DolicJiupuilidse of St. Vincent {West Indies). 339 



x\CHALCUS. 



Loew, Neue Beitr., v., 1857. 



1. Achalcus sordidus, n. sp. (PI. XI., figs. 107, wing of ^^ ; 

 107a, wing of 9.) 



Minute, blackish, non-metallic, the male with an opaque brown 

 or yellow spot in the first posterior cell. 



^. Face narrow, more so in the middle, where the eyes are 

 almost contiguous. Antennte short, third joint a little pointed, 

 with an apical, or perhaps subapical, arista. Front wide. Thorax 

 and abdomen blackish, non-metallic. Hypopygium concealed, but 

 rather large, hence the abdomen scarcely tapering. Legs dull 

 brown or yellowish, variable according to the age of specimen 

 when captured. Wings slightly brownish, slender; sixth vein 

 wanting, first very short, ending but little beyond the fork of the 

 second and third ; third ending a little before the apex ; fourth 

 sinuous, as figured, along its front side, near the end, a large 

 yellow or brown opaque spot. The hind margin sinuous, and 

 fringed with delicate hair. Acrostichal bristles in two rows. 



5 . Face wider, not naiTowed ; antennae a little shorter, vena- 

 tion simple. 



Length 07 mm. 



Two males and four females. Altitude 500-1000 feet. 

 The specimens are so badly shrivelled that a complete 

 description is impossible. The size, colour, and especi- 

 ally the venation^ are sufficient to distinguish the species. 



Xanthotricha, n. g.* 



Small species, with yellow or brownish bristles and hair ; legs 

 yellow ; face in male rather narrow ; antenna} small, the first and 

 second joints united to form a sort of cup, in which the third is 

 inserted, like an acorn ; first antennal joint bare above ; arista 

 apical or subapical ; hypopygium exserted, small or large ; dorsum 

 of thorax convex behind ; hind metatarsus short ; acrostichal 

 bristles two-rowed. First longitudinal vein very short, sixth 

 wanting ; fourth vein straight beyond cross-vein. 



1. Xanthotricha ciipuUfera, n. sp. (PI. XI., figs. 106, 

 wing ; 106a, hypopygium.) 

 Metallic-green, legs and all the bristles yellow. 

 (J . Face narrow, wider above, in a certain reflection violet, 

 without dust ; front wide, rather short, violet, proboscis and palpi 



•■■ Eavd6sj yellow ; twxos, hair. 



