NORTH AMERICAN DIPTERA. 53 



On the North American ASIL,ID.E (Part II). 



BY S. W. WILLISTON, M. D. 



The present article is a continuation of the one in volume xi, pp. 1-35 

 of these Transactions, and includes the remainder of the Asilid^e, with 

 the exception of the genus Asilus (sensu lat.). A considerable amount of 

 material I have accumulated in this latter group, and descriptions are in 

 manuscript, but the many problems they offer, yet unsolved, render their 

 present publication inexpedient. 



DASYPOGOMIRi^. 



Stichopugon trifasciatus Say. 



Specimens from Kansas show no differences from New England ones. 



Ablantatns niimus 0. S. 



This species also occurs in Arizona. 



Ijaphystia sexfasciata Say. 



Specimens of this species from Montana differ appreciably from those 

 from the Southern States that I have seen. In all the Northern speci- 

 mens the pollinose bands of the abdomen are all entire, while in the 

 Southern ones they are mostly interrupted ; the femora, moreover, in the 

 former are mostly yellow, while in the others they are chiefly black. 

 These differences, if not sufficient to warrant specific separation, may be 

 varietally indicated by the name notata Bigot, for the Southern form. 



IVIyelaphus lobicornis 0. S. 



I have seen a specimen of this species in which the fourth posterior 

 cell is wide open. It is doubtful whether the species which I described 

 in the first part of this is the same. Ceraturgus dispar Loew (Syst. 

 Beschr. Bd Suppl. Band. p. 122} from Europe is apparently a Myelaphus 



Aphaniartania fur n. sp. 



% .—Length fij mm. Small, black, thickly white pollinose. Head and an- 

 tennae in structure like those of sijecies of Nicocles, except that the vertex is not 

 so deeply excavated on the sides of the ocelli. Face and front with a silvery- 

 white pubescence, the former otherwise bare, except a thin row of white hair on 

 the oral margin, and the latter with a few white hairs. Antennae black, slender. 

 Thorax thickly white pollinose, bare, except the weak white bristles,- dorsum with 

 two slender, brown, median stripes, and two small, less definite brown spots on 

 each side, the one before, the other behind the suture. Abdomen rather short and 



