Pelecinobaccha wyatti

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 : 84-85

Pelecinobaccha wyatti Miranda sp. nov.

Map 8. Figure 41 (f–j).

Type locality. Peru, Junín, Chanchamayo, 1000m, 11°12'S 75°35'W. Holotype male CNC.

Male. Head: Black. Face pale on lateral ⅓. Lunule pale above antennal insertions and around central black macula, macula disconnected from frontal triangle color. Frontal triangle with a pair of oval spots of silvery-white pollen centro-laterally, dull brown-pollinose medially. Vertical triangle with a single median row of pile; ocellar triangle ~1.5 times its length from posterior eye margin. Eye contiguity slightly shorter than vertical triangle length. Eye with posterior indentation at level of antennal insertions. Antennal insertions almost separated, ventral margin dorsal extension unsclerotized dorsally before reaching lunule. Dorsal ⅓ of occiput with 2 regular rows of simple black pile, anterior row shorter; middle ⅓ with 3–4 rows of scale-like white pile, anterior rows shorter, with some simple black pile dorsally; ventral ⅓ with 2 irregular rows of scale-like white pile.

Thorax: Scutum black, mostly covered by dull brown pollen, except white on notopleuron; scutum with short erect black pile, except pile longer on notopleuron and white anterior to transverse suture, and with anterior row of shining white pile interrupted in the middle. Scutellum dark brown, pile short and black, subscutellar fringe pile long and white. Pleuron white pilose and dark brown to black, pale on posterior ½ of posterior anepisternum and dorso-posterior katepisternum. Plumula long, light brown to white. Calypter light yellow, margin and pile light brown. Halter light brown.

Wing: Apical ½, anal lobe and posterior margin of cu p cell hyaline, otherwise dark (bc, c, sc, r, basal 3/5 of r1, basal ⅓ of r2+3, base of r4+5, bm, basal ¼ of dm, anterior margin and apex of cu p and basal ½ of cua1), entirely microtrichose; alula anterior ½ light brown, otherwise hyaline, large, basally 2 times to basally 4 times basally as broad as c cell, entirely microtrichose.

Legs: Pro- and mesoleg dark brown, femora with apex pale, mesotibia with basal ⅔ slightly lightened. Metaleg dark brown, metafemur slightly dark red on basal ½, apical ½ of metabasitarsomere and other metatarsomeres white.

Abdomen: Dark brown; ~3 times as long as scutum. First tergite white pilose. Second tergite long, length ~4.5 times minimum width, pale laterally; 2nd tergite with central elongated triangular region of dull black pollen, and mainly with appressed and black pile, except erect and white on baso-lateral ¾. Third tergite trapezoidal and long, length ~3 times minimum width, pale on baso-lateral ½; 3rd tergite with large central triangle of dull black pollen, and with appressed and black pile, except for some white pile on baso-lateral corners. Fourth tergite sub-quadrate, slightly wider than long, with very weak pair of central short pale vittae; remaining characteristics as on 3rd. Fifth tergite rectangular and wide; dull black pollen restricted to three central vittae, and all with appressed and black pile. Genitalia: Cercus with 1–2 rows of pile on medial margin and 2 rows on lateral margin. Surstylus long with oval apex, directed apically, pilose dorsally on basal ¾, with setulae (around 10) ventro-apically, mostly concentrated on margin. Subepandrial sclerite trapezoidal and short, lateral margin strongly sclerotized. Hypandrium narrow and long, dorsal arc surface not greatly elongated, with ventral notch extending to anterior 3/5. Phallapodeme long, well sclerotized throughout, curved ventrally on basal ⅓. Basiphallus with short narrow posterior extremity; distiphallus with anterior surface straight, apex slightly curved apically. Postgonite pilose on ventro-basal ⅔, ventral margin of medial surface concave, lateral surface slightly convex, dorsal margin straight, apex convex, ventral extremity rounded, dorsal extremity acute.

Female: Female unknown.

Length. 14.5mm; wing 11.5mm.

Distribution. Peru (Junín).

Primary type. Holotype: Male in good condition with left proleg and genitalia dissected and placed in individual plastic tubes pinned with the specimen. Holotype labels: ‘Chanchamayo // Peru Feb. 24 ’41 // J.Schunke 1000 // m.’ [handwritten] ‘Frank M. Hull // Collection // C.N.C. 1973’ ‘CNC Diptera // # 161221 ’ ‘ Holotype // Pelecinobaccha // wyatti // Miranda’ [red label].

Comments. Close to P. eruptova and P. telescopica , but the antennal insertions are almost separated by a medial sclerotized stripe and the male genitalia are distinct.

Etymology. The specific epithet is a patronym honouring Nigel Wyatt, Diptera curator at the BMNH. It should be treated as a noun in the genitive case.

Figures

FIGURE 41. a – e. Pelecinobaccha unica sp. nov., holotype: a – d. Male genitalia: a. Epandrium, lateral. b. Epandrium, ventral. c. Hypandrium, lateral. d. Hypandrium, ventral. e. Habitus, dorsal. f – j. Pelecinobaccha wyatti sp. nov., holotype: f – i. Male genitalia: f. Epandrium, lateral. g. Epandrium, ventral. h. Hypandrium, lateral. i. Hypandrium, ventral. j. Habitus, dorsal. s scl: subepandrial sclerite.