''Sphegina (Asiosphegina) bilobata'' is a species of

hoverfly Hover flies, also called flower flies or syrphid flies, make up the insect family Syrphidae. As their common name suggests, they are often seen hovering or nectaring at flowers; the adults of many species feed mainly on nectar and pollen, while ...

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 Wells explai ...

. It's set apart from other species by its general pale yellowish color with three black longitudinal stripes on the scutum combined with the infuscated pattern at cross veins on the wing. The male sternite IV with its symmetrical pair of short spinose lobes posteriorly is quite distinct.

Description

In male specimens, body length is 7.5 to 7.8 millimeters and wing length is 6.0 to 6.2 millimeters. The face is yellow, strongly concave with a strongly developed, brownish frontal prominence. The gena is shiny yellow; frons and vertex dull black; lunula yellow; occiput dull black; antenna entirely yellow; thorax dull yellow or yellowish; scutellum yellow or yellowish brown, shiny, trapezoid; pro- and mesoleg yellowish; protarsus and tarsomere 5 on mesotarsus brown; metaleg with coxa brownish, trochanter yellow, femur yellow with the apical 1/6 brownish and a ventrally interrupted annulus on the basal 1/2 weakly brownish, tibia with an apico-ventral tooth, colour yellow except the apical 1/5 brown and an annulus on the basal 1/2 brownish, tarsus brown. The wings are hyaline with yellowish stigma and brownish pattern. The basal

flagellomere Antennae ( antenna), sometimes referred to as "feelers", are paired appendages used for sensing in arthropods. Antennae are connected to the first one or two segments of the arthropod head. They vary widely in form but are always made of one o ...

is enlarged, nearly 1.5 times as long as broad, and the

arista Arista may refer to: Organizations *Arista Networks, a software defined networking company *Arista Records, an American record label, division of Sony Music **Arista Nashville, a record label specializing in country music *Arista (honor society) ...

is short and pilose. Female specimens are much the same except for normal

sexual dimorphism Sexual dimorphism is the condition where the sexes of the same animal and/or plant species exhibit different morphological characteristics, particularly characteristics not directly involved in reproduction. The condition occurs in most an ...

; body length is 8.4 millimeters and wing length is 7.5 millimeters. Protarsus yellow with tarsomere 5 obscure brownish yellow. Metaleg paler than in the male; femur almost entirely yellow, tibia without a distinct apico-ventral tooth, with brownish sub-basal annulus and apex; tarsus brownish dorsally. The abdomen is entirely yellow.

References

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