190 DIPTERA OF NORTH AMERICA. [PART III. 



that the latter is much narrower before the small crossvein than 

 beyond it; posterior crossvein straight, somewhat oblique; the 

 last section of the fourth longitudinal vein strikingly long, 

 distinctly converging towards the third longitudinal vein ; poste- 

 rior angle of the anal cell very obtuse. 

 Hab. Cuba (Gundlach). 



Gen. X. HEM1XAIVTHA nov. gen. 



Charact. — Front of medium breadth, somewhat narrower anteriorly, not 

 excavated ; the posterior ocelli not very far from the edge of the 

 vertex ; the anterior one removed to about the middle of the front. 



Antennal arista with a distinct pubescence. 



A small prothoracic, and, as it seems, no mesothoracic bristle. 



Scutellum with four bristles ; metathorax perpendicular. 



Femora not incrassate, but rather strong; the posterior ones longer 

 than the foremost ones ; all are beset with spines ; the spines of 

 the foremost ones are but very few. 



Wings : posterior angle of the anal cell obtuse ; crossveins conspicu- 

 ously approximate ; the last section of the fourth longitudinal vein 

 is parallel to the third. 



The difference from Ccelometopia consists principally in the 

 peculiar position of the ocelli, the remarkably approximate cross- 

 veins and the parallelism of the third and fourth longitudinal 

 veins. 



I do not know of any described species of this genus and for 

 this reason give the following : — 



1. H. spinipes n. sp. 9.— (Tab. IX, f. 28.) Lutea, metanoto 

 epimerisque metatboracis nigris, abdomine chalybeo, violaceo-splen- 

 dente ; alse subhyalinae, apice fasciisque tribus fusco-nigris ; harum 

 secunda postice, tertia antice, abbreviate. 



Clay-yellow, metanotum and epimera of the metathorax black, abdomen 

 steel-blue, with a violet reflection ; wings rather hyaline, the apex and 

 three crossbands brownish-black; the second of th^se abbreviated 

 posteriorly, the third anteriorly. Long. corp. 0.24; long. al. 0.23. 



Clay-yellow, thoracic dorsum more yellowish-red. Front of 

 medium breadth, but little narrower anteriorly, not excavated, 

 with but a small depression on the vertex; the two posterior 

 ocelli are placed upon a very small black spot, at a moderate 

 distance from the vertex and close to each other ; the anterior 

 ocellus is quite unusually distant from them, and placed about 



