THE CANADIAN ENTOMOLOGIST. 313 



GiCitiopsis Brauer and von Bergenstamm. 



I have been unable to determine certainly whether any of the speci- 

 mens in the U. S. N. M. colleclion are referable to mexiama B. and B. I 

 find that ihe specimen originally determined as mexicana by Mr. 

 Coquillett (in "Revision of Tachinidte," p. 136), is identical with specimens 

 described by him later under the name ocellaris (in Proc. U. S. N. M., 

 XXV, 118). The specimens which he subsequently determined as 

 mexicana have been separated by Mr. Townsend into two species, 

 sierricola Towns, and organensis Towns., which he described as new in 

 the ''Taxonomy of the Muscoidean Flies," p. 93. It is very difficult to say 

 which of these forms is the true mexicana, and pending comparison of 

 specimens with the type the names may as well be left as they are. Mr. 

 Townsend's two species are, at all events, exceedingly closely allied, but 

 a larger series is necessary in order to determine the limits of variability 

 of the species. 



The genus PoUophrys, proposed by Mr. Townsend {loc. cit., p. 90), 

 for these species, certainly cannot be maintained in view of their undoubted 

 close relationship to mexicana, which is the type of Gcediopsis. Mr. 

 Townsend gives no characters for the separation of his genus from 

 Gcediopsis, and I have been unab'e to discover any. 



Tl',e following key to the North American species, based upon ihe 

 specimens in the U. S, N. M. collection, may be of service. The type- 

 specimen of Gcediopsis 7nonticoIa, described by Mr.. Townsend from one-- 

 male specimen collected in the Organ Mts., New Mexico, has been ex- 

 amided by Mr. Coquillett, who informs me that it is the same as setosa Coq. 



1. Legs black or tinged with rufous, at most with the tibiae reddish .... 2. 

 Legs, except the tarsi, yellow ; tarsi dark brown ; first abdominal 



segment without marginal macrochsetce ; no ocellar bristles ; ihird 

 aribtal segment from about one and one-half (males) to about three 



times (females) the length of the second segment ; several ma- 

 crochaetas and a number of strong biistly hairs on the parafacials. 

 Length, 7.5 mm G. flavipes Ccq. 



2. Third aristal segment not over one and one-half times the length of the 



second segment ; parafacials without macrocha?t8e or strong bristly 

 hairs, near the lowner corner of the eye on the outer part of the 

 parafacials with only a cluster of fine hairs, which extend along the 

 parafacials for less than one-half of the distance from the level of the 

 vibrissae to the lowest frontals ; with one or two similar fine hairs 

 below the lowest frontals ; parafacials otherwise bare ; ocellar bristles 

 strong ; fourth segment of the abdomen, except the base, red, 



