Diptera of St. Vincent {Wed Indies), 261 



small, oval, black spot ; tibiae yellow, the tarsi more brownish. 

 Abdomen brown or blackish above. Wings tinged with brownish' 

 Leugth 2-2^ mm. 



Six specimens. 



PEOBOLiEaS, n. g. 



Proboscis more than half of the length of the body, slender, 

 directed downwards and forwards, composed of five slender 

 bristles ; palpi wanting. Antennae sixteen-jointed, compressed, 

 the joints closely set together ; first two joints only a little 

 differentiated from the others. Head composed almost wholly of 

 the eyes ; face very narrow ; front narrow below ; eyes pubescent. 

 Thorax strongly convex, nearly bare, a few short bristles on the 

 sides. Scutellum small, with about six small bristles. Abdomen 

 slender, elongate, longer than the wings ; male organs composed of 

 a pair of simple, fleshy forceps. Four anterior legs very slender ; 

 hind legs stouter and much elongate, the femora thickened, and 

 .the tibiae clubbed. Neuration defective ; third vein entirely 

 separated from the first, and without anterior branch ; proximal 

 portion of the fourth and fifth veins wholly invisible ; sixth vein 

 complete. The costa reaches a considerable distance beyond the 

 tip of the third vein. 



This genus is remarkable in the apparently entire 

 absence of the palpi. The closest examination of our 

 three specimens has failed to reveal any trace of them. 

 The labium, or sheath for the other mouth-parts, is 

 quite rudimentary. In the wings there is not the 

 faintest trace of the proximal portions of the fourth and 

 fifth veins ; those portions that are present are by no 

 means weak. An equally minute examination fails to 

 show the ocelli, though I will not be positive that they 

 are not present. The presence of tibial spurs, the 

 moderately elongate coxae, and the general relationship 

 to other species of the family, especially Gnoriste^ seem 

 to prove the correct location of the genus here. 



1. Proholxus slngiilariS) n. sp. (PI. VIII., figs. 15, wing ; 

 1 56t, head ; 15/;, mouth-parts ; 15c, hypopygium.) 



$. Front, face and occiput black. Antennae brown, the basal 

 joints somewhat yellowish. Mesonotum opaque deep reddish- 

 brown, the humeri and postalar callosities yellowish. Pleurae 

 brown or yellowish-brown, shining. Abdomen black, the first 



