180 DIPTEROUS GENUS DIAPHORUS 



segments long, those at the tip a little longer and stouter ; hypo- 

 pygium small and its appendages concealed. Coxae black, the 

 fore pair somewhat greenish, with yellow tips and trochanters 

 and long white hairs on the front surface ; middle and hind pairs 

 with white pollen ; f emorra bright green with the extreme tips 

 yellow ; fore and middle pairs with long, black, bristle-like hairs 

 on the lower-front edge ; hind pair with rather long hairs above 

 and shorter hairs below ; fore and middle tibiae yellow ; hind 

 tibiae brownish black ; fore and middle tibiae without bristles 

 except the usual one near the base of the middle ones ; hind 

 tibiae with a number of bristles on the top, five or six of which 

 are longer than the rest, and one bristle near the base On the 

 outer s^le ; fore and middle tarsi brown and about equal to their 

 tibiae in lengtb ; hind tarsi black and about three-fourths as long 

 as their tibiae ; pulvilli of the fore tarsi only a little enlarged, 

 those of the middle and hind tarsi not at all enlarged. Halters 

 and the tegulae and their cilia pale yellow. Wings broad ; hya- 

 line, scarcely tinged with gray; veins black; first vein reaches 

 scarcely one-third of the distance to the tip of the second vein. 



Described from a single male which I took at Fort Erie, 

 Out., May 30th, 1911. Type in author's collection. 



22 Diaphorus occidentals n. sp. 



Male : Length 3-3.2 mm. Face wide, a little longer than 

 wide with silvery white pollen ; palpi brown when viewed from 

 the side, white when seen from the front ; antennae black, third 

 joint large with a short point, about a$ broad at the widest 

 part as long, nearly as long as the two basal joints together 

 (Fig. 11) ; front bluish green with white pollen which is thickest 

 below, about as wide as the face ; lateral and inferior orbital 

 cilia white, the white beard below the mouth long and bushy. 

 Thorax blue-green on the dorsum with white pollen ; pleurae 

 more blackish and covered with gray pollen. Abdomen green 

 with long white hairs on the sides at base and on the venter ; 

 ■bristles at the tip rather long ; hypopygium small, appendages 

 concealed except the central filiment which in the described 

 specimens is rather long and directed downward. Coxae black ; 

 the fore pair greenish with white pollen and long white hairs 

 on the front surface, their tips and trochanters yellow ; femora 

 :metallic green with yellow tips and long dark hairs on the lower- 



