Pelecinobaccha eruptova (Hull, 1943) Hull, 1943

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 : 42-43

Pelecinobaccha eruptova (Hull, 1943) comb. nov.

Map 10. Figure 28 .

Baccha eruptova Hull, 1943 — Hull, 1943b: 40. Type locality: Peru, Loreto, Iquitos. Holotype male USNM. Hull, 1949a: 204 (fig. 61, female abdomen), 276 (fig. 365, female wing)

Baccha zerene Hull, 1949 — Hull, 1949b: 245. Type locality: Peru, Chanchamayo. Holotype male CNC. n. syn.

Male. Head: Black. Face narrowing slightly below tubercle, pale on lateral ⅓. Lunule with black central macula, usually pale above antennal insertion and around macula but leaving a dark vitta connecting the macula to the frontal triangle color. Frontal triangle entirely black, with silvery-white pollen laterally restricted to oval spots, disconnected from the pollen from the face. Vertical triangle with 3 rows of pile, but most pile concentrated in a single median row; ocellar triangle ~1.5 times its length from posterior eye margin. Eye contiguity slightly shorter than vertical triangle length. Eye with sub-triangular indentation on posterior margin positioned slightly dorsal to level of antenna insertion. Antennal insertions confluent, ventral sclerotized margin slightly extended dorsally. Dorsal ¼ of occiput with 2 rows of simple black pile, anterior row with very short pile; middle ½ with 2–3 rows of pile, anterior rows simple and black, posterior row scale-like, long and white; ventral ¼ with 2–3 irregular rows of scale-like white pile.

Thorax: Dark brown to black. Scutum with cordiform region of sparse pollen anterior to scutellum; scutum with mainly short, erect, black pile, except longer on cordiform region, laterally anterior to transverse suture and on an anterior white pilose row (interrupted in the middle). Scutellum dark brown, pile black and long, as long as cordiform region, subscutellar fringe pile long, pale medially and usually black laterally. Pleuron usually entirely black, sometimes with small pale area ventro-posteriorly on posterior anepisternum; pleuron white pilose, except black pilose on ventro-posterior katepisternum, and usually with black pile on anterior anepisternum, posterior ½ of posterior anepisternum, anterior anepimeron, and sometimes dorso-posterior katepisternum with black pile intermixed. Plumula normal, yellow to light brown. Calypter light brown with darker margin and fringe. Halter yellow, apex of stem dark brown.

Wing: Basal ½ dark (cells bc, c, sc, basal ⅔ of r1, basal ⅓ of r2+3, r, base of r4+5, bm, basal ¼ to ⅓ of dm, basal ⅓ or ½ of cua1, diffusely dark or darker on anterior margin of cu p), entirely microtrichose; alula large, basally 2 times to apically 4 times as broad as c cell, dark or anterior ½ dark, entirely microtrichose.

Legs: Proleg dark brown, profemur sometimes light brown on basal ⅔. Mesoleg dark brown. Metaleg dark brown, pale from apical ⅓ or ¼ of metabasitarsomere to apical metatarsomere.

Abdomen: Dark brown to black; 3.9 times as long as thorax. First tergite black pilose on dorsal ½ and white pilose elsewhere, sometimes mostly black pilose. Second tergite long, length 4 times minimum width, pale on baso-lateral ⅔; 2nd tergite with median-subapical triangular region of dull black pollen, and with black, long and erect pile laterally, with short and appressed pile dorsally. Third tergite trapezoidal and long, length 2.2 times minimum width, baso-lateral corners with triangular faint pale maculae and sometimes with a pair of faint pale vittae medially; 3rd tergite with large central triangular region of dull black pollen and with short, appressed and black pile. Fourth tergite sub-quadrate to rectangular and long; remaining characteristics as on 3rd. Fifth tergite either rectangular and wide or sub-quadrate; remaining characteristics as on 3rd. Genitalia: Cercus with 1 regular row of pile on medial margin and 2 regular rows on lateral margin. Surstylus directed ventrally, with rounded apex, with strong setulae (around 8) on ventral apex and 3–5 thinner setulae on apical ½, dorso-medial ⅓ constituted of a thin sclerotized layer, pilose on basal ½ of the dorsal surface. Subepandrial sclerite trapezoidal, apical margin with 3 small extensions, central one directed dorsally, lateral ones connected to base of the surstyli, posterior end almost straight. Hypandrium with ventral notch extending to anterior ⅔. Phallapodeme tapering on basal ⅓. Distiphallus smooth and anterior surface straight. Postgonite with pile mainly on ventral surface, ventral surface slightly expanded, convex until dorso-apical extremity, dorsal surface slightly concave; postgonite apex convex anteriorly, with acute dorsal extremity.

