BUFFALO SOCIETY OF NATURAE SCIENCES 183 



knee on the middle tibiae ; bristles of the hind tibiae large. Halt- 

 ers and tegulae pale yellow, the cilia of the latter white but in 

 certain lights' almost black. Wings hyaline, scarcely tinged with 

 gray ; first vein reaching two-thirds the distance to the tip of 

 the second. 



Female : Differs from the male in having the palpi larger ; 

 the face with a transverse suture below the middle, third joint 

 of the antennae small and the color of the pleurae and scutellum 

 green, without a trace of blue. 



Described from one male from Brookings, S. D. Type in 

 the collection of Prof. J. M. Aldrich. 



Separated from related species by the peculiar paddle- 

 shaped antennae. 



25 Diaphorus repandus n. sp. 



Male : Length 3.5 mm. Face wide, covered with white 

 pollen, the green ground color showing through in most lights ; 

 palpi yellowish brown with white pollen which gives them the 

 appearance of being white towards their edges ; front bluish green 

 with thin yellowish pollen ; antennae black, the third joint very 

 short, slightly flattened at tip (Fig. 3) ; arista apical; cilia of the 

 lateral and inferior orbit white; hairs on the lower part of the 

 head rather long. Dorsum of the thorax green with yellowish 

 pollen ; pleurae and scutellum more blue-green, the former with 

 white pollen. Abdomen green with slight coppery reflections and 

 with considerable white pollen ; when viewed in the right light it 

 shows a dark central line ; bristles at the tip of the abdomen 

 small ; hypopygium small, its appendages scarcely visible. Coxae 

 black with their tips and trochanters yellow, covered with white 

 pollen ; fore coxae with short white hairs on the front surface and 

 black bristles at tip ; femora dark green, fore and middle pairs 

 broadly and hind pair narrowly yellow at tip ; tibiae and base of 

 fore and middle tarsi yellow ; fore and middle tarsi brown from 

 the tip of the first joint and the hind tarsi brown from the base ; 

 pulvilli of fore tarsi only slightly enlarged ; fore and middle 

 femora with a few bristle-like hairs at tip ; fore and middle 

 tibiae with a bristle near the knee on the front side ; hind tibiae 

 with a bristle at first and another at second, third on the 

 outside, and three smaller ones on the upper side ; fore and mid- 



