Pelecinobaccha peruviana ( Shannon, 1927 )

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 : 63-64

Pelecinobaccha peruviana ( Shannon, 1927)

Map 12. Figure 34 (f–i).

Baccha peruviana Shannon, 1927 . Shannon, 1927:10. Type locality: Peru, Chanchamayo. Holotype female USNM. Hull, 1949a: 207 (fig. 69, female abdomen; fig. 70, male abdomen).

Ocyptamus peruvianus . Thompson et al., 1976: 25 (catalog citation).

Male. Head: Dark brown. Face pale on lateral 1/5, tubercle large and without pollen. Lunule entirely dark brown, central black macula broadly connected to frons color. Frontal triangle with shining white pollen in small lateromedial spots. Antennal insertions confluent, ventral margin with short dorsal extension. 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. Dorsal ⅓ of occiput with 2 rows of simple black pile, anterior row short; middle ½ with 2–3 rows of scale-like white pile, anterior rows shorter, dorsal anterior rows sometimes with black pile dorsally; ventral ¼ with 2–3 rows of scale-like white pile, anterior rows shorter.

Thorax: Dark brown. Scutum dull brown-pollinose, and sometimes with a pair of sub-median vittae of dull white pollen; scutum mainly with short black pile, notopleuron white pilose but area anterior to transverse suture sometimes black pilose, and anterior row of shining white pile not so distinct and largely interrupted in the middle. Scutellum dark brown, with short black pile, subscutellar fringe pile normal and black. Pleuron white pilose and dark brown, sometimes slightly lightened on dorso-posterior ½ of posterior anepisternum and dorso-posterior katepisternum. Calypter white. Plumula white. Halter light brown.

Wing: Dark brown, lighter on apical 1/5, entirely microtrichose; alula around 2.5 times as broad as c cell, entirely brown, entirely microtrichose.

Legs: Dark brown. Profemur mostly brown. Metacoxa pile white dorsally, remainder of metalegs missing.

Abdomen: Elongated, 3.9 times as long as thorax, dark brown. First tergite white pilose, a few black pile basodorsally. Second tergite rectangular and long, length 4.1 times minimum width, with central triangular macula of dull black pollen, with short appressed black pile dorsally and longer erect white pile laterally. Third tergite rectangular and long, length 3.4 times minimum width, with central triangle of dull black pollen with anterior bare incision; 3rd tergite with appressed black pile but very sparse dorsally. Fourth tergite rectangular and long, length 2.4 times minimum width, pile not so sparse dorsally; remaining characteristics as on 3rd. Fifth tergite sub-quadrate, with dull black pollen medially; remaining characteristics as on 4th. Genitalia: Not dissected

Female: Like male except: Head dark brown to black. Face pale on lateral ¼. Lunule sometimes pale above antennal insertions, central black macula broadly connected to frons color. Frons dull brown-pollinose, shining white pollen in small latero-medial spots. Vertex with a single median row of pile; ocellar triangle ~2 times its length from posterior eye margin, and ~1 occellus-width from lateral eye margin. Dorsal ⅓ of occiput anterior row very short. Wing with basal ¾ dark brown (dark on cells bc, c, sc, r, basal ¾ of r1, basal 3/5 of r2+3, basal ⅓ of r4+5, bm, basal ½ of dm, apical ½ of cu p and basal ½ of cua1); alula hyaline, basally 1.3 times to apically 2.4 times as broad as c cell. All tibiae sometimes pale apically. Proleg and mesoleg sometimes light brown, and brown subapically on tibiae and whole tarsi. Metaleg dark brown, metafemur sometimes light brown, apical 1/5 of metabasitarsomere until 4th metatarsomere pale. Abdomen greatly elongated, 6.5 times as long as thorax, 2nd to 6th abdominal tergites of similar lengths but narrowing slightly towards apex, dark brown. Second tergite rectangular very long, length 2.9 times minimum width, with subapical pair of fasciate maculae of dull black pollen; mostly with appressed black pile, with some white pile on base and baso-lateral ¼. Third tergite very long, length 3 times minimum width, with pair of central triangles of dull black pollen; with appressed black pile. Fourth tergite very long, length 3.8 times minimum width, without dull black pollen; with sparse appressed black pile. Fifth tergite similar to 4th, length 3.6 times minimum width, and fused to sternite at apex. Sixth segment cylindrical long, length 5.8 times minimum width and slightly longer than 5th. Genitalia: 7th tergite rectangular and wide, short, apical margin convex with short irregular medial projection, weakly sclerotized; 7th segment lateral sclerite triangular large, extending dorsally apical and contiguous to 7th tergite, baso-ventral extensions unsclerotized and as long as basal extensions of the 7th tergite.

Length. 14–16.5mm; wing 8.5–9mm.

Distribution. Peru (Junín).

Material examined. PERU. [Junín], Chanchamayo, Allotype nº 28761 U.S. N.M. [red label], W.F.H. Rosenberg (1 ♂, allotype Baccha peruviana , USNM); …, 1100m., Frank M. Hull Collection C.N.C. 1973, 19 Aug 1948, J. Schunke (1 ♀, CNC Diptera 161283); …, Type nº 28761 U.S. N.M. [red label], W.F.H. Rosenberg (1 ♀, holotype Baccha peruviana , USNM); …, Paratype nº 28761 U.S. N.M. [red label] (1 ♀, USNM); El Campamiento, Col. Perene, Frank M. Hull Collection C.N.C. 1973, 21 Jun 1920, Cornell Univ. Exp. (1 ♀, AMNH)

Comments. The only male specimen (allotype) is too damaged to assess the condition of the alula precisely. One female specimen is missing the 5th and 6th abdominal segments and the specimen dissected is missing the 8th segment onwards.

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.