PROC. ENT. SOC. WASH., VOL. 



21, NO. 



5, MAY, 1919 



tuberculate, situated at about the middle; tergites beyond fifth in female, 

 sixth in male, scarcely visible; hypopygidium in female reaching to apex 

 of abdomen; ovipositor exserted, slightly upcurved; male genital sheaths 

 exserted, narrow. 



Type. Atopognathus collaris, new species, described below. 



Atopognathus collaris, new species. 



Female. Length 5.5 mm.; antennae 5 mm. 



Head and thorax clothed with rather dense white pubescence; head polished, 

 face and clypeus very minutely punctate ; eyes about as long as their distance 

 apart at the antennae ; malar space about as long as basal width of mandible ; 

 thorax polished but so densely pubescent that it appears opaque; notauli 

 crenulate; propodeum polished; petiolar area about as long a rest of dorsal 

 surface; areola about two-thirds as broad as long, costulae very close to base; 

 abdomen polished; first tergite comprising about one-third total length,, 

 about twice as wide at apex as at base, postpetiole obscurely striate and 

 medially canaliculate, spiracles slightly behind middle; second tergite slightly 

 shorter than first; third, two-thirds as long as second; others very short. 



Black; clypeus rufous; mandibles stramineous, the teeth blackish; palpi 

 stramineous; antennae rufous at base, otherwise blackish with annulus 

 white; prothorax and tegulae rufous; wings hyaline, venation brown; legs 

 testaceous, front and middle trochanters and tibiae stramineous; hind tibiae 



FIG. I Atopognathus collaris CUSHMAN. a 'Front wing, b Side view 

 of abdomen, c Dorsal view of first and second tergites. d Front view 

 of head. 



