310 Professor Aldrich on the 



stripe aboTe the base of each wing, before and below this a spot 

 with a silvery reflection when viewed from above ; pleuras dark 

 green, in part black, with grey dust. Cilia of tegulge black, 

 halteres yellow. Abdomen bright green above, the sides below 

 white-dusted, the hairs everywhere black and rather coarse ; at 

 the tip of the abdomen are two bristles, as long as two segments ; 

 hypopygium blackish-green, the lamellae rounded, yellow, with 

 pale brown margin fringed with lyellow bristles. Fore and hind 

 coxse yellow, the former with very long black bristles and black 

 hairs, the latter with a large and a smaller lateral bristle close 

 together ; middle coxae brown on the basal half ; femora and tibiae 

 light yellow, the fore tibiae with a row of irregular but distinct 

 bristles on the front side ; the fore tarsi are pale to the extreme 

 tip ; middle and hind tibiae with erect and conspicuous bristles ; 

 they are gradually infuscated from tip of first joint. Wings 

 rather narrow, hyaline, the fourth vein converging towards the 

 third, toward the tip close to, and nearly parallel with it. 



$ . Face nearly twice as wide, white ; no long bristles at tip of 

 abdomen ; otherwise substantially like the male. 



Length 1'6 mm.; of wing, the same. 



One male, one female. 



PCECILOBOTHRUS. 



Mik. Dipt. Untersuch., 1878. 



1. Poecilohothrus unguiculatus, n. sp. (PI. XI., fig. 101, 

 last joint of ^, front tarsus. PL XII., fig. 116, 

 tip of wing.) 



^ . Face very wide, below the suture with two lateral con- 

 vexities separated by a narrow groove ; colour dark brownish- 

 green, with dense brown pollen, which appears lighter in certain 

 directions. Palpi brown, with yellow tips ; proboscis large^ 

 blackish. Front concave, shining violet in the middle, about the 

 edges blackish. Antennae brownish-black, the under part a little 

 reddish ; third joint ovate, a little pointed in an upward direction ;. 

 arista nearly basal, short, distinctly feathered. Cilia of the inferior 

 orbit white. Thorax bronze-green, not very shining ; acrostichal 

 bristles in two rows ; the two rows of interior dorsal bristles (Mik) 

 are inserted upon slender longitudinal shining blue lines, expanded 

 posteriorly. The posterior margin of the dorsum is in the form of a 

 thin projection, running around from the root of one wing to that 

 of the other; above this the surface is considerably dusted. 

 Scutellum bare, coppery. Pleurae greenish, with white pollen. 



