VOL. 76 TWO-WIKGED FLIES OF THE GEXUS COELOPA ALDEICH 5 



COELOPA NEBULARUM, new species 



Coelopa frigida Coquiluett, Dipt. Commander Ids., 1899, p. 345 (not of Fallen, 

 not of Fabricius) ; Proc. Wash. Acad. Sci,, vol. 2, 1900, p. 460. — Malloch, 

 North American Fauna, No. 46, 1923, p. 214, pi. 12, fig. 1. 



Coelopa nitidula Coquillett, Proc. Wash. Acad. Sci., vol. 2, 1900, p. 460 (net 

 of Stenhammar). 



Coquillett reported the species from the Commander Islands and 

 Kodiak Island, as fiigida ; and as I identify the specimens he also re- 

 corded a specimen from Kodiak Island as nitidula. 



Male. — ^Differs from gravis ., which is so widespread that it rnay 

 well be used for comparison, principally by the character given in 

 the key, the posterior part of the abdomen being much more bristly 

 above and on the sides, and also less flattened. 



Female. — The legs are almost invariably blackish, while in a dozen 

 females of gravis they are uniformly reddish yellow. 



Length, 3.5 to 6.2 mm. 



Described from 15 males and 29 females, mostly from the Pribi- 

 lof and Commander Islands in Bering Sea. From the former group, 

 19 of both sexes, including type and allotype, are from St. Paul 

 Island (E. A. Preble, G. D. Hanna, A. G. Whitney), in 1914-1917; 

 while 7 are from St. George Island (Hanna), June 6 and 14, 1914. 

 From the Commander Islands (palaearctic), a male and two fe- 

 males (Stejneger) are from Bering Island, and a female (Barrett- 

 Hamilton) is from Copper Island. One of the Stejneger females is 

 from the early collecting in the eighties. A male and a female were 

 collected by the Harriman Expedition (Kincaid) on Kodiak Island, 

 in 1899, and a male from the same island (Hine) in 1917. Also two 

 males and nine females from Katmai, Alaska, collected by Prof. 

 J. S. Hine in 1917, and lent by him for study. 



Ty^e.— Male, Cat. No. 41859, U.S.N.M. 



COELOPA STEJNEGERI, new species 



Coelopa frigida Coquillett, Dipt. Commander Ids., 1S99, p. 345 (not of 



Fabricius). 

 Coelopa eximia Malloch, N. Amer. Fauna, No. 46, 1923, p. 213, pi. 14, fig. 25 



(not of Stenhammar). 

 Coelopa parvula Cole, Proc. Cal. Acad. Sci., vol. 11, 1921, p. 174 (not of 



Haliday). 

 Coelopa nitidula Coquillett, Dipt. Commander Ids., 1899, p. 345 (not of 



Haliday). 



Coquillett reported the species from the Pribilof and Commander 

 Islands as frigida and nitidtda; Cole reported it from the former as 

 parvula; and Malloch as eximia. The Commander Islands are in the 

 palaearctic region, being on the western side of the North Pacific. 



Male. — Black and rather shining; front opaque except the ocellar 

 triangle and an upper border to the eye, all the opaque portion with 

 erect hair of considerable length; the frontal bristles variable, 



