Di/ptera of SL Vincent {West Indies), 355 



yellowish in ground colour. Mesonotum thickly grey pollinose, 

 with five black stripes, the lateral ones interrupted. Abdomen 

 flattened ovate ; shining black, with the anterior part of the 

 second and third segments opaque grey; first segment without 

 median bristles ; second segment with a pair of marginal ones ; 

 third segment with a posterior row ; fourth segment bristly on the 

 posterior half. Legs black ; claws elongate. Calyptrse white. 

 Wings cinereous hyaline. Length 4^ mm. 



One specimen. Prospherysa seems to differ from 

 Phorocera only in the bare eyes, and tlie eyes of this 

 specimen are, practically bare, so that it is a question 

 whether or not this species should not be located in 

 that genus. The cross-veins on the outer side of the 

 wing are more than usually oblique, still hardly as much 

 so as in Flagia. The genus Plagioprospherysa, Towns., 

 which is synonymous with Prosopodes, B. and B., was 

 based upon this character alone, and is to me hardly 

 entitled to acceptance. 



EXORISTA. 



Meigen, lUiger's Mag., iii., 1803. 

 1. PJxorista nohilis, n. sp. (PI. XI., fig. 92, head of $ .) 



cJ . Front somewhat prominent, only a little narrowed behind ; 

 above, equal to about one-fourth of the width of the head ; light 

 golden-yellow in colour, with an opaque black stripe, which is 

 narrowed above ; vertical bristles strong ; ocellar bristles small, 

 proclinate ; the single row of frontal bristles descends nearly to the 

 base of the third antennal joint ; the sides have only a few short 

 weak hairs. Sides of the face yellow above, silvery below ; in 

 width not equal to one-third of that of the median depression ; 

 four or five bristles on the vibrissal ridges, extending, in some cases, 

 nearly to the middle of the face ; median depression silvery-white. 

 Cheeks narrow, bare, silvery. Proboscis black ; palpi and labella 

 yellow. Antennas nearly black, the first two joints and the base 

 of the third rufous ; third joint five or six times as long as the 

 second. Thorax densely grey pollinose ; mesonotum with two 

 slender median stripes, reaching from the pronotum to beyond 

 the suture ; and a broad shining stripe on each side, interrupted 

 by the suture, and abbreviated in front and behind. Scutellum 

 grey, with six bristles. Abdomen elongate and narrow, black 

 throughout ; the second, third, and fourth segments broadly and 



