Stipomorpha lacteipennis (Shannon, 1927)

Reemer, Menno, 2013, Taxonomic exploration of Neotropical Microdontinae (Diptera: Syrphidae) mimicking stingless bees, Zootaxa 3697 (1), pp. 1-88 : 57-58

Stipomorpha lacteipennis (Shannon, 1927)

Figs 162–164 , 237 .

Microdon lacteipennis Shannon, 1927: 18 .

Microdon triangularis Curran, 1940: 6 . Syn. nov.

Studied type specimens. LECTOTYPE Microdon lacteipennis Shannon. BRAZIL. Male. Label 1 (blue label): " Syntype "; label 2: "Amazon. 66.53"; label 3: " Microdon Ubristes lacteipennis Snn.". Coll. BMNH.

HOLOTYPE Microdon triangularis Curran. BRAZIL. Male. Label 1 (red label): " Microdon triangularis Curran Holotype "; label 2: " Abril 1937 "; label 3: "Servico Febre Amarela, M.E.S., Bras."; label 4: Douradas, Mato Grosso, Brasil ". Coll. AMNH.

PARATYPE Microdon triangularis Curran. BRAZIL. Male. Label 1: "Dourados, Mato Gross, Brasil ", label 2: " Abril 1937 ", label 3: "Servico Febre, Amazon, M.E.S., Bras.", label 4: "R.C. Shannon collection", label 5: "From type series", label 6: " Microdon triangularis Cur. , det. F.M. Hull". Coll. USNM.

Additionally studied specimens. BOLIVIA: 1 male, Santa Cruz distr. 4 km N Bermejo, Refugio Los Volcanes, 1000 m, 18°06’S, 63°36’W, 25–30.X.2007, leg. A.R. Cline, coll. RMNH; BRAZIL: 1 male, Mato Grosso, Dourados, IV.1937, leg. Servico Febre Amarela, coll. CNC; PERU: 1 male, Madre de Dios, Tambopata, Sachavacayoc centre, 12°51’20”S – 69°22’20”W, 25.VI-4.VIII.2010, leg. J.T. Smit, coll. J.T. Smit; 1 male, same data as previous except date 23.III-– 28.IV.2011; SURINAM: 1 male, Blakawatra, 13.VI.1963, leg. J. v.d. Vecht, coll. RMNH; 1 female, Peperpot, 20–27.IV.2006, leg. M. Reemer, coll. RMNH. VENEZUELA: 1 male, T.F. Amaz., Cerro de la Neblina, Basecamp, 140 m., 0°50'N, 66°10'W, 10–20.II.1985, malaise trap in rainforest, leg. P.J. & P.M. Spangler, R.A. Faitoute, W.E. Steiner colrs, coll. USNM.

Redescription (based on lectotype)

Adult male. Body size: 5.5–7 mm.

Head. Face occupying 1/5 of head width in frontal view; black with narrow yellow lateral margins; entirely white pilose. Gena black. Occiput black; black pilose dorsally, white pilose ventrally. Oral cavity with slightly produced lateral margins. Frons black; short black pilose, except for bare triangular part posterior to lunula. Vertex black; black pilose. Eye appearing bare under low magnification. Antennal fossa about as wide as high. Antenna black, with basoflagellomere a little brownish; scape and pedicel black pilose; antennal ratio 3:1:6; basoflagellomere parallel-sided with narrowly rounded apex, with small sensory pit at 2/3 from base; arista slender, about 3/4 of length of basoflagellomere, appearing bare under low magnification.

Thorax. Black, postalar callus a little brownish. Postpronotum, scutum, postalar callus and scutellum short black pilose, except for two small patches of white pile along transverse suture and two small white pilose patches anterior to scutellum. Scutellum subrectangular, without calcars. Anepisternum a little convex, without sulcus, black pilose anterodorsally and along posterior margin. Anepimeron black pilose dorsally, white pilose ventrally. Katepisternum white pilose dorsally. Katepimeron bare. Calypter brownish yellow, halter blackish.

Wing: hyaline, with faint dark cloud between apex of costal cell and vena spuria , and with faint yellowish cloud on and posterior to pterostigma; microtrichose except bare on posterobasal 1/2 of cell br, posterobasal 1/2 of cell bm, anterobasal 1/2 of cell cup and mediobasal 1/5 of alula.

Legs: brownish black, except fifth tarsomeres of all legs yellow. Legs black pilose, except anterior four tibiae pale pilose and hind-tibia pale pilose on basal 1/2; pile on hind-tibia about as long as width of tibia. First tarsomere of hind-tarsus as long as 1/3 of length of hind-tibia, clearly wider than apex of tibia, twice as long as wide. Coxae and trochanters black pilose.

Abdomen. Black. Tergite 2 wider than thorax, widest point at around half the lentgh; tergites 3 and 4 strongly narrowing. Antetergite very large. Tergite 1 laterally mixed black and white pilose, bare medially. Tergite 2 black pilose laterally, white pilose anterolaterally and sublaterally; almost bare medially. Tergites 2 and 3 separated by a yellowish membrane of almost the median length of tergite 2. Tergites 3 and 4 fused, without a visible suture; black pilose dorsally and posteriorly, bare laterally. Sternite 1 bare, separated from sternite 2 by a membrane of about the width of sternite 1. Sternite 2 bare, laterally more than twice as wide as medially, separated from sternite 3 by a membrane of twice the median width of sternite 2. Genitalia as in fig. 237.

Female. As Van Doesburg (1927) already noted, the female is quite similar to the male, except for usual sexual dimorphy and wing pattern more pronounced.

Diagnosis. Stipomorpha lacteipennis shares its pilose posterior anepisternum and pilose dorsal part of the katepisternum only with S. litoralis . From this species it differs by the presence of a whitish fascia in the wing and by the male genitalia.

Notes. Shannon (1927) only described the male, based on two male syntypes. In the BMNH collection there is only one syntype left, which is hereby designated as lectotype in order to stabilize nomenclature. The holotype and a paratype of Microdon triangularis Curran have been examined and were found to be conspecific with S. lacteipennis Shannon.

Distribution. Known from Bolivia, Brazil, Peru, Surinam and Venezuela.

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 163 – 172. 163 – 164. Stipomorpha lacteipennis male (holotype). 163. habitus lateral; 164. head frontal. 165. Stipomorpha lanei male (Surinam, coll. RMNH), habitus dorsal. 166 – 167. Stipomorpha lanei female (French Guyana, coll. RMNH). 166. head frontal; 167. head dorsal. 168. Stipomorpha lanei female (holotype), habitus dorsal. Photo: American Museum of Natural History. 169 – 170. Stipomorpha litoralis male (holotype). 169. habitus dorsal; 170. habitus lateral. 171 – 172. Stipomorpha mackiei male (holotype). 171. habitus dorsal; 172. habitus lateral.

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).