DESCRIPTION OF THE SPECIES. 63 



blue. Antennae yellowish-red, the short third joint more brown- 

 ish-red. The narrow face ochre-yellow. Cilia of the inferior 

 orbit pale yellowish. Cilia of the tegulas black. Hypopygium 

 of moderate size, the basal half metallic-green or green-blue, the 

 apical half yellow ; the lamellae rather large and broad, with a 

 rather broad black border, fringed with black on the upper mar- 

 gin only ; jagged as usual, on the apical margin and beset with 

 crooked black bristles. Fore coxas entirely yellow, with a delicate 

 and short pubescence ; near the tip with black bristles. Middle 

 and hind coxae of the same color, still the former more or less 

 blackish at the basis. Femora and tibia? yellow ; hind femora 

 upon the front side before the tip with a stout bristle ; all femora 

 glabrous upon their underside. Fore and middle tibiae plain, 

 rather slender, moderately bristled. Hind tibiae very stout, 

 thickened upon the basal half and with a large glabrous spot 

 upon their hind side. Fore tarsi slender and nearly twice as long 

 as the tibiae ; the elongated, but plain, three first joints yellow, of 

 much decreasing length, the fourth joint deep black, short, broadly 

 flattened, triangular ; the fifth joint of the same shape, hardly some- 

 what longer than the fourth, deep black at the basis, snow-white 

 at the broad tip ; the ungues, pulvilli and empodium inserted at 

 its lower end are of the ordinary structure ; at the upper end there 

 is a distinct elliptical laruel, which, like the joint itself, is deep 

 black at the basis, and snow-white at the tip. Wings grayish- 

 hyaline, rather narrow towards the basis ; near the tip of the first 

 longitudinal vein there is but a slight trace of a swelling of the 

 costa ; the latter, however, is rather stout from this point to the 

 tip of the wing ; .the last segment of the fourth longitudinal vein 

 is only moderately inflected upon its middle. 

 Hob. District Columbia. (Osten-Sacken.) 



32. D. ruficornis LOEW. . Viridis, humeris concoloribus, anten- 

 nis rufis, oculorum ciliis inferioribus albis, tegularum ciliis nigris, pedi- 

 bus flavis, articulo tarsorum antieorum ultimo dilatato, alarum vena 

 longitudinal! quarta non fracta. 



Green, including the humeral callosities ; antennae red ; cilia of the inferior 

 orbit white ; cilia of the tegulae black ; feet yellow ; last joint of the fore 

 tarsi enlarged ; fourth longitudinal vein not broken. Long. corp. 0.19. 

 Long. al. 0.18. 



SYN. Dolichopus ruficornis LOEW, Neue Beitr. VIII, 21, 21. 



