AMERICAN DIPTERA. 325 



macerinus, but certainly different, yet too poorly preserved 

 for describing. 



I am here enabled to mention the male for the first time 

 through the kindness of Prof. C. W. Johnson, who has kindly 

 loaned me a specimen. He says that this species seems to be 

 quite common at Lehigh Gap, Penn. 



I regret that we must use the specific term macerinus in 

 place of gibbus. Walker's description, while not as good as 

 Loew's, refers to this insect. 



Heteropogon nigripes. 



Heteropogon nigripes Jones, Trans. Am. Ent. Soc, XXXIII, 279, 

 1907. 

 "Length 9 mm. — Near H. lautus Loew. Head broader than high, 

 front but slightly excavated; front and face white pruinose, covered 

 with long white hair, above the mouth and near the ocellar prominence, 

 black. Face flat, slightly convex below, wide. Antennas black; first 

 and second joints equal; third slightly longer than the first two to- 

 gether; style slender, about two-thirds the length of the third joint. 

 Thorax black (slightly greased in the specimen at hand) , covered with 

 long, light colored pile; pleura whitish pruinose, covered with long 

 white pile; scutellum similar in color to the thorax, but with a brownish 

 tinge, covered with long white pile and a marginal row of weak bristle- 

 like hairs, dark at base and white at apex. Halteres dark brown or 

 black; stem slightly lighter; fan-like row of hairs in front white. 

 Abdomen black, polished; tergum covered with very fine, short, sparse, 

 light colored pile; lateral margins with long white pile; posterior lateral 

 margins of first six segments with a white pruinose spot. Legs black; 

 covered with long light colored pile, weak bristles of tibiae light col- 

 ored; pile of tibiae and tarsi yellowish, shorter and denser than that 

 of the femora. Wings hyaline; veins at base of submarginal, first, 

 second, fourth, fifth, posterior and discal cells, clouded with black." 



Type. — University of Nebraska. A single female specimen. 



Habitat. — Monroe Canon, Sioux Co., Neb. (L. Bruner). 



Mr. Jones states that this species can be separated from H- 

 lautus by its entirely black legs, and the difference in the 

 pilosity of the legs. I have never seen this species, but it must 

 very closely resemble johnsoni except for its clouded wings. 



Heteropogon patruelis. 



Anisopogon patruelis Coquillett, Can. Ent., XXV, 21, 1893. 

 " tf 9- — Length 13-16 mm. — Same as the following description of 

 rubidus, with these exceptions: — Head, antenna?, thorax, scutellum 



TRANS. AM. ENT. SOC, XXXV. AUGUST, 1909 



