V 



1920] Johnson — A Revision of the Species of the Genus Loxocera 17 



Loxocera coUaris Loew. 



This is usually smaller than L.fumipennis Coq., and readily dis- 

 tinguished by characters given in the above table. Specimens 

 from Washington and Oregon I cannot separate from those of the 

 eastern states, thus giving it a wider distribution than any of the 

 other species. Aside from the typical locality, District of Colum- 

 bia, there are specimens in the collection of the Boston Society of 

 Natural History from Liberty, Me. (J. A. Cushman); Medford, 

 Mass. (G. W. Barber); Salem, Mass. (A. P. Morse). Also from 

 Great Falls, Va., May 19 (N. Banks), in the Museum of Compara- 

 tive Zoology. 



Loxocera fumipennis Coq. 



Except for the uniform dark brown wings, the species resembles 

 L. cylindrica. It is more clearly related to the European L. elon- 

 gata than any of the other American species. Distribution, 

 Kansas, Texas and Colorado. 



Loxocera quadrilinea Walker. 

 The identification of this species from the description is hopeless. 



Pseudopsila new genus. 



This represents a group intermediate between the true Loxocera 

 and Psila. The former has the third joint of the antenna at least 

 five times as long as the second and exceeding the length of the 

 arista. The typical species of the genus Psila (P. fimentaria L.) 

 has an ovate rounded third antennal joint scarcely longer than the 

 second. In Pseudopsila the third joint is subcylindrical and about 

 three times as long as the second, the latter being relatively shorter 

 than in the typical Loxocera. Arista almost double the length of 

 the third joint. One pre-dorso-central, immediately in front of the 

 suture (these are easily broken and are present on but few of 

 the museum specimens), one post-dorso central just in front of the 

 scutellum, two supra alar and a small presutural bristle. Type, 

 Loxocera fallax Loew. 



Table of Species. 



1. Thorax entirely black fallax Loew 



Thorax yellow marked with black 2 



