities, basal crest short and weak; 8th sternite unsclerotized medially. Tenth tergite fused to dorsal margin of cerci. Cercus with a baso-ventral, short, curved, acute projection, with 1 row of pile on apical margin.

Length. ~ 12.5mm; wing ~ 8mm.

Distribution. Peru (Cuzco), Venezuela (Carabobo).

Primary type. Holotype: Female in good condition. Holotype labels: ‘Quincemil // Cuzco, PERU // 13–31.VIII. ’62 // L. Pena. 780m. ’ ‘CNC Diptera # 161201 ’ ‘ Holotype // Pelecinobaccha // vesca // Miranda’ [red label].

Paratypes. PERU. Cuzco, Quincemil, 13–31 Aug 1962, L. Pena (4 ♂, CNC Diptera 161197 –200, 2 ♀, CNC Diptera 161202, 161402). VENEZUELA. Carabobo, Henri Pitier National Park, Portachuelo Pass, 1143m, 10°20'51''N 67°41'16''W 15 Sep 2008, J. H. Skevington (1 ♂, JSS25216).

Comments. Like P. invisibilis , these flies are very similar to species of the Ocyptamus stenogaster group, but P. vesca has a smooth frons/frontal triangle and the typical modified female genitalia of Pelecinobaccha .

This species corresponds to sp 27 in the cladograms of Miranda (2011).

Etymology. The specific epithet is an adjective for ‘thin’.

Figures

FIGURE 9. Pelecinobaccha vesca sp. nov. a – d. Holotype, female genitalia: a. 7 th tergite, dorsal. b. 8 th tergite, 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. 8 tg: 8 th tergite, 10 tg: 10 th tergite, cerc: cercus, s scl: subepandrial sclerite.