Pelecinobaccha morgani

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 : 56-57

Pelecinobaccha morgani Miranda sp. nov.

Map 8. Figure 34 (a–e).

Type locality. Bolivia, Beni, Rurrenabaque, 14°26'S 67°31'W. Holotype male CNC.

Male. Head: Dark brown to black. Face sometimes pale on lateral ¼. Lunule sometimes pale above antenna insertion, usually light brown around the central black macula, separating it from the frontal triangle color. Frontal triangle with pair of oval spots of silvery-white pollen centro-laterally and dull dark pollen medially. Vertical triangle with only 1 median row of pile; ocellar triangle separated by its length from posterior eye margin. Eye contiguity slightly longer than vertical triangle length. Eye with posterior indentation at level antennal insertion. Antennal insertions confluent, ventral margin with short dorsal extension. Dorsal ¼ of occiput with 2 regular rows of simple black pile, anterior row shorter; middle ½ with a regular posterior row of very long scale-like white pile and 2 regular anterior rows of simple long black pile, some pile scale-like and white ventrally; ventral ¼ with 2–3 irregular rows of scale-like white pile.

Thorax: Scutum dark brown to black, mainly dull pollinose, except white on notopleuron, and sometimes with a pair of sub-median short tapering vittae of pale pollen; scutum black pilose, except notopleuron sometimes with white pile anteriorly, with longer pile on notopleuron, anterior to transverse suture, and slightly longer pile anterior to scutellum; scutum anterior row of long shining white pile interrupted in the middle. Scutellum dark brown to black, pile long and black, subscutellar fringe pile long and black. Pleuron white pilose and black. Plumula long and white. Calypter yellow. Halter stem light brown, capitulum yellow to light orange.

Wing: Mostly dark, apical ¼ and posterior margin slightly dark (dark on cells bc, c, sc, r, basal ¾ of r1, basal ⅔ of r2+3, basal ½ to 3/5 of r4+5, bm, most of dm, cu p and most of cua1), entirely microtrichose; alula slightly dark, large, basally 1.9 times to apically 3.75 times as broad as c cell, entirely microtrichose.

Legs: Dark brown to black. Apex of profemur and base of protibia pale. Apex of mesofemur and base to basal ¼ of mesotibia pale. Apex of metafemur pale, apical 1/5 of metabasitarsomere until 4th metatarsomere pale; metacoxa sometimes with a few white pile dorsally.

Abdomen: Dark brown to black; ~2.5 times as long as thorax. First tergite white pilose. Second tergite long, length ~2.5 times minimum width, with central triangular region of dull black pollen; 2nd tergite mainly with appressed pile, except long and erect basally and laterally, pile mainly black except white basally and on basolateral ⅔. Third tergite trapezoidal, length ~2 times minimum width, and with large central triangular macula of dull black pollen; 3rd tergite with appressed black pile, except erect, white slightly longer on baso-lateral corners; 3rd sternite rectangular and long. Fourth tergite sub-quadrate; with median dull black pollinose large arcuate fascia, and pile black and appressed. Fifth tergite rectangular and wide, with dull black pollen mediallyand black and appressed pile. Genitalia: Surstylus directed obliquely apicoventrally, sub-oval in lateral view, with setulae (around 13) ventrally on apical ⅓, sparsely pilose on dorsal surface. Subepandrial sclerite rectangular and wide, slightly concave on anterior margin and with a small notch on posterior margin. Hypandrium with notch extending to anterior ⅔. Phallapodeme heavily sclerotized basally. Distiphallus with anterior surface straight, apex curved apically. Postgonite sparsely pilose ventrally, ventral surface almost straight, dorsal surface concave medially; postgonite apex rounded ventrally, convex anteriorly and with acute dorsal extremity.

Female: Female unknown.

Length. ~ 8mm; wing 6–6.5mm.

Distribution. Bolivia (Beni), Brazil (Mato Grosso, São Paulo), Peru (Madre de Dios).

Primary type. Holotype: Male in good condition, except the abdomen is separated from the thorax at the base of the 1st abdominal tergite and is hanging slightly sideways, connected to the thorax by dried tissue. Specimen with left proleg and genitalia dissected and placed in individual plastic tubes pinned with the specimen. Holotype labels: ‘Rurrenabaque // BeniBolivia // WMMann’ ‘Mulford // BioExpl // 1921–22 ’ ‘Nov’ ‘Frank M. Hull // Collection // C.N.C. 1973’ ‘CNC DIPTERA // # 161216 ’ ‘ Holotype // Pelecinobaccha // morgani // Miranda’ [red label].

Paratypes. BRAZIL. São Paulo, Araçatuba, Córrego Azul, Mar 1947, M.P. Barretto (1 ♂, MZUSP); …, Caraguatatuba, Res. Flor.— 40m., Exp. Dep. Zool., 7–14 Jul 1962 (1 ♂, MZUSP); …, Juqiá, Frank M. Hull Collection C.N.C. 1973, J. Lane (1 ♂, CNC Diptera 161217); Mato grosso, West Border, May 1931, R. C. Shannon (2 ♂, USNM ENT 0 0 257699 & ...706). PERU. Madre de Dios, Avispas , 400m., 10–30 Sep 1962, L. Pena (2 ♂, CNC Diptera 161214 –5); … Rio Manu, Pakitza, 250m, 12°7'S 70°58'W, 9–23 Sep 1988, A. Freidberg (2 ♂, USNM ENT 0 0 257697 & ...708).

Comments. The external morphology is very similar to P. transatlantica , but P. morgani has a distinct surstylus, a rectangular and wide subepandrial sclerite and its postgonite is not greatly enlarged baso-ventrally.

Etymology. The specific epithet is a patronym honouring Morgan D. Jackson, colleague and friend. It is to be treated as a noun in the genitive case.

Figures

FIGURE 34. a – e. Pelecinobaccha morgani sp. nov.: a – d. Male genitalia: a. Epandrium, lateral. b. Epandrium, ventral. c. Hypandrium, lateral. d. Hypandrium, ventral. e. Holotype, habitus, dorsal. f – i. Pelecinobaccha peruviana (Shannon, 1927), female: f. Holotype, basal abdominal segments, dorsal. g. Holotype, 5 th and 6 th abdominal segments, dorsal. h – i. Genitalia: h. 7 th tergite, dorsal. i. 7 th segment, lateral. s scl: subepandrial sclerite.