J. R. MALLOCH 311 



This species is allied to Hyhmyia (Phorbia) fusciceps Zctter- 

 stedt, but differs in having more than one series of erect hairs on 

 the hind tibia. There is another western species which is very 

 closely related to neomexicana, the differentiating characters 

 being eniin erated below. 



Hylemyia cilifera sp. n. 



Male.- — Differs from the preceding species in color in having the head 

 black. 



The prealar bristle is nearly half as long as the one Ijehind it; the fifth 

 abdominal sternite is almost bare along the inner margins of the processes, 

 but the discs of these are furnished with much longer and stronger bristles 

 than in neomexicana; the armature of the legs is stronger than in that species 

 and very nearly the same, the noticeable difference being that in neomexicana 

 the antero-ventral series of erect hairs on hind tibia is nearly uniform in spacing 

 and strength from base to near apex, whereas in cilifera the hairs become more 

 wideh' spaced and distinctly stronger beyond middle, the last one being bristle- 

 like and rather widely removed from the one basad of it. Length, G.5 mm. 



Type. — cT ; Gallatin County, Montana, June 13, 1917, [Illi- 

 nois]. 



Hylemyia spiniventris Coquillett 



1900. Hylemyia spiniventris Coquillett, Pro. Wash. Ac. Sci., ii, 449. 



This species is represented by five males and nine females in 

 this collection, all of which were taken at Beulah, New Mexico, 

 June 28, 1902, on top of the range. 



This species and the four following agree very closely in color, 

 spiniventris differing noticeably in having the wings largely 

 fuscous. The mid and hind femora are armed on the antero- and 

 postero-ventral surfaces with strong bristles which are present 

 on at least the basal half, and the hind tibiae are armed with very 

 long bristles. 



Hylemyia marg^nella sp. n. 



Male. — Black, slightly shining. Frons, orbits, face, and cheeks with whitish 

 pruinescence. Thorax indistinctly trivittate, the spaces between vittae whit- 

 ish pruinescent. Abdomen with a broad l)lack dorso-cen^ral stripe, which is 

 dilated anteriorly on each segment. Wings almost hyaline, fuscous at base. 

 Legs black. Calyptra white. Halteres yellow. 



Eyes separated by at least the width across jjosterior ocelli; head in jn'ofile 

 the same as in marginala Stein; arista with the longest hairs not much more 

 than as long as basal diameter of arista; parafacials in profile distinctly wider 

 than third antenna! joint and slightly over half as wide as height of cheek. 



TRAXS. AM. ENT. SOC, XLIV. 



