Dll'TKUA ASLLll^E. 5G3 



Family CYRTID>E Loew. 

 ACROCERA Meigen. 



ACROCERA HIRSUTA. 

 s PL 5, Fig. 5. 



Acrocera hirsuta Scudd., Bull. U. S. Geol. Googr. Surv. Terr., Ill, 755 (1877). 



A single very fragmentary specimen appears to belong in the neigh- 

 borhood of Acrocera, but is too imperfect to mention with any ccrtaintv. 

 Tin- size of the insect, the small head, robust and coarsely haired thorax, 

 stout and abbreviated abdomen, indicate a form resembling that of Acro- 

 cera, ami the tibiae appear to be destitute of spurs; but the legs are not 

 very slender and the neuration of the fragment of the wing does not agree 

 well with Westwood's figure of A. globulus Panz. in Walker's Diptera Bri- 

 tannica. There are, however, only a few longitudinal veins next the 1> 

 disconnected and faint, so that they afford very slight indication of the real 

 character of the wings, and the transverse veins being obliterated nothing 

 can be said of the basal cells. Thorax and abdomen of about equal size. 

 Length of body, 4.5"""; head, 0.6"""; height of same, 1.3 

 Fossil Caiion, White River, Utah. One specimen (W. Denton). 



Family ASILID^E Leach. 

 STENOCINCLIS Scudder (arevte, i;/A/?)- 



Slenocindii Scudd., Bull. U. S. Gcol. Geogr. Snrv. Terr., IV, 751 (1378). 



This genus of Asilida- is founded wholly upon characters drawn from 

 the ueuiation of the wing, the only portion of the insect preserved. It falls 

 into the group of Dasypogonina, in which the second longitudinal vein t< i 

 inmates on the margin apart from the first longitudinal vein, instead of 

 uniting with it just In-fore the margin. It is not very far removed from 

 hioctria, but differs from it and from all Asilida 1 I have examined in that 

 the third longitudinal vein arises from the first before the middl. 

 wing, instead of from the >ecoiid longitudinal vein alter its emission from 

 the first : the first longitudinal vein has therefore two inferior shoots, Diving 

 the wing a \er\ peculiar aspect, and causing it to dilVer radical! v from all 

 other Asilida 1 ; indeed, it would be hard to know win-re to look fora simi- 

 lar feature among allied hiptera, unless it be in the anomalous group of 



