Stipomorpha inarmata (Curran, 1925)

Reemer, Menno, 2013, Taxonomic exploration of Neotropical Microdontinae (Diptera: Syrphidae) mimicking stingless bees, Zootaxa 3697 (1), pp. 1-88 : 55

Stipomorpha inarmata (Curran, 1925)

Figs 158–161 , 236 .

Microdon inarmatus Curran, 1925: 5 .

Studied type specimens. HOLOTYPE. GUYANA. Male. Label 1: "Collection C.W. Johnson"; label 2: "Bartica, BG, IV. I 1901 "; label 3 (red): " Type Microdon inarmatus Curran "; label 4 (red): " Type 7656"; label 5: " Jan.-July 2003, MCZ Image Database". Coll. MCZ.

Additionally studied specimens. BRAZIL: 1 male & 1 female, Boca do Cuminá-Miri, Oriximiná, PA [Pará], 19-26.I.1968, Exp. Perm. Amaz, coll. USNM. FRENCH GUYANA: 1 female, Kaw Mountains, 04°32.893'N- 52°10.245'W, 8.XII.2002, leg. V. Soon, coll. RMNH; 1 female, Roura, Kaw Road, PK 37, Relais Patawa, N 04°32’42”- W 52°09’09”, malaise trap, XII.2008, leg. J.A. Cerda, coll. RMNH. GUYANA: 1 male, Essequibo R., Moraballi Creek, 29.IX.1929, leg. Oxf. Univ. Expedn., coll. CNC.

Redescription

Adult male. Body size: 8 mm.

Head. Face occupying 1/4 of head width in frontal view; shining yellow with blackish brown median stripe from oral margin to antennal fossa; face with white pilosity, a little longer around oral margin, except bare on median stripe. Gena brown. Occiput black; black pilose dorsally, getting white laterally and ventrally. Oral cavity with produced lateral margins and notched anterior margin. Frons and lunula black and short black pilose, except for bare triangular part posterior to lunula. Vertex black; black pilose. Eye very sparsely and short pilose, with pili about as long as ommati diameter, appearing bare under low magnification. Antennal fossa about as wide as high. Antenna brown; scape and pedicel dark pilose; antennal ratio 4:1:3.5; basoflagellomere parallel-sided with narrowly rounded apex, with sensory pit located at 3/4 from base, within a vague groove that ranges from just before 1/2 to just after the pit; arista slender, about 2/3 of length of basoflagellomere, very shortly pilose, appearing bare under low magnification.

Thorax. Scutum black, postpronotum and postalar callus pale brown, pleurae dark brown, scutellum dark brown. Postpronotum, scutum, postalar callus and scutellum short black pilose, except scutum with lateral fasciae of white pile along transverse suture and lateral prescutellar patches of white pile. Scutellum semicircular, without calcars. Anepisternum more or less flat, yellow pilose anterodorsally, bare posteriorly. Anepimeron pilose posterodorsally. Katepisternum and katepimeron bare. Calypter grey, halter yellowish.

Wing: hyaline; microtrichose except bare on basal 3/4 of cell br, basal 1/2 of cell bm, anterobasal 1/4 of cell cup, basomedially on alula.

Legs: brownish black, except anterior four tarsi yellow with first tarsomeres darker, and hind tarsi with last three tarsomeres yellow. Femora black pilose; anterior four tibiae white pilose; hind tibia white pilose on basal 2/3, black pilose on apical 1/3; tarsi black pilose dorsally, yellow pilose ventrally. Pile on hind-atibia a little longer than half the width of the tibia. First tarsomere of hind tarsus as long as 1/3 of length of hind-tibia, a little wider than apex of tibia, twice as long as wide (dorsal view). Coxae and trochanters pale pilose.

Abdomen. Blackish brown, except tergites 1 & 2 pale brown. Second segment wider than thorax, widest point at half the lentgh; third and fourth tergites strongly narrowing. Tergites pale pilose. Sternite 1 bare, sternite 2 probably bare, sternite 3 and 4 pilose. Genitalia as in fig. 236.

Female. Unknown.

Diagnosis. From other Stipomorpha- species with a black thorax, S. inarmata can be recognized by the following characters: face largely yellow with narrow median brown stripe, basoflagellomere slightly shorter than scape, alula partly bare, anepisternum only pilose anterodorsally, katepisternum bare, structure of male genitalia. The tarsi may be darker than in holotype.

Distribution. Known from Guyana, French Guyana and northern Brazil.

Figures

FIGURES 154 – 162. 154 – 157. Stipomorpha guianica (Surinam, coll. RMNH). 154. male, habitus dorsal; 155. male, habitus lateral; 156. male, head frontal; 157. female, habitus dorsal. 158 – 161. Stipomorpha inarmata male (holotype). 158. habitus dorsal; 159. habitus lateral; 160. head frontal; 161. wing. 162. Stipomorpha lacteipennis male (holotype), habitus dorsal.

FIGURES 233 – 239. Stipomorpha, male genitalia. 233. S. fraudator (holotype); 234. S. goettei (Surinam, coll. RMNH); 235. S. guianica (Surinam, coll. RMNH); 236. S. inarmata (holotype); 237. S. lacteipennis (lectotype); 238. S. lanei (Surinam, coll. RMNH); 239. S. litoralis (holotype).