44 Journal New York Entomological Society. [Vol. vi. 



lacosomid^e. 



Lacosoma arizonicum, sp. nov. 



$ fore wing slightly incised at anal angle and roundedly produced at vein 3, the 

 apex rounded, not falcate ; hind wing rounded, somewhat sharply angled at anal 

 angle, and slightly excised between the veins. Body flesh color, shaded with rosy 

 pink on head and pectus ; antennae yellowish with long pectinations. Wings pale 

 brown, the basal half shaded with rosy pink, sparsely irrorate with brown. An ob- 

 scure discal dot on both wings, black, overlaid with white, and a narrow, very slightly 

 flexuous outer common brown line. Expanse, 29 mm. 



One S . Chiricahua Mts., Arizona (H. G. Hubbard). Type No. 

 3789, U. S. Nat. Mus. 



PYROMORPHID.E. 

 Acoloithus rectarius, sp. nov. 



Entirely black, the collar concolorous. Fore w'.ngs slightly bluish, hind wings 

 greenish. Expanse, 13 mm. 



One example, Chiricahua Mts., Arizona (H. G. Hubbard). Type 

 No. 3788, U. S. Nat. Mus. 



Possibly not distinct from Harrisina mexicana Schaus, which I have 

 not seen. 



NOTES AND DESCRIPTIONS OF OSCINIDiE. 



By D. W. Coquillett, Washington, D. C. 



The insects comprising this family belong to the group of acalyptrate 

 Diptera in which the auxiliary vein is imperfect or wanting, and the 

 crossvein, which usually separates the discal from the second basal cell, 

 is wanting, as is also the anal cell. The legs are short and rather 

 robust. The only other family possessing these characters is the Ephy- 

 dridse, but in these the head is usually much broader than high, the 

 aristse of the antennas are sometimes long pectinate on the upper side, 

 the sides of the face are usually provided with bristles and the oral 

 opening is often excessively large, none of which characters occur in 

 the Oscinidae. 



In studying up the extensive series of specimens contained in the 

 collection of the National Museum several new forms were met with, 

 and it was found necessary to make a few corrections and additions to 

 the genera given in Osten Sacken's catalogue. A large series of speci- 

 mens of Opetiophora straminea, the type species of this genus, collected 

 in Texas by Mr. E. A. Schwarz, shows that this genus is a synonym of 



