134 ENTOMOLOGICAL NEWS [xxxii, '21 



Two New Species of the Genus Coenosia (Antho- 



myiidae, Diptera). 



By J. R. MALLOCH, Urbana, Illinois. 



The two species described herein have been in my possession 

 for two years, but I delayed printing the descriptions as I 

 knew that Professor Stein had a large paper on the family in 

 the press and as I knew that much of his material had been 

 supplied by western collectors I assumed that there was con- 

 siderable probability he had the species and I did not want to 

 create unnecessary synonyms. The descriptions are now pre- 

 sented, as he had apparently no specimens of the species. 



Coenosia aliena sp. n. 



9 . Black, slightly shining, densely gray pruinescent. Inter-frontalia 

 black, less densely gray pruinescent than orbits ; antennae and palpi 

 black. Thorax with three linear brown vittae. Abdomen with the 

 paired dorsal spots not very conspicuous, large, forming two almost 

 continuous vittae. Legs black, trochanters, apices of femora and the 

 tibiae reddish yellow. Wings clear. Calyptrae white. Halteres yellow. 

 Arista pubescent; third antennal segment extending three-fourths of 

 the distance to mouth-margin. Presutural acrostichals in an irregular 

 series ; lower stigmatal bristle directed ventrad. Tibial bristles as in 

 lata Walker, but there are in the type two additional bristles on antero- 

 dorsal surface of hind tibia, one above and one below the normal bris- 

 tle, both weaker than the median one. Otherwise as lata. Body length, 

 3.5 mm. 



Type, Gallatin, Montana, August 22, 1917. 



* 



Coenosia anthracina sp. n. 



9 . Similar in color to the foregoing, the entire body black, shining, 

 without distinct pruinescence and without distinct dorsal abdominal 

 spots. Legs black, bases of tibiae reddish. Halteres yellow. 



The species structurally resembles fratema Malloch and the principal 

 differences lie in the color of the interfrontalia. In fraterna the inter- 

 frontalia is almost as densely gray pruinescent as the orbits, while irt 

 anthracina it is brownish yellow when seen from in front and velvety 

 black when seen from behind. The thorax and abdomen in fraterna 

 are rather densely gray pruinescent and the median bristles on the 

 apical and preapical abdominal tergites are much stronger than in 

 anthracina. Body length, 2-2.5 mm. 



Type, Gallatin County, Montana, August 15, 1912, 5400 

 feet elevation. Paratype, Unita National Forest, Utah, August 

 21, 1917, 8000 feet elevation (J. Silver). 



Types in collection of Illinois Natural History Survey. 

 Paratype in collection of U. S. Bureau of Biological Survey. 



