PROC. ENT. SOC. WASH., VOL. 24, NO. 6, JUNE, 1922 145 



Habitat. Castro, Parana. 



Type Cat. No. 25571, U. S. N. M. 



Allied to C. nigristigmellus Hampson. 



Chilopsis dorsipunctellus, new species. 



Male. Head and body light buff; at base of abdomen dorsally a large fuscous 

 brown spot with brownish shading on two following segments. Fore wings light 

 buff and with some dark gray irrorations; no point at end of cell; terminal black 

 points on interspaces; a slightly darker postmedial line outangled below costa 

 then oblique and wavy to before middle of inner margin; a faint subterminal 

 dentate line; cilia whitish buff. Hind wings glossy light buff; a terminal dark 

 line between veins 5 and 6. Wings below light buff; the discal space on hind 

 wing more thinly scaled, whiter and faintly opalescent; traces of a postmedial 

 darker line. 



Expanse 40 mm. 



Habitat. Yahuarmayo, Peru. 

 Type. Cat. No. 25569, U. S. N. M. 



^/ Doratoperas biumbrata, new species. 



Female. Head and body above ochraceous buff, underneath light buff; legs 

 ochraceous buff. Fore wings light buff; a few scattered light brown scales; a 

 diffused light pinkish cinnamon shade from apex to inner margin at two-thirds 

 from base; a similar shade from its inner edge at vein 5 to middle of inner margin, 

 the space between suffused with ochraceous buff; minute terminal cinnamon 

 points on interspaces; cilia ochraceous buff. Hind wings whitish, the inner 

 margin with light buff hairs. The underside of hind wing shows a faint sub- 

 terminal shade from costa to vein 5. 



Expanse 65 mm. 



Habitat. Volcan de Santa Maria, Guatemala. 



Type. Cat. No. 25572, U. S. N. M. 



Near D. spectabilis Felder which I do not consider the same 

 as D. atrosparsellus Walker; these two species were united by 

 Hampson. 



A NEW GENUS OF TWO-WINGED FLY WITH MANDIBLE-LIKE 



LABELLA 



BY J. M. ALDRICH. 



In the Dipterous family Dolichopodidae the adult insects are 

 well known to be predaceous; they capture the smaller and 

 weaker flies, and in their favorite haunts at the edge of water 

 they pick up small Chironomid and other dipterous larvae, as 

 well as oligochaete worms. These various animals they hold 

 within or partly within the labella while extracting the juices. 



In the present paper a new form is reported, in which the 

 labella have undergone a striking specialization, the outer lobe 

 forming an organ like the mandible of a carnivorous beetle. 



