Atylobaccha Hull, 1949

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 : 7

Genus Atylobaccha Hull, 1949

Atylobaccha Hull, 1949a: 94 [type species Baccha flukiella Curran, 1941 (original designation)]. Proposed as a subgenus of Leucopodella .

Diagnosis. Head. Face very narrow (around ¼ of head width) and entirely dark; tubercle very weak, face convex in profile ( Fig. 1 a). Frons narrow (between ¼ and ⅓ of head width). Antennal insertions confluent. Female ocellar triangle adjacent to lateral eye margin. Dorsal occiput with 1 row of pile (as in Fig. 45b ). Thorax. Scutum entirely dark with anterior row of longer pile, anterior row with shorter pile medially. Scutellum entirely dark. Anterior anepisternum pilose. Katatergite with short microtrichia giving the sclerite a ‘velvet’ appearance. Metaepisternum bare. Metasternum bare. Dorsal lobe of calypter with marginal pile shorter than ventral lobe pile. Metabasitarsomere dark but with apex pale. Wing. Alula width ~3 times as broad as c cell. Wing hyaline to light brown, entirely microtrichose. Abdomen. Abdomen petiolate with 2nd segment very narrow and long (similar to Fig. 44 g); 3rd and 4th abdominal tergites with central pair of short pale vittae and sub-basal lateral pair of pale fasciate maculae. Genitalia. Female 7th tergite rectangular and wide ( Fig. 1 c); 8th tergite rectangular and wide with basal and apical margin shallowly concave ( Fig. 1 c); 10th tergite reduced to a pair of quadrate sclerites with narrow baso-lateral projections; cercus without dorsal setulae ( Fig. 1 c). Male subepandrial sclerite rectangular, wide and short, with baso-lateral corners slightly extended and acute; surstylus short and almost oval ( Fig. 1 e); basiphallus teardrop-shaped ( Fig. 1 d), distiphallus membranous but with dorsal sclerotized triangular region.

Included species. A. flukiella ( Curran, 1941) .

Notes. Atylobaccha currently includes only the species A. flukiella ( Curran, 1941) . Hull (1949a) described Atylobaccha as a subgenus of Leucopodella for the “quite small peculiar species, flukiella Curran , with its hyaline wings and simple femora”. Hull (1949a) treated Atylobaccha as a separate genus in his key (p. 102), although earlier in the same paper (p. 94) he explicitly stated that it should be regarded as a subgenus of Leucopodella .

Figures

FIGURE 1. Atylobaccha flukiella (Curran, 1941). a. Head, lateral. b. Wing. c. Female genitalia, dorsal. d – f. Male genitalia: d. Hypandrium, lateral. e. Epandrium, dorsal. f. Epandrium ventral. g. Holotype, habitus, dorsal (copyright AMNH). 8 tg: 8 th tergite, 10 tg: 10 th tergite, cerc: cercus, s scl: subepandrial sclerite, surst: surstylus.

FIGURE 44. Relictanum crassum (Walker, 1852). a – b. Female genitalia: a. Dorsal. b. Lateral. c – f. Male genitalia: c. Surstylus, ventral. d. Subepandrial sclerite, ventral. e. Hypandrium, lateral. f. Hypandrium, ventral. g. Male, habitus, dorsal. 8 tg: 8 th tergite, 10 tg: 10 th tergite, cerc: cercus, s scl: subepandrial sclerite.

FIGURE 45. a – e. Relictanum johnsoni (Curran, 1934), female: a – b. Head: a. Lateral. b. Dorsal. c – d. Genitalia: c. Dorsal. d. Lateral. e. Holotype, habitus, dorsal. f – h. Relictanum shropshirei (Curran, 1930), female: f – g. Genitalia: f. Lateral. g. Dorsal. h. Holotype, habitus, dorsal. 8 tg: 8 th tergite, 10 tg: 10 th tergite, cerc: cercus.