BUFFALO SOCIETY OF NATURAL SCIENCES 181 



front edges ; fore and middle tibiae and the base of their tarsi 

 yellow, the tarsi becoming brownish towards their tips ; hind 

 tibiae and tarsi yellowish brown ; bristle at the base of the middle 

 tibiae rather slender; bristles of hind tibiae long; pulvilli of all 

 tarsi distinctly, though moderately enlarged. Tegulae, their 

 cilia and the halters pale yellow. Wings hyaline, scarcely tinged 

 with gray ; first vein not reaching quite half the distance to the 

 tip of the second. 



Described from three males from Hood River, Ore. Type 

 in the collection of J. M. Aldrich. 



A female from the same location may belong with these 

 males but the thorax is green and more shining, and the middle 

 tibiae have two large bristles on the fore surface ; this last char- 

 acter makes it doubtful whether they belong to the same species. 



This species is very much like quadratus but the face is 

 hardly as long as wide, the hind femora have long bristle-like 

 hairs below which are not found in quadratus, while that species 

 has noticeably long hairs above and this species has not; this 

 species has a shorter point at tip of the third antennal joint, 

 which is placed nearer the top of the joint than in quadratus. 



23 Diaphorus parmatus n. sp. 



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

 wide with silvery pollen, but appearing blackish when viewed 

 from in front ; palpi brownish when seen from the side, more 

 whitish when viewed from in front; antennae black, third joint 

 nearly as long as the first with a short but sharp point at the 

 center of the tip (Fig. 1) ; (Arista missing in the described speci- 

 men, in the drawing it is placed as it is supposed to belong, the 

 specimen showing where it has been broken off) ; front blue 

 with thick white pollen which conceals the ground color in 

 certain lights ; lateral and inferior orbital cilia white, the long 

 hairs on the lower part of the orbit white and bushy. Thorax 

 metallic green, the hind part and the scutellum more bluish ; 

 dorsum dulled with white pollen, pleurae covered with thick 

 white pollen. Abdomen green with long white hairs on the 

 sides at base and on the venter, and with six stout bristles at 

 tip ; hypopygium completely concealed. Coxae black ; fore pair 

 greenish and covered with white pollen, with long, coarse, white 



