Dipt era of St. Vincent {West Indies). 395 60^ 



5. Psilopa desmata, n. sp. • ,^ , '^^X? ^ ' 



(^ . Face not broad, a little wider below ; gently convex in the 

 middle above, with a depression below each antennae ; opaque 

 yellowish-grey ; on either side below with four or five strong 

 bristles, convergent above. Front broader than the face, opaque 

 black, thinly brownish-dusted below. Antennae yellowish-red, the 

 second joint somewhat blackish in front, and with a moderately 

 strong bristle at its tip ; arista with five rays. Cheeks narrow, 

 with a row of strong bristles continuous with those of the sides of 

 the face. Proboscis yellow. Mesonotum deep brown, moderately 

 shining. Pleurae whitish-poUinose. Abdomen black, moderately 

 shining ; first segment short, the others successively increasing in 

 length. Femora black, the immediate tip yellow ; tibiae and tarsi 

 light yellow, the hind tibiae with a blackish ring in the middle. 

 Halteres yellow. Wings nearly hyaline ; second section of the 

 costal vein of nearly the same length as the third, or slightly 

 longer. Length 2 mm. 



One specimen. St. Yincent. '^ Near the sea by open 

 stream.^' It is possible that this species were better 

 located under Discocerina. The third joint of the 

 antennae is rounded, but the face can not be said to be 

 carinate, though the convexity of the upper part is con- 

 fined to the middle part. 



DiSCOCEKINA. 



Macquart, Hist. Nat. Dipt., Suites a Buffon, ii., 527, 

 1835 ; Clasiopa, Stenhammer, Monogr. der 

 Ephydr., 251, 1844. 



1. Face silvery-grey with a median black stripe . . nana, n. sp. 

 Face uniform in colour . 2 



2. Face vaulted, oral opening very large .... facialis^ n. sp. 

 Oral opening of moderate size 3 



3. Last abdominal segment largely or wholly silvery-grey 



leucoprocta, Loew. 

 Last abdominal segment not unlike the preceding ohscura, n. sp. 



1. Discocerina leucoprocta. 



? Discocerina leucoprocta, Loew, Berl. Ent. Zeit., 1861, 



255; Monogr., North Amer. Dipt., i., 148. — 



Maryland. 



$ , ^ . Front opaque yellowish-brown, narrowly whitish on 



the lower orbital margins. Antennae reddish-yellow, the third 



joint orbicular, and blackish on the upper distal part. Face 



