186 DIPTERA OF NORTH AMERICA. [PART III. 



of the diseal cell ; the last section of the fourth longitudinal vein 

 is almost parallel to the third vein; the posterior angle of the 

 anal cell is quite obtuse. 



Male*. — The two specimens which I have before me differ from 

 the females by the absence of the upper black crossband on the 

 front, of the black crossband of the occiput and of the spots on 

 the face which have a black coloring ; all which in the female is 

 described as black or blackish-brown, is of a dingy rusty-brown 

 in the male. As, at the same time, the contrast between the 

 yellow and the ferruginous regions is less striking, this gives 

 these specimens a less variegated appearance than that of the 

 above-described female. The first abdominal segment is just as 

 narrow as in the female ; but. this is less apparent here, as the 

 posterior part of the abdomen is less broad. 



Hab. Cuba (Gundlach). 



Gen. VIII. STENERETMA nov. gen. 



Churact. — Front very broad, not attenuated anteriorly; occiput very con- 

 vex; cheeks broad; ocelli small and rather approximate to each 

 other. 



A/ista thin and bare. 



A strong mesothoracic bristle ; no prothoracic one. 



Scutellum with two bristles ; metathorax sloping. 



Abdomen slender and elongate, attenuate towards the basis. 



Femora of medium strength, all unarmed. 



Wings but little developed, short and exceedingly narrow, attenuate 

 in the shape of a wedge towards the basis, so that their surface 

 beyond the fifth longitudinal vein is nothing but a narrow, veinless 

 strip ; the auxiliary vein so closely approximated to the first longitu- 

 dinal vein, that they can be distinctly told apart at their end only ; 

 the two ordinary orossveins approximate to each other; the small 

 one lies but little beyond the middle of the wing ; second basal cell 

 very small and narrow; the anal cell and the sixth longitudiual 

 vein are wanting, with the exception of a rudiment of the latter, 

 which does not reach beyond the axillary incision. 



As the group of the Ulidina contains the genera with a more 

 developed anal cell, the group of the Richardina on the contrary 

 those with a less developed one, there can be no doubt that the 

 present genus, in the incompletely developed wings of which the 

 anal cell is altogether wanting, belongs to the Richardina; and 

 that this is its true location is proved by its relationship to 



