18 Psyche [February 



2. Dorsum without lateral margins of black 3 



Dorsum with lateral margins of black 4 



3. Humeri and upper half of the pleura black .... angustata Cress. 

 Anterior margin, pleura, metanotum and a narrow dorsal line 



black perpolita sp. nov. 



4. With broad lateral margins only, upper half of the pleura 



black bivitatta Loew 



With a broad anterior and lateral margins, upper half of the 

 pleura black collaris Loew 



Pseudopsila fallax (Loew). 



Loxocera fallax Loew, Cent., IC, 89, 1869, 



In a note Loew refers to this species as being intermediate be- 

 tween Loxocera and Psila. It is readily distinguished by having 

 both the thorax and abdomen shiny black. It has the following 

 distribution: Mt. Washington, 4,000 feet. Glen House and Inter- 

 vale, N. H.; Auburndale, Cohasset and Fall River, Mass.; Kaater- 

 skill and Axton, N. Y. Type locality, Canada. 



Pseudopsila perpolita sp. nov. 



Head yellow, upper half of the occiput and vertical triangle 

 black; third joint of the antennae black about three times as long 

 as the second; aristoe white. Thorax including the scutellum yel- 

 low, with short yellow hairs, anterior margin, a stripe occupying 

 the greater portion of the pleura and the metanotum, shiny black. 

 A very narrow blackish dorsal line is also present, which is usually 

 obsolete behind the suture. One pre-dorso-central just in front 

 of the suture, and one post-dorso-central in front of the scutellum, 

 the alar bristles are wanting. Abdomen shiny black, with short 

 yellow hairs, ovipositor yellow. Halteres white. Wings hyaline, 

 veins light yellow, wings noticeably large for the size of the fly, 

 anterior cross vein slightly nearer the base of the discal cell than in 

 P. fallax, i. e., less than one-third the length of the cell. Legs 

 light yellow, tips of the tarsi brown. Length 4 mm. 



Seven specimens, six females. Center Harbor, N. H., September 

 10, 1914 (C. W. Johnson), and one male. Liberty, Me., September 

 9, 1915 (Dr. J. A. Cushman). Holotype and three paratypes in the 

 collection of the Boston Society of Natural History, two paratypes 



