Dolichopodidse of 8f. Vincent {West Indies). 345 



its length from the margin. The anterior branch of fourth vein 

 makes an acute angle at its origin. Third vein not recurved 

 forward at its tip. 



$ Colour less inclined to blue and violet ; third joint of 

 antennae short : bristles shorter ; black bands of abdomen nar- 

 rower, comprising about one-third the segment. Middle meta- 

 tarsi not ciliated ; hind tibiae and tarsi only a little hairy. 



Length 4*5 mm.; of wing, the same. 



Sea-level to 1000 feet. Nine males and numerous 

 females. 



Leptorhethum. 



Aldrich, Kans. Univ. Quart., July, 1893. 



1. Leptorhethum angustatum. (PI. XII., fig. 108, wing 



of 6.) 



Aldricli, I. c. 



^ . Small, green, legs yellow, abdomen yellow with green spots 

 above, wings narrowed at base, cilia of tegulse yellow. Face narrow, 

 wider above and below (the eyes almost contiguous in the middle), 

 white pollinose, showing a little of the green ground colour below 

 the antennae. Antennae small, yellow, arista dorsal. Front bright- 

 green, not excavated (this may be owing to a little extent to the 

 shrivelled condition of the eyes in my only specimen), the lateral 

 bristles small. Proboscis and palpi yellow. Thorax bright-green, 

 the bristles mostly small. Pleurae green, white pollinose, the hind 

 margin yellow, halteres, tegul^ and their cilia yellow. Abdomen 

 yellow ; dorsum of first segment green except a line in front ; 

 second segment green on the last two-thirds above ; third segment 

 scarcely half green above, the colour not reaching the sides; fourth 

 segment with only a small spot of green ; fifth and sixth except 

 the base and venter of the former, wholly green ; hypopygium 

 small, blackish, embedded, the small whitish lamella protruding. 

 Legs, including coxae, yellow ; tarsi but little infuscated ; front 

 coxae long, almost entirely bare ; front metatarsi longer than the 

 tibia. Middle tibi^ rather stout, above the middle on the fore 

 side with a rather prominent bristle. Metatarsi longer, on the 

 hind side with a very sparse row of small bristles, more dense near 

 the end, where they are quite brush-hke. The following joints 

 simple, but oddly drawn up in my specimen. No noticeable 

 bristles on fore or hind legs. Wings hyaline, third vein recurved, 

 as figured. Length 2 mm. ; of wing, 2-2 mm. 



May. A single male. 



