Diptera of St. Vincent (West Indies). 401 



2. Hydrina nitifrons, n. sp. 

 i . Front broad and short, wholly shining black. Antennae 

 yellow ; all the joints blackish on the upper margin ; third joint 

 more than twice as long as broad, hairy on the upper border ; 

 arista pubescent. Face black, lightly silvery dusted ; convex from 

 side to side and gently receding below ; bristles of the sides small 

 and short. Cheeks very narrow. Ej-es very sparsely pubescent. 

 Thorax deep black ; mesonotum and scutellum shining, the pleurae 

 whitish dusted ; the mesonotum has two strong bristles near the 

 middle, and the scutellum two equally strong ones on its margin. 

 Abdomen shining black. Legs light yellow, the last two joints of 

 the tarsi black ; coxse black. Wings nearly hyaline ; third section 

 of the costa two-thirds the length of the second section ; pen- 

 ultimate section of the fourth vein short. Length 1 mm. 



One specimen, St. Vincent. In the structure and 

 markings of the head, except the arista, this species 

 agrees closely with ff. nitida ; the face is somewhat 

 broader. The second section of the costal vein and the 

 penultimate section of the fourth vein are longer. 



OCHTHEKOIDEA, B. g. 



Small, black species. Eyes bare. Front broad, slightly narrower 

 in front. Face narrowest a little distance below the antenna, 

 lightly concave above, and with a shallow depression under each 

 antenna. Face on each side below slightly wrinkled. Cheeks 

 broad, the oral cavity rather small. Clypeus projecting. Face and 

 cheeks wholly without bristles save two or three small ones on the 

 sides of the former. Second joint of the antennte with a small, 

 short bristle at its tip ; third joint oval, with a pectinate arista. 

 Bristles of the vertex and the thorax very short and thin. Abdomen 

 much flattened, elongate oval ; first and fifth segments short, the 

 others successively increasing in length. Front femora incrassate, 

 and with a row of short spines on the under distal third ; claws 

 and pulvilli normal ; all the tarsi slender. The costa reaches to the 

 fourth vein ; third and fourth veins parallel. Middle tibiis without 

 bristles on the outer side. 



1. Ochthewidea atra, n. sp. (PI. XIII., figs. 146, wing ; 

 146a, front leg of $ .) 



$ . Front and face shining, submetallic black. Antennge black, 

 the third joint whitish pubescent, the arista with five or six rays. 

 Thorax and abdomen deep opaque, the pleurae moderately shining. 



