new Diptera from Trinidad. 



425 



Well, Dominica (host, Vespertilio nigricans) , Trichobius para- 

 siticus, Gerv., differs as follows from the new species : — 

 Eye-spot with about eight distinct facets. Mesonotum with 

 two rows of long bristles in front, remainder with minute 

 bristles which are less numerous and smaller than those of 

 T. ccecus ; several moderately long ones just before the 

 scutellum. Longitudinal suture not bifurcate!, extending 

 nearly two-thirds of the distance from the front margin to the 

 transverse suture. Anterior angle of metasternum more 

 obtuse. Length 2" 2 mm. 



I consider it doubtful, however, whether the Dominican 

 specimens are correctly identified, since both they and the 

 Trinidad species have the front femora much less swollen 

 than is indicated by Grervais for T. parasiticus and Kolenati 

 for Strebla wiedemanni. Neither of these forms shows the 

 emargination of the wing-tip, given by Speiser as a character 

 of T. parasiticus. 



Erioptera troglodyta, sp. n. 



Head dark brown; antennae and palpi blackish ; a white 

 spot on the front just above the base of the antennae. Thorax : 

 mesonotum rather light brownish, somewhat darker towards 

 the margins, but without distinct stripes. Pleurae light 



Erioptera troghdyta, <$ genitalia. 



yellowish ; one broad dark brown stripe across the middle ; 

 sternopleura also dark brown. Abdomen blackish. Male 

 genitalia as figured. Legs ochreous brown ; femora with the 

 tips almost white and with a dark brown subapical ring. 

 Wings entirely unmarked ; venation as in E. immaculata, 

 Alex. ; wing-length 3 mm. 



Allied to E. immaculata, Alex., but the coloration of the 

 thorax is quite different. Alexander placed E. immaculata 

 in the subgenus Mesocyphona, but according to Osten-Sacken's 

 definition both it and the new species are typical Erioptera. 



