Ontomyia gen. n.

Etymology: Gr. Ontos = that which has existence; myia = fly.

Type species: Oratostylum ricardoi (Londt, 1985), comb. n., by present designation. Generic diagnosis:

Antennal style composed of 2 elements, one basal segment and a terminal ‘seta-like’ sensory element (Figs 17-18) (the length of the basal segment is variable, being neither cylindrical and distinct as in other mentioned genera nor merely a pit enclosing a ‘seta-like’ sensory element as in Microstylum); postpedicel as in Figs 17-18, longer than scape and pedicel combined; palpi less than half as long as proboscis, proboscis strong and long; facial swelling pronounced in lower and upper parts; proepisternal setae weak, pronotal setae well-developed and strong; basal postpronotal setae strong; dorsocentral setae well-developed, 2-4 pairs anterior of transverse suture; metathoracic coxae with row of 3-6 distinct macrosetae; cell r 5 open; cell m 3 closed with a short stalk; T1-4 with strong dorsolateral macrosetae (in groups of 2-6); T6-7 with weak and erect setae in ♀; T8 nearly as long as T 7 in F; ♂ terminalia bulbous, epandrium laterally expanded, gonocoxites of complex shape, hypandrium triangular without a distal projection. Note: Female (Figs 5-7) and male (Figs 2-4) terminalia of type species as illustrated.