DoUcJiopodidcV uf St. Vincent (^West Indies). 313 



apical half brown ; arista dorsal, black, short, curved, distinctly 

 feathered with sparse hairs. Cilia of inferior orbit white. Thorax 

 shining green, with a bronze median line extending to the scu- 

 tellum ; anteriorly this line is enclosed by the acrostichal bristles ; 

 the small humeral bristles occupy a large area. The usual black 

 colour accompanies the transverse suture on its upper side. In the 

 proper light there is a silvery pollinose spot behind the humerus, 

 another above the root of the wing, and a third behind it. Pleurse 

 blackish-green, white-dusted. Cilia of tegulaj black. Abdomen 

 shining green, the sides of each segment silvery pollinose ; each 

 incisure is covered with a broad black band. Hypopygium black, 

 exserted, the peduncle nearly as long as a segment of the abdomen ; 

 lamellae small, dark-brown, with slender cilia, and on the upper side 

 a row of equal short spines. Front coxfe yellow ; middle ones 

 brown, except the tips ; hind ones yellow, with browu base. The 

 front and middle ones have numerous black hairs ; the former have 

 several bristles, the latter only one of any size ; hind coxae with a 

 single lateral bristle. Femora and tibiae yellow ; the middle 

 femora with a row of delicate, short, light-colouied cilia below. 

 Middle and hind femora with preapical bristle. Tarsi yellow, the 

 middle and hind ones infuscated toward the tip. Fore pulvilli 

 enlarged ; hind metatarsi shortened. Wings slightly infuscated ; 

 the last section of the fourth vein bends gently forward, runs 

 nearly straight for a distance, then is gradually recurved, ending 

 near the third, which bends back at tip. 



^ . Face wider and more yellowish ; palpi and proboscis larger, 

 yellow ; third joint of antennae smaller, scarcely infuscated ; dorsal 

 stripe wider ; pulvilli normal ; middle femora without cilia. 



Length 4 mm. ; of wing, 3'8. 



Twelve males, five females. Sea level to 1500 feet. May. 



2. Pelastnneurus argentiferus, n. sp. 



(^. Face wide, concave to the suture, convex below, the con- 

 cave portion shining green, except that the sides and lower part 

 are somewhat silvery pollinose ; this pollen covers the convex part. 

 Palpi a little more yellowish. Front violet-green, scarcely shining. 

 Antenna3 blackish, the lower side reddish to a variable degree. 

 Third joint short when fully developed, in some specimens shrivelled. 

 Arista plumose, short, thick at base, rapidly tapering. Cilia of 

 inferior orbit whitish. Thorax dark green, but little shining, 

 acrostichal bristles in two rows, enclosing an area which is opaque 

 as far as the middle. On each side of this, reaching to the inner 



