NORTH AMERICAN DIPTERA. 93 



frontal vitta dark l)ro\vii or hiackisli, more than one-tliird tlie width of front 

 before, widened posteriorly and split, en<!losing the ocelli ; face blackish, sides of 

 face below and cheeks blackish or dark brown ; antennae dark brown or blackish, 

 second joint with a few short bristles, arista yellowish brown ; probascis black, 

 except base and tip, which are light brown; palpi dark brown, nearly black, 

 with black bristles, which are long on the under surface; occiput shining black, 

 clothed with black hairs. Thorax and scutellum shining black, with black hairs 

 and bristles; humeri and plenr«> also shining black. Abdomen shining black, 

 clothed with short bristly hairs; first two segments witli a lateral macrochreta, 

 but without median ones; third segment with a median marginal pair and a 

 single lateral one; fourth segment fringed with marginal macrochsetse; venter 

 black shining. Legs black, moderately bristlj' ; pulvilli yellowish white. Wings 

 grayish hyaline towards tip and on hind border, but broadly orange yellow at 

 base and on front border; tegulai orange-yellow, sometimes whitish, except on 

 the border ; halteres fuscous. 



9 • — Differs as follows: Front and sides of face entirely black, shining, except 

 a narrow silvery streak running from base of antennae to anterior margin of the 

 eye; front considerably wider, about half as wide again at vertex; claws and 

 pulvilli somewhat elongate, but much shorter than those of the male; apex of 

 abdomen without genital appendages. 



Length of body 9 — 10 mm. ; of wing 7 — 8 mm. 



Described from three specimen.s, two males and one female ; Brook- 

 ings, S. Dakota (J. M. Aid rich). 



Echiiioiiiyia tlionisoiii Willist., Trans. Am. Ent, Soc. xiii, 301. 

 Dr. Williston has suggested this name for E. fiUpalpis Thomson, 

 as the latter name had been used })revi()usly by Kondani for a South 

 American species. In the light of recently discovered synonymy, 

 this change is unnecessary, as E. fiUpalpis Rdi. is a synonym of E. 

 7'obusta Wd. (see v. d. Wulp, Biol. C.-A.) I have nineteen speci- 

 mens from Las Graces, N. Mex., April 8th — August 31st, and one 

 from Guanajuato, Mex. (A. Duges). Two of the New Mexico speci- 

 mens are much smaller than the others, but are evidently the same 

 species. They are 8.5 and 9 mm., both males taken August 31st. 

 My largest specimen is a female, 12.5 mm., taken June 10th. A 

 Californian specimen, July 12th (Harrington), seems to be the same, 

 but the sides of face are nuich wider. 



Keliiiioniyia robusta Wd. 



Two from Constantine, Mich., August 23d ; one Nebraska, October 

 20th (Bruner) ; one Iowa (Osborn) ; one Carlinville, 111. (Robert- 

 son) ; one from New Hampshire (Johnson) ; eleven from New York. 

 May 31st, only one specimen dated (Comstock) ; and one from Ot- 

 tawa, Canada (W. H. Harrington). 



TRANS. AM. ENT. SOC. XIX. APRIL, 1892. 



