Spirobolomyia, Townsend, 1917

Genus Spirobolomyia View in CoL

Tegula orange or yellowish; postalar wall setulose; third costal sector of wing bare ventrally; male mid-femur with a ctenidium of rounded spines (circular cross section); male hind tibia with apical postero-ventral seta well differentiated; male abdominal ST5 cleft with subparallel sides; cercal prong with a backwards bend in distal or subapical position; cercal prong with spine-like setae on dorsal surface; cercal prong with a proximal hump on dorsal surface; cercal prong with a sinuous lateral margin (dorsal view); postgonal apodeme elongated*; phallus with a distinct hinge between basi- and distiphallus; paraphallic blinkers rounded, with a membranous ventral tube-like process*; paraphallus with a strong keel on dorsal wall*; paraphallus with a beak-like projection arching over the juxta*; distiphallus surrounding the acrophallus, styli visible in lateral view; vesica bulbous; acrophallus formed of a capitis, lateral styli and a median stylus; lateral styli tube-shaped, with an outlet; lateral styli partially or entirely exposed in profile; lateral styli elongated; capitis flat and simple; median stylus with a distinct opening; median stylus greatly elongated; median stylus curved; juxta entirely separated from acrophallic structures; juxta straight; distal margin of juxta without spine-like processes; female abdominal ST6–8 fused; female abdominal T6 with the median part of the posterior margin devoid of setae, projecting and tongue-like.