Toxomerus anthrax (Schiner)

Mengual, Ximo, 2011, Black-tie dress code: two new species of the genus Toxomerus (Diptera, Syrphidae), ZooKeys 140, pp. 1-26 : 7-8

Toxomerus anthrax (Schiner) Figures 1529

Mesogramma anthrax Schiner 1868: 350. Type Locality: South America [ST 3♂, 3♀, NMW].

Mesogramma vitrescens Hull 1930: 142. Type locality: Colombia, Magdalena, Aracataca [HT ♂, ANSP].

Mesogramma anthrax var. flammaria Hull 1943: 27. Type locality: Honduras, Puerto Castilla [HT ♂, unknown].

Differential diagnosis.

Male and female with medial black facial vitta, but in males does not continue laterad or dorsad antennal bases. Scutum black laterally except pos tpronotum yellow and notopleuron sometimes with a small yellow vitta sublaterally, not on the most lateral margin. Wing extensivey microtrichose with small bare area on both sides of vein M on the basal portion of cell bm, and costal cell bare very basally or along vein SC (posterior margin). Abdomen black, terga 3-5 sometimes dark brown to yellowish-orange, with or without yellow lateral margins; shiny, without pollinose markings.

Toxomerus anthrax is similar to Toxomerus circumcinctus but the last has the notopleuron entirely yellow and postalar callus yellowish and the scutellum black with a well-defined broad yellow margin. Male genitalia are different.

Length

(5): body, 6.0-7.2 (6.6) mm; wing, 4.8-5.5 (5.2) mm.

Distribution.

Costa Rica, Venezuela, Colombia, Ecuador, Guyana*, Peru*.

Material examined.

2♂ syntypes, 28♂ 17♀.