188 DIPTERA OF NORTH AMERICA. [PART III. 



broad ; its first joint is about as long as the last three abdominal 

 segments taken together; from its basis to the middle it is 

 exactly as broad as the abdomen itself; beyond the middle it is 

 but little attenuate, so that the truncature at the end has a con- 

 siderable breadth ; the second and third joints of the ovipositor 

 are also rather broad ; the latter does not end in a sharp point, 

 but in a narrow truncature. Feet bare, their structure ordinary ; 

 femora unarmed; the tarsi blackish-brown from. about the tip of 

 the first joint. The yellowish-gray wings have two perpendicular 

 whitish crossbands; the first passes between the two ordinary 

 crossveins from the anterior to the posterior margin of the wing; 

 the second lies between the first and the apex of the wing, but 

 much nearer the latter, is obliterated in the marginal cell and does 

 not entirely reach the posterior margin; besides these two whitish 

 crossbands there is, at the end of the second basal cell and in the 

 adjoining region of the first basal cell a small, whitish spot ; the 

 coloring of the wing, on this side of the first crossband, towards 

 the root of the wing, changes gradually into clay-yellow, while 

 beyond the second crossband the color is almost blackish-gray ; 

 the posterior crossvein shows the trace of a delicate blackish-gray 

 lining, while there is no such trace on the small crossvein. 

 Hah. Texas (Belfrage). 



Gen. IX. C«ELOMETOPIA Macq. 

 Charact. — Front of moderate breadth, slightly narrowed anteriorly, some- 

 what excavated ; ocelli far removed from the edge of the vertex, 

 placed close to each other on a more or less projecting bump. 



Antenna! arista with a very short pubescence. 



No mesothoracic and one prothoracic bristle. 



Scutellum with four bristles ; metathorax somewhat sloping. 



Femora not incrassate, nevertheless strong, the four posterior ones 

 considerably longer than the front pair ; all are provided with 

 spines, the fore femora, however, with a few small ones towards the 

 tip only. 



Wings: posterior angle of the anal cell quite obtuse; the crossveins 

 not approximate to each other ; the last section of the fourth longi- 

 tudinal vein converges towards the third. 



With Ccelometopia a series of genera begins which have a 

 comparatively short, oval abdomen, not very attenuate at the 

 basis. The type of the genus is C. trimaculata Fab. = C. fer- 

 ruginea Macq. from South America, which Wiedemann placed in 

 the genus Trypeta. 



