38 PROCEEDINGS OF THE NATIONAL MUSEUM vol.69 



cell beyond middle; metathoracic spiracle about size of third anten- 

 nal joint. 



Because of coloration and distribution this species can only be 

 confused with notJia. Its broader head, with corresponding broad- 

 ening of front and face, and its comparatively short antenna and 

 arista serve to distinguish it from notlia. 



Distribution. — A fairly common species in the West: Nebraska, 

 Colorado, New Mexico, Idaho, and Washington. Townsend recorded 

 it from the District of Columbia — probably a specimen of Mcolor 

 with dark apical markings. 



Type. — In British Museum. 



XYLOTA ARGOI, new species 



Female. — ^Medium sized, blackish species with the abdomen largely 

 yellowish brown. Head broadly elliptical, tending to be flattened 

 on outer sides; front rather narrow, shining black with pollinose 

 band just below middle; ocelli a little advanced before hind margins 

 of eyes; antennae black; third joint as broad as long, rounded; 

 arista black, about equal in length to width of face; face between 

 eye and lateