Pelecinobaccha mexicana ( Curran, 1930 )

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: 54-55

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Pelecinobaccha mexicana ( Curran, 1930 )

comb. nov.

Pelecinobaccha mexicana ( Curran, 1930)  comb. nov.

Map 12. Figure 33View FIGURE 33.

Baccha mexicanus Curran, 1930  .— Curran, 1930: 6 (nom. nov. for lugubris Williston  ). Hull, 1949 a: 216 (fig. 114, male abdomen), 254 (fig. 360, male wing).

Baccha lugubris Williston, 1891  .— Williston, 1891: 37 (preocc. Phillipi, 1865). Type locality: Mexico, Tabasco, Venta de Zopilote, 2800 ft., Teapa; Guerrero, Chilpancingo, 4600 ft., Veracruz, Atoyac. Holotype male BM NH (not examined) and female AMNH (synonymised by Fluke 1956).

Baccha batesi Curran, 1939  .— Curran, 1939: 10. Type locality: Guatemala, San Sebatian, Reu. Holotype male AMNH. Hull, 1949 a: 220 (fig. 136, female abdomen), 282 (fig. 382, female wing) (synonymised by Thompson et al. 1976).

Male. Head: Black. Face pale on lateral ⅓ to ¼. Lunule usually pale dorsal to antennal insertions, central black macula connected to frontal triangle color by median vitta. Frontal triangle entirely black, with silvery-white pollen laterally, continuous from the face, and brown pollen medially. 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 as long as vertical triangle length. Eye with sub-triangular indentation on posterior margin at level of antenna insertion. Antennal insertions confluent, ventral margin with short dorsal extension. Dorsal ¼ of occiput with 2 rows of simple black pile, anterior row with very short pile, middle 2 ⁄ 4 with 3–4 rows of scale-like white pile, posterior row with very long pile, anterior rows shorter and sometimes with some simple black pile dorsal to indentation, ventral ¼ with 2–3 rows of scale-like white pile.

Thorax: Scutum black, mostly brown dull pollinose, except white on notopleuron, with sub-median short pair of vittae of concentrated dull pollen; scutum mainly black pilose, except white on notopleuron and anterior to scutellum, and usually with some black pile anterior to transverse suture on notopleuron; scutum anterior row of shining white pile with shorter pile medially. Scutellum dark brown to black, with shining brown pollen, pile long and black, longer than on scutum, sub-scutellar fringe long and white. Pleuron white pilose and black, except usually pale on posterior ½ of posterior anepisternum and dorso-posterior katepisternum. Plumula long and white. Calypter white. Halter yellow to light brown, capitulum sometimes orange.

Wing: Dark brown, posterior margin lighter (dark on cells bc, c, sc, r, r 1, r 2 + 3 and bm, other cells gradually get lighter towards the posterior margin), entirely microtrichose; alula infuscated, sometimes slightly brown on anterior margin, large, basally 1.4 times to apically 3.4 times as broad as c cell, entirely microtrichose.

Legs: Proleg brown to dark brown, profemur and base of protibia pale. Mesoleg light brown to dark brown, apex of mesofemur and basal ⅔ of mesotibia pale. Metaleg dark brown, pale on basal ½ of metafemur, base of metatibia and apical ¼ to 1 / 5 of metabasitarsomere until 5 th metatarsomere, 5 th metatarsomere sometimes light brown; white pilose dorsally on metacoxa.

Abdomen: Dark brown to black, 3.9 times as long as thorax. First tergite black pilose median-laterally, white elsewhere. Second tergite long, length 4 times minimum width, usually pale on baso-lateral ⅔; 2 nd tergite with rectangular black dull pollinose region medially, and mainly black pilose, except white basally and on baso-lateral ⅔, pile long laterally and mostly appressed, except erect basally and laterally. Third tergite trapezoidal and long, length 2.8 times minimum width, usually pale on baso-lateral ½ and on apical margin; 3 rd tergite with large central triangular region of dull black pollen, and with appressed black pile, except erect and white on baso-lateral corners; 3 rd sternite rectangular and long. Fourth tergite sub-quadrate long, 1.2 times as long as wide, with baso-lateral triangular pale maculae, and with with appressed black pile, except white on baso-lateral corners; remaining characteristics as on 3 rd. Fifth tergite rectangular and wide, sometimes pale on baso-lateral corners, with 3 central vittae of dull black pollen, and with appressed black pile. Genitalia: Cercus with 2 irregular rows of pile on medial margin, 3 irregular rows of pile on lateral margin. Surstylus long with rounded apex in lateral view, directed ventrally, with setulae ventrally, short on apical ¼ (around 10) and slightly longer medially and basally (around 3 on each region), pilose on basal ½ dorsally. Subepandrial sclerite homogenously sclerotized, rectangular and long, slightly concave on posterior margin, trapezoidal apically, with a pair of short extensions on apex. Hypandrium with ventral notch on anterior ½, notch with straight posterior margin. Phallapodeme well sclerotized dorsally, lighter ventrally. Basiphallus with posterior extremity long; distiphallus with medial convexity on anterior surface, apex curved apically. Postgonite with ventral surface straight, dorsal surface concave; postgonite apex convex anteriorly and rounded on ventral extremity and acute on dorsal extremity.

Female: Like male except: Frons normal; lateral white pollen restricted to ventral ¾ of frons. Vertex narrow; ocellar triangle ~ 2.5 times its length from posterior eye margin and ~ 1 occellus-width from lateral eye margin. Wing dark regions more sharply defined (dark brown on cells bc, c, sc, r, r 1, r 2 + 3 except for hyaline middle portion on posterior margin, base of r 4 + 5 and bm, light brown on basal ½ of dm, apical ⅓ of cu p and basal ¾ of cua 1, other cells hyaline). Profemur sometimes entirely pale, protibia sometimes with basal ⅔ pale. Second to 4 th protarsomeres and 3 rd and 4 th mesotarsomeres slightly swollen. Metabasitarsomere sometimes with apical ⅓ pale. First abdominal tergite with less black pile. Second abdominal tergite shorter, length 2.9 times minimum width, pale on baso-lateral ½, and with central triangular region of dull black pollen. Third abdominal tergite shorter, length 1.7 times minimum width, with baso-lateral pale triangles. Fourth abdominal tergite rectangular and wide, sometimes with baso-lateral fasciate pale maculae. Sixth segment conical, normal, 1.2 times as long as 5 th tergite. Genitalia: 7 th tergite rectangular with triangular apex; 7 th segment lateral sclerite rectangular, with baso-ventral extensions. Eighth tergite unsclerotized medially, basal crest normal, with subapical sclerotized bridge joining both halves, apex unsclerotized on dorsal and apical margin; 8 th sternite unsclerotized medially. Cercus with 1 row of pile on apical margin.

Length. 11–14mm; wing 8.5–11mm.

Distribution. Costa Rica (Guanacaste, Limón), El Salvador (La Libertad), Guatemala (Alta Verapaz, Chilmatenango), Mexico (Chiapas, Guererros, Morelos).

Material examined. COSTA RICA. Guanacaste, R.V.S. Bosque Diriá, Libre, 160m., L N 239623 361899, #73746, 13 Feb 2003, Y. Cardenas (1 ♂, INB0003717520 INBIOCRI COSTA RICA); ..., Río Boston, 300m., L_N_ 253350 _ 435900, #47847, 21 Jun 1997, F. Alvarado (2 ♂, INBIO CRI 002 572690 & 572691); ..., Santa Cruz, Vista del Mar, Torre COCESNA, Red. com aguamiel, 972m., L N 235350 357500, #73744, 10 Feb 2003, Y. Cardenas (1 ♂, INB0003717457 INBIOCRI COSTA RICA, 1 ♀, INB0003717459 INBIOCRI COSTA RICA); ..., Manual (red. libre), L N 235340 357490, #56433, 16 Feb 2000, Y. Cardenas (1 ♀, INB0003077657); Limón, R. B. Hitoy Cerere, Send. Espavel, 560m., Libre, L S 401200 569800, #73453, 12– 30 Mar 2003, F. Rojas, B. Gamboa & W. Arana (1 ♀, INB0003706638 INBIOCRI COSTA RICA). EL SALVADOR. [La Libertad], Santa Tecla, 0 6 Jun 1958, L. Bottimer (1 ♀, USNM ENT 00257759). GUATEMALA. [Alta Verapaz], S. Cristobal, Santa Vera  Paz, 17 May 1926, J. M. Aldrich (1 ♂, USNM ENT 00257758); [Chimaltenango], Yepocapa, Aug 1949, H. T. Dalmat (1 ♂, USNM ENT 00257757); ..., Finca Recreo, 0 1 Sep 1949, O. Ochoa (1 ♀, USNM ENT 00257752). MEXICO. Chiapas, 6.0 km SW Ocosingo, 1400m, 22 Sep 1992, M. Wood (1 ♀, CNC Diptera  161326); ..., 15km. N Ocosingo, 20 May 1981, C.M. & O.S. Flint, Jr. (1 ♂, USNM ENT 00257751); …, El Sumidero, 14 Sep 1974, G. Bohart & W. Hanson (1 ♂, USNM ENT 00257651); …, Finca Prussia (33 km S. Jaltenango), 1000m., 10–12 May 1985, A. Freidberg (1 ♂, USNM ENT 0 0 257753, 2 ♀, USNM ENT 00257754– 5); Guerrero, Iguala, 33 Mi S, 1450 ’, 5 Aug 1954, J. G. Chillcott (1 ♂, CNC Diptera  161324); Morelos, Cuernovaca, 14 Mi S, 3200 ’, 3 Aug 1954, J. G. Chillcott (1 ♂, CNC Diptera  161322); ..., 35 Mi. S., Frank M. Hull Collection C.N.C. 1981, 27 Aug [19] 59, R.H. Painter & E.M. Painter (1 ♂, CNC Diptera  161325).


American Museum of Natural History


Universidade do Extremo Sul Catarinense, Bairro Universitário


Smithsonian Institution, National Museum of Natural History


Ministry of Natural Resources


Canadian National Collection of Insects, Arachnids, and Nematodes














Pelecinobaccha mexicana ( Curran, 1930 )

Miranda, Gil Felipe Gonçalves, Marshall, Stephen A. & Skevington, Jeffrey H. 2014

Baccha mexicanus

Hull 1949: 216
Curran 1930: 6