PSILOPUS. 269 



whitish; the black. bristles before the incisures are not remarkably 

 long ; the bristle-like hairs at the extreme tip of the abdomen are 

 rather long. The small hypopygium is black, with extremely 

 small black appendages. Coxa? black, dusted with white, the fore- 

 most with a white pubescence and a few black bristles. Femora 

 black with a green reflection ; the anterior ones light yellow at the 

 extreme tip ; upon the under side of all there is a delicate, erect, 

 rather sparse pubescence of medium length. Tibiae yellow ; the 

 hindmost colored with blackish-brown to a rather considerable 

 extent at the tip. Fore tibia? upon the upper side with about four 

 short black, minute bristles, upon the hind side with about six still 

 shorter ones. Middle tibiae upon the first half of the hind side 

 with three not very long black bristles ; a perceptibly longer bris- 

 tle is to be found upon the first quarter of the front side, another 

 near its end ; immediately before the end on the under side an 

 unusually long, straight, diverging, black bristle assumes the shape 

 of a rather striking spur of the tibia. On the hind tibiae, besides 

 the black bristles inserted at the tip, there is but one bristle de- 

 serving to be noticed, upon the first third of the outside. Fore 

 tarsi slender, somewhat longer than the tibia? ; their first joint 

 yellow, only at the extreme tip brownish-black, nearly once and a 

 half the length of the following taken together ; the latter are 

 brownish-black; from the second to the fourth of rapidly decreasing 

 length, the fifth as long as the fourth. There are no bristles nor 

 any unusual pubescence on the fore tarsi. Middle tarsi brownish- 

 black, considerably shorter than the tibiae ; their first joint about 

 once and a quarter the length of the following taken together, its 

 whole length upon the under side fringed rasp-like with short black 

 bristles, crooked downwards, and inserted in a row on both sides ; 

 the four following joints of decreasing length. Hind tarsi black, 

 hardly two thirds of the length of the tibiae ; their first joint little 

 longer than the following taken together; the second to fourth 

 joint of rapidly decreasing length ; the two last joints of an equal 

 length, somewhat flattened. Halteres yellowish with blackish 

 peduncle ; tegulae with black cilia. Wings hyaline with black 

 veins ; the end of the first longitudinal vein is a considerable dis- 

 tance before the middle of the wing ; the anterior branch of the 

 fourth longitudinal vein diverges from it at an angle which is very 

 nearly a right one, and turns then arch-like towards the margin, 

 which it reaches rather far before the apex, quite near the tip of 



