DoUchopodidx of St. Vincent {West Indies). 311 



Cilia of tegula black. Tegulse and halteres deep yellow. Abdomen 

 olivaceous, slightly shining, on the sides shining green, and vent- 

 rally white pollinose. Hypopygium free and rather large, but 

 sessile ; colour black, a little dusted on the sides, the lamella are 

 brown, yellowish at base, rather long and narrow, with rounded 

 corners and a fringe of long black bristles all the way around 

 except basally. All the coxae brown, their tips yellow ; femora 

 yellow, tibise brownish-yellow, the hind knees brown. Tips of 

 front tibiae light yellow ; first joint of fore tarsus of the same 

 colour for two-thirds of its length, the remainder of the tarsus 

 brownish-black. The joints beyond the first are short, and all are 

 somewhat thickened ; the last is rather long, and bears a little 

 prominence on the underside near the base ; the claw on the inner 

 side is greatly enlarged, and bends back across this prominence as 

 a straight spine, forming a grasping organ ; beyond this its point 

 curves laterally, the other claw and the pulvilli are nearly normal, 

 but the latter are inserted a little toward the side instead of 

 exactly at the end ; the other tarsi normal, brownish-black beyond 

 the first joint, which is short in the hind foot. Middle and hind 

 tibiae a little infuscated at the tip. Wings a little brownish, more 

 so along the veins, costa a little thickened in its first part ; the 

 fourth vein makes a gradual curve forward throughout its last 

 section, the convexity behind (see figure). 



5 . Face wider and more prominent, the two convexities uniting 

 below. Pollen more greyish. Palpi larger. Antennae more 

 yellowish below. Front tibiae yellow with brownish tip, their tarsi 

 simple, coloured like the others. Costa very much thickened before 

 the end of the first vein. In one of my females each posterior 

 cross-vein has a short stump on the exterior side near the middle. 



Length 4-4*5 mm. ; of wing, 4 mm. 



Four males and four females. May. 



Hercostomus. 

 Loew, Neue Beitr., v., 1857. 



1. Hercostonms latipes, n. sp. (PI. XII., fig. Ill, tip of 



wing.) 



.^ . Face very narrow in the middle, above and below a little 

 wider, with a median groove almost the whole length ; in colour 

 yellowish-brown, with thick silvery pollen. Palpi and proboscis 

 yellow or a little brownish. Front shining green. Antennae red ; 

 third joint brown, oval, slightly pointed, with a dorsal, moderately 

 pubescent arista. Cilia of inferior orbit white. Thorax shining 



