''Sphegina (Asiosphegina) atricolor'' is a species of hoverfly in the family Syrphidae found in

Myanmar Myanmar, ; UK pronunciations: US pronunciations incl. . Note: Wikipedia's IPA conventions require indicating /r/ even in British English although only some British English speakers pronounce r at the end of syllables. As John C. Wells, Joh ...

Etymology

The name comes from Latin 'atricolor', meaning 'black', referring to the general dark color of the fly.

Description

In male specimens, body length is 6.2 to 7.5 millimeters and wing length is 5.2 to 6.5 millimeters. The face is strongly concave with a weakly developed frontal prominence. The face is black; gena shiny brown or yellow; lunula shiny brown; occiput dull black; antenna dark brown; proleg and trochanter yellow; profemur mainly brownish, base and apex yellow; protibia yellowish, usually brownish medially; protarsus yellow,

tarsomeres The arthropod leg is a form of jointed appendage of arthropods, usually used for walking. Many of the terms used for arthropod leg segments (called podomeres) are of Latin origin, and may be confused with terms for bones: ''coxa'' (meaning hip, plur ...

4 and 5 black; mesoleg with coxa and trochanter yellow; mesofemur brown, basal 1/5 and apical 1/6 yellowish; mesotibia yellow, more or less developed brownish annulus on apical 1/2; mesotarsus yellow, tarsomeres 4 and 5 black; metaleg with coxa brown, trochanter yellow, simple; metafemur blackish, extreme base yellow; metatibia yellow, without apico-ventral tooth, apical 1/5 dark brown and an obscure dark annulus medially; metatarsus dark brown. The surstyli are strongly asymmetrical with only slightly asymmetrical superior lobes; part of the postero-ventral sternite IX is strongly asymmetrical; tergite IX is elongated and the cercus is narrow. The basal flagellomere is oval and the scutellum is semicircular and dorsally semi-shiny. No female specimens are known.

Related Species

''S. (A.) atricolor'' is similar to '' S. (A.) furva'', though it can be differentiated by tergite IX (shorter in ''S. (A.) atricolor'' than ''S. (A.) furva''), the dorsal lobe of right side surstylus (shorter than the medial lobe in ''S. (A.) atricolor'' and much longer than the medial lobe in ''S. (A.) furva''), and the two lobes at the dorsal margin on the left side surstylus (much lower in ''S. (A.) atricolor'' than in ''S. (A.) furva''. Both species are also similar to '' S. (A.) adusta'', but unlike this species they possess a transverse crest at the base of the lobe located sinistrolaterally at the posterior margin of male sternite IV. ''S. (A.) atricolor'' and ''S. (A.) furva'' resemble a number of Oriental and eastern

Palearctic The Palearctic or Palaearctic is the largest of the eight biogeographic realms of the Earth. It stretches across all of Eurasia north of the foothills of the Himalayas, and North Africa. The realm consists of several bioregions: the Euro-Sibe ...

Sphegina ''Sphegina'' is a genus of small, slender hoverflies. They are widespread throughout Eurasia and North America. In flight they seem to have long hind legs which they often carry hanging down, making them resemble sphecid or ichneumonid wasps. A ...

species due to the large subtriangular lobe posteriorly on the left side of male sternite IV.

References

Brachyopini Insects described in 2015 Diptera of Asia {{Brachyopini-stub