182 DIPTEROUS GENUS DIAPHORUS 



hairs on the front surface ; femora metallic green with yellow 

 tips ; fore and middle tibiae yellow ; hind tibiae and tarsi brown ; 

 fore and middle tarsi brownish almost from the base and with 

 their pulvilli considerably enlarged, those of the fore tarsi largest ; 

 all femora with bristly hairs on the lower front edge ; middle 

 tibiae with the usual bristle near the base ; hind tibiae with long 

 brownish hairs and rather long bristles ; hind tarsi also hairy and 

 with the first joint nearly as long as the two following joints. 

 Halters and tegulae pale yellow, the cilia of the latter white, how- 

 ever in certain lights against a white background they may ap- 

 pear brown. Wings hyaline ; first vein reaches about two-fifths 

 of the distance to the tip of the second. (The costa in the de- 

 scribed specimen is bent at the tip of the first vein in both wings 

 but this may^be accidental). 



Described from one male labeled "Calif.' Coquillette." Type 

 in the collection of Prof. J. M. Aldrich. 



Separated from related species by the shield-shaped third 

 antennal joint. 



24 Diaphorus remulus n. sp. 



Male : Length 2.7 mm. Face wide with silvery pollen but 

 appearing black when viewed from in front ; palpi rather small 

 with the extreme base brown ; front green with white pollen on 

 the lower part, a litttle wider than the face ; antennae black, third 

 joint a little longer than the first, widest near the base, broadly 

 rounded at tip (Fig. 2); arista subapical ; lateral orbital cilia 

 whitish. Dorsum of the thorax green, dulled with gray pollen ; 

 pleurae and scutellum more blue-green, the former with white 

 pollen. Abdomen green with whitish pollen which leaves a 

 darker central line when viewed from behind ; hairs of the ab- 

 domen rather long, black above, white below ; bristles at the tip 

 rather long ; hypopygium small with its appendages scarcely vis- 

 ible. Coxae black, the fore pair greenish with white pollen and 

 long white hair on the front surface, their tips and trochanters 

 pale yellow ; femora metallic green with yellow tips and with 

 a row of delicate hairs on the lower front edge, those on the 

 hind pair stouter; tibiae and fore and middle metatarsi yellow; 

 fore and middle tarsi brown from the tip of the first joint ; tips 

 of hind tibiae and hind tarsi brownish; the usual bristle near the 



