Pelecinobaccha beatricea (Hull, 1942) Hull, 1942

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 : 27-28

Pelecinobaccha beatricea (Hull, 1942) comb. nov.

Map 11. Figure 20 .

Baccha beatricea Hull, 1942 .— Hull, 1942b: 73. Type locality: Brazil, São Paulo. Holotype female CNC. Hull, 1949a: 144 (redescription), 203 (fig. 53, female abdomen), 221 (fig. 137, male abdomen), 273 (fig. 354, male wing), 285 (fig. 391, female wing).

Ocyptamus beatricea . Thompson et al., 1976: 13 (catalog citation).

Baccha leucopoda Hull, 1948 .— Hull, 1948: 5. Type locality: Brazil, Goiás. Holotype female CNC. Hull, 1949a: 160 (redescription), 212 (fig. 100, female abdomen). n. syn.

Ocyptamus leucopodus . Thompson et al., 1976: 21 (catalog citation).

Male. Head: Dark red to black. Face distinctly pale on lateral ¼, and sometimes lateral ⅓ ventral to tubercle, white pilose laterally except black ventral to antenna, with distinct tubercle sparsely white pilose. Gena dark red. Lunule with central black maculae, distinctly pale above antenna insertion and around macula, usually separating macula from black of frontal triangle or leaving a narrow dark vita. Frontal triangle pale laterally except around eye contiguity, black pilose, with silvery-white pollen restricted laterally, continuous from face, and dull pollen medially. Vertical triangle with most black pile forming a central single row ending dorsal to anterior ocellus; ocellar triangle 1–1.5 times its length from posterior eye margin. Eye contiguity longer than vertical triangle length. Eye with sub-triangular indentation on posterior margin slightly dorsal to level of antenna insertion. Antennal insertions narrowly separated. Dorsal ¼ of occiput with 2 regular rows of black pile, anterior very short and posterior long; middle ½ with 3 irregular rows of white scale-like pile, posterior row longer; ventral ¼ with 2 irregular rows of scale-like white pile.

Thorax: Prothorax dark brown. Scutum dark brown, mostly brown dull pollinose, and with very short, erect, black pile, except pile slightly longer laterally posterior to transverse suture, and pile longer and white on notopleuron anterior to transverse suture; scutum anterior row of shining white pile interrupted in the middle. Scutellum brown to dark brown, with inconspicuous black pile, sub-scutellar fringe with white and long pile. Pleuron brown, pale on posterior ½ of posterior anepisternum and dorso-posterior portion of katepisternum; pleuron mostly white pilose except anterior anepisternum sometimes with some golden pile. Plumula short, brown. Calypter white, sometimes golden on margin and fringe pile. Halter brown, capitulum dark orange.

Wing: With dark anterior margin extending posteriorly on the middle, sometimes diffuse to hyaline apically (dark on cells bc, c, sc, r1, r2+3 except ⅓ antero-posterior portion, r, basal ⅓ of r4+5, bm, basal ½ of dm, anterior margin and apical 1/6 of cu p, and most of cua1), entirely microtrichose; alula with only anterior margin dark, large, basally 2.5 times to apically 4.5 times as broad as c cell, entirely microtrichose.

Legs: Proleg dark brown, profemur light brown, protibia pale on basal ⅔, probasitarsi sometimes pale on apex. Mesoleg dark brown, apex of mesofemur light brown, basal ½ to ⅔ of mesotibia pale. Metaleg dark brown, apex of metafemur and base of metatibia pale, apical ⅓ to ¼ of metabasitarsomere and other metatarsomeres white, except last metatarsomere orange; metacoxa with white pile dorso-laterally.

