126 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



1 female, Nigger Hill, Montana, from Professor Melander, col- 

 lected by W. M. Mann. 



1 female, Collins, Idaho (Melander). 



1 female, Big Horn, Wyoming, lent by United States National 

 Museum. 



2 females, Banff, Alberta (J. Fletcher), lent by Dr. C. Gordon 

 Hewitt. 



1 female, "Walrand Ranche, north of Pincher, " lent by Dr. 

 Hewitt. 



2 females, ''Colorado," lent by United States National Museum 

 from a series of 8 in one lot, which are standing under the name 

 fulvipes Bigot, determined by Coquillett. The femora are brown 

 except apically. 



1 female, Logan, Utah (Agr. Coll.). 



1 female. Brightens, Utah; 1 female, Beulah, New Mexico (United 

 States National Museum). 



1 female, Longs Peak Trail, Colorado (CockereU). 



Under the names (chronologically arranged) of fulvijJes, Mrta, 

 dnerea, &nd Jiavipal pis, we have to do with a series of female speci- 

 mens from the east and all over the west, agreeing in having black, 

 cinereous color, tliird antennal joint convex, face bare, and tibiae 

 yellow or at least not black. No males have ever been assigned to 

 fulvipes Midi jiavipalpis ; in dnerea only the type male has been found, 

 which lacks the halteres; in liirta I have seen half a dozen eastern 

 males. Not a single western male assignable to one of these species 

 has come to light. 



These females vary (in lots taken at the same time) in the colora- 

 tion of the antennae, palpi, and legs, as well as in minor characters, 

 to such a degree that it seems at present impossible to decide as to 

 the number of species. I have examined type material in all four 

 of the nominal species, and in both sexes where both where described, 

 and have redescribed the same with care, except in the latest one, 

 which I feel sure will fall under one of the others. I am inclined to 

 lump all four under the oldest name, but can not see my way to do 

 so in the absence of western males. Then again, there is a slight 

 probability that the male of dnerea has infuscated halteres, which 

 would give that species one definite character. 



To sum up the principal slight differences which appear to justify 

 the recognition of three specific names for the present: 



Fulvipes. — The single female type has wholly yellow femora like 

 female dnerea, but has longer black pile on front and thorax than I 

 find in any other females in the whole mass of material I have ex- 

 amined. 



Cinerea. — Femora wholly yellow, pile of thorax short and largely 

 pale, that of front very short though black. 



