168 DIPTEROUS GENUS DIAPHORUS 



2 Diaphorus basalis n. sp. 



Male : Length 3.75 mm. Face snbquadrate and rather 

 deeply depressed, black with thin white pollen ; proboscis black ; 

 palpi yellowish; eyes touching or nearly so on the center of the 

 front, leaving a small triangle above the antennae ; antennae 

 small, black, third joint very small, rounded with a dorsal arista ; 

 lateral and inferior orbital cilia white. Thorax metallic green 

 dulled with gray pollen ; pleurae greenish black with white pol- 

 len. Abdomen dark metallic bronze with the second and part 

 of the third segment yellow, still a narrow hind margin of the 

 second dark ; hairs of the abdomen black, tip with six or seven 

 strong bristles ; hypopygium conspicuous with long spatulate 

 lamellae (Fig. 13), which are brown with the tip more blackish 

 and fringed with long brown hairs. Coxae and femora black ; 

 the tips of the fore coxae, their trochanters, and the apical half 

 of the fore and middle femora yellow ; all tibiae and fore and 

 middle tarsi yellow, these tarsi brownish towards the tips ; ex- 

 treme tips of hind tibiae and their tarsi brown ; all femora ciliate 

 below with long brown hairs, those on the middle pair shorter 

 and more bristle-like, hind femora also with rather long hairs 

 above ; fore tibiae with long hairs ; middle tibiae with a bristle 

 near the knee on the front side and two or three small ones 

 below ; hind tibiae with one bristle near the base on the outer- 

 upper edge and a row of bristle-like hairs and several larger bris- 

 tles on the upper-inner edge ; fore tarsi about one and a half 

 times as long as their tibiae and with their pulvilli much enlarged 

 and lengthened, being fully as long as the fifth joint, there are 

 a few long hairs at the tip of the fifth joint; pulvilli of the mid- 

 dle and hind tarsi but little enlarged ; middle tarsi a little longer, 

 and the hind tarsi scarcely as long as their tibiae. Halters 

 and tegulae yellow, the latter with black cilia. Wings tinged 

 with brown ; first vein reaching about one half the distance to 

 the tip of the second vein. 



Described from one male taken by Mr. Nathan Banks, at 

 Glencarlyn, Ya. Type in Mr. Banks' collection. 



This species is closely related to D. oculatus Fall, from 

 Europe, the third joint of the antenna is the same, as is the gen- 

 eral color, but it differs in having no bristles on the fore tibiae 

 and in the arrangement of the bristles of the other legs. The 

 lamellae of the hypopygium are much like those of D. lamellatus 

 but much more slender. 