Female: Similar to male except: Pale on face and lunule more distinct. Ocellar triangle ~2 times its length from posterior eye margin and ~1 ocellus-width from lateral eye margin. Occiput middle with 3–4 rows of pile. Cell cu p and anal lobe distinctly entirely dark. Second abdominal tergite shorter than on male, length 2.6 times minimum width, light brown, with dull pollinose region smaller, and lateral pile much shorter than on male. Third tergite shorter than on male, baso-lateral ½ with wide quadrate maculae. Fourth tergite sub-quadrate, longer than wide.

Fifth tergite slightly tapering towards apex, long, length 1.3 times minimum width. Sixth segment long, 5.2 times as long as wide and 1.7 times as long as 5th tergite. Genitalia: 7th tergite short, basal extensions as long as the 6th segment; 7th segment lateral sclerite triangular; 7th segment with central dorsal longitudinal membranous area bare. Eighth tergite central region unsclerotized, basal crest sclerotized, straight, apex more acute. Cercus with 1 row of pile on apical margin.

Length. 12–12.5mm; wing 9–9.5mm.

Distribution. Brazil (Amazonas, Rondônia), Peru (Cuzco, Lima, Loreto, Madre de Dios, Ucayali).

Material examined. BRAZIL. Amazonas, Ipixuna, Rio Gregório, Com. Lago Grande, 07°10'11.7'' S 70°49'10.3'' W, 18–23 May 2011, M. M. Casagrande & O. H. Mielke (1 ♀, INPA-DT0000168); ..., Manaus, km 65 Boa Vista Rd., 14 Mar 1973, B. V. Peterson (1 ♂, CNC Diptera 160831); Rondônia, Nova Mamoré, Pq. Est. do Guaiará Mirim, Rio Formoso, dry Malaise trap on ‘terra firme’, 10°19'26'' S 64°38'88'' W, 22 Oct 1995, J. Vidal & L. S. Aquino (1 ♀, INPA-DT0000257). PERU. Cuzco, Pilcopata, 13 Feb 1978, P. M. Marsh (1 ♂, USNM ENT 00257683); [Junín], Chanchamayo, Holotype Baccha zerene Hull CNC No 20536 [red label], 0 3 Jul ??48, J. Schunke (1 ♂, Holotype Baccha zerene , CNC Diptera 203489); [Lima], Iquitos, Holotype [red label], Type No 56425 USNM [red label], Mar–Apr 1931, R.C.S. Shannon (1 ♀, Holotype Baccha eruptova , USNM); Loreto, El Indio (Cerros de Contamana), 10 Sep [19]86, P. Hocking (1 ♀, USNM ENT 00257669); ..., Explorama Lodge, 80 km NE Iquitos on Amazon river, 24 Jun–20 Jul 1990, Menke & Awertschenko (1 ♀, USNM ENT 00257685); Madre de Dios, Manu, Rio Manu, Pakitza, 250m, 12°7'S 70°58'W, Malaise trap, 9–23 Sep 1988, W. N. Mathis (1 ♂, USNM ENT 00257693); ..., Erika (near Salvacion), 550m, 5–6 Sep 1988, A. Freidberg (1 ♀, USNM ENT 00257692); [Ucayali], Pucallpa , 8 Nov 1947, J. Schunke (1 ♂, CNC Diptera 160830).

Comments. One male specimen from Loreto ( Peru) has an entirely white-pilose posterior anepisternum, but this is considered to be an intraspecific variation.

Figures

FIGURE 28. Pelecinobaccha eruptova (Hull, 1943). a – b. Female genitalia: a. Oblique dorsal. b. Lateral. c – f. Male genitalia: c. Epandrium, lateral. d. Epandrium, ventral. e. Hypandrium, lateral. f. Hypandrium, oblique ventral. g. Holotype Baccha zerene Hull, 1949 (= Pelecinobaccha eruptova), habitus, dorsal. 7 tg: 7 th tergite, 8 tg: 8 th tergite, 10 tg: 10 th tergite, cerc: cercus, s scl: subepandrial sclerite.