Abdomen: Dark brown; ~3.5 times as long as thorax. First tergite sparse to bare dorso-medially, pile white. Second tergite long, length 4–4.5 times minimum width, sometimes slightly lightened on baso-lateral ⅔; 2nd tergite with long triangular maculae of dull black pollen sub-apically pointing to the base, and with short, appressed black pile, and longer, erect, white pile on baso-lateral ½ (inconspicuous in some specimens). Third tergite trapezoidal and long, with a pair of small vittate pale maculae medially and a pair of triangular pale maculae baso-laterally, maculae sometimes inconspicuous and viewed as sub-shining markings; 3rd tergite with large triangular macula of dull black pollen medially, and with appressed black pile. Fourth tergite rectangular, slightly longer than wide; remaining characteristics as on 3rd. Fifth tergite rectangular, wide and short, with a pair of central vittate pale maculae; dull black-pollinose medially. Second to 4th sternites dull black-pollinose on apical ½. Genitalia: Cercus with 1 regular row of pile on medial margin and 3 irregular rows on lateral margin. Surstylus directed apically, with rounded apex, with strong setulae on ventral, slightly concave side, with very little of the dorsal thin sclerotized layer, pilose on basal ½ of the dorsal surface. Subepandrial sclerite well sclerotized all over, short, quadrate but with posterior corners extended laterally. Hypandrium with ventral notch extending to anterior ⅔. Distiphallus smooth and anterior surface straight. Postgonite with pile mainly on ventral surface, ventral surface slightly concave, dorsal surface slightly concave but convex on apical ½; postgonite apex convex anteriorly, with acute ventral and dorsal extremities, dorsal extremity longer than ventral.

Female: Like male except: Frons with pale lateral margin covering basal ½ or ⅔. Vertex with 1 central row of very short pile directed forward and ending dorsal to anterior ocellus; ocellar triangle ~2 times its length from posterior eye margin and ~1 ocellus-width from lateral eye margin. Scutum sometimes with sub-median pair of white pollinose vittae on anterior ⅔. Wing hyaline on most of cell r1 apex, apical ½ of r2+3 and apical ¾ of r4+5, that sometimes leaves an apical dark spot on the apex. Second abdominal tergite with a weaker dull macula, and all pile appressed and black. Fifth tergite with baso-lateral pale triangular maculae that sometimes are connected to medial vittae. Sixth segment as long as 5th tergite. Genitalia: 7th tergite with a pair of lateral, weakly sclerotized, long (as long as the 6th segment), narrow basal extensions into the 6th segment, with pair of short latero-ventral extensions; 7th segment lateral sclerite narrow apically but wider basally; 7th segment with central longitudinal area bare, extensive intersegmental membranous region between 7th and 8th segments. Eighth tergite unsclerotized medially. Cercus with 1 row of pile on inner margin.

Length. 11–14.5mm; wing 8.5–11.5mm.

Distribution. Argentina (Corrientes, Missiones), Brazil (Goiás, Mato Grosso, Paraná, Santa Catarina, São Paulo), Paraguay (Caazapá, Guairá, Paraguari), Venezuela (Carabobo).

