280 AMERICAN DIPTERA. 



16. DEROMYIA Philippi. 

 Deromyia angustipeiinis Loew. 



Numerous species from Glen Sioux Co., and Lincoln, Nebraska. 

 Common in the eastern and northern parts of the State. 



l>eroiiiyia plalyplera Loew. 



Three males and three females from Peru and Union, Nebraska. 

 The females agree with the description of the male, except that they 

 are much lighter, including the wings. This seems to be the only 

 difference however. Formerly recorded fron) a male from Illinois. 



18. COPHURA Osten Sackeu. 

 Cophiira cri!«tala Coquillett. 



A male specimen which I would refer here, although upon com- 

 paring it with a male and a female from Colorado it it quite differ- 

 ent in general appearance. The Colorado specimens differ from the 

 Nebraska specimen by having longer and denser hair, a more promi- 

 nent gibbosity of the face and a denser mystax, which extends nearer 

 to the base of the antennae. All of the specimens instead of having 

 four marginal bristles on the scutellum have about eight weak mar- 

 ginal bristles. All the other characters agree with the description. 

 The species must be quite variable. 



19. CEROTAI»fIA Schiuer. 



Cerotainia atrata n. sp. 



9 . Length 7 luiu. Black, shining, finely punctate, nearly glabrous. Front 

 broad deeply excavated, covered with grayish pollen and whitish hairs, ocelli on 

 a prominence. Face flat in profile, covered with yellowish-gray pollen, denser 

 and more grayish on the sides, mystax thin, composed of a few yellowish-white 

 hairs on the oral margin, sparse white pile extending to the antennae, bristle-like 

 hairs on the occiput yellowish, scant beard and hair on the orbital margin white. 

 Antenna black, first and third joints equal, second short, first two joints covered 

 with black hair. Eyes disciform, with enlarged facets in front. Thorax and 

 scutellum finely punctate, covered with very short, fine, dense, yellowish-red 

 pile, nearly glabrous to naked eye. Mesopleura with yellowish-red pile, slerno- 

 pleura with whitish pile and grayish pollen. Halteres lemon-yellow, and fan- 

 like row of hairs in front white. Abdomen black, shining, coarser and more 

 deeply punctured than the thorax, covered with fine, short, yellowish-red pile, 

 which is longer and somewhat whitish on the lateral margins of the segments. 

 Legs black, tibiae and tarsi dark red, on the upper side and nearly all of the hind 

 tibiae brownish. Pile of the legs white. Wings uniformly blackish, veins at the 

 end of the distal end of the discal and fourth posterior cells continuous in the 

 same straight line, first posterior cell not narrowed, second somewhat narrowed, 

 fourth posterior and anal cells closed and petiolate. 