Material examined. UNKNOWN. Piedris B., S. W. Williston collection, Am. Mus. Nat. Hist. Dept. Invert. Zool. nº 19186, Apr (1 ♀, AMNH). ARGENTINA. Corrientes, Ytuzaingo, Sep 1982, Fritz (1 ♂, USNM ENT 0 0 257745, 1 ♀, USNM ENT 0025744); [Missiones], Iguazu Falls, Oct 1927, R. C. & E. Shannon (1 ♂, USNM ENT 00257750); ..., 5 km Puerto Iguazo, behind Hotel Orquideas, 1–6 Feb 1992, S. A. Marshall (1 ♂ & 1 ♀, DEBU). BRAZIL. Goiás, Campinas, Frank M. Hull Collection C.N.C. 1973, Dec 1935, Borgmeier & S. Lopes (1 ♀, CNC Diptera 161240); …, “142”, “ Baccha ? clarapex Wied. // XII 36 Det. H. S. Lopes”, Jan 1936, R. Spitz (1 ♀, AMNH); ..., Jan 1938, Spig (1 ♀, CNC Diptera 161241); ..., Baccha clarapex var. fumaria n.v. Hull (1 ♀, holotype Baccha leucopoda , CNC Diptera 161226); …, Corumbá [de Goiás], F. Manjolinho, Nov 1945, [M.P.] Barretto (1 ♀, MZUSP); Mato Grosso, Maracaju, Frank M. Hull Collection C.N.C. 1973, May 1937 (1 ♀, CNC Diptera 161227); Paraná, Iguassu, Frank M. Hull Collection C.N.C. 1973, Dec 1941, Com. E. N. V. (1 ♀, CNC Diptera 161228); ..., Londrina, Mata dos Godoy, 28 Jan–2 Feb 1990, S. A. Marshall (2 ♂, DEBU); Santa Catarina, Nova Teutônia, 27°11'S 52°23'W, Frank M. Hull Collection C.N.C. 1973, 300– 500m, Oct– Mar 1930, 1934, 1936, 1939, 1948, 1956, 1958, 1959, 1964, 1966–1970, F. Plaumann (46 ♂, CNC Diptera 160793 –822, 160827, AMNH, MZUSP & USNM, 38 ♀, CNC Diptera 161227, 161229 –36, 161238 –9, 161242 –50, AMNH, MZUSP & USNM); São Paulo, Barueri, 26 May 1966, K. Lenko (1 ♀, MZUSP); ..., Holotype beatricea [red label], Holotype Baccha beatricea Hull CNC nº20504 [red label], Cid. Jardins, Dec 1940, J. Lane (1 ♀, Holotype Baccha beatricea , CNC Diptera 203483); ..., Itaporanga, N. B. Antonina, Jan 1946 , [M.P.] Barretto (1 ♀, MZUSP); …, Mogi Guacu, Campininha, 23–28 Oct 1970, J. W. Boyes (1 ♀, CNC Diptera 160828); …, Pompeia, Frank M. Hull Collection C.N.C. 1973, Nov 1939, [M.P.] Barretto (1 ♂, CNC Diptera 160823); ..., Porto Cabral, Rio Paraná, Frank M. Hull Collection C.N.C. 1973, 15–30 Oct 1941, L. Travassos, Filho (1 ♂, CNC Diptera 160824); ..., Pres. Epitácio, Pto. Albano, Rio Paraná, Oct [19]54, J. Lane (1 ♂, MZUSP); ..., E. Rabello (2 ♂, MZUSP); ..., Sto. Amaro, Oct [19]62, J. Lane (1 ♂, MZUSP). PARAGUAY. [Caazapá], Pastore[o], 28 Jan, D. Wees (1 ♂, CNC Diptera 160825); …, N Pastoreo, 3–7 Jan 1972 (1 ♂ & 1 ♀, MZUSP); [Guairá], Villarica, Nov, F. Schade (1 ♂, CNC Diptera 160826); Paraguari, Ybycui (25 km SE), in Ybycui National Park, 12–24 Apr 1980, P. J. Spangler et al. (2 ♂, USNM ENT 0 0 257747 & ...748); San Pedro, Rio Ypane Cororo, Dec 1983, M. A. Fritz (1 ♂, USNM ENT 00257746). VENEZUELA. Carabobo, Henri Pitier National Park, Portachuelo Pass, 10 20'51''N 67 41'16''W, 1143m, 13 & 15 Sep 2008, J. Skevington (2 ♀, JSS25214 & ...251).

Comments. Females differ from males only in wing pattern and terminalia. In most other Pelecinobaccha species, the size and shape of the abdominal segments differs between males and females.

Two female specimens from Venezuela (JSS25251 and JSS25214) differ slightly from the above description but this is considered intraspecific variation since the genitalia agree with the species description. These specimens have darker wings with cell cu p and the anal lobe mostly dark, and the hyaline region light brown tinged. In addition, the subscutellar fringe, the postero-dorsal corner of the posterior anepisternum, and the anterior anepimeron have black pile and the abdomen is completely devoid of pale markings.

The type specimen for B. leucopoda was missing, but a specimen from Goiás ( Brazil) was found in a miscellaneous drawer from the Frank M. Hull collection at the CNC labeled as ‘ Baccha clarapex var. fumaria n.v. Hull’ in Hull’s handwriting. Hull’s description and the type-locality match the specimen, so it was labeled as the holotype of B. leucopoda (fixation by monotypy according to ICZN 73.1.2.) to guarantee a universal interpretation of the name. Hull related the species to B. clarapex but apparently did not compare it thoroughly to his own B. beatricea , probably due to the dark apical spot of the latter. The dark apical spot is here considered to be an intraspecific variation of this species, and since the remaining characters of B. leucopoda agree with the current redescription, B. leucopoda is hereby treated as a junior synonym of B. beatricea .

Figures

FIGURE 20. Pelecinobaccha beatricea (Hull, 1942). a – d. Female genitalia: a. 7 tergite, dorsal. b. Apex, dorsal. c. 7 th segment, lateral. d. Apex, lateral. e – h. Male genitalia: e. Surstylus, ventral. 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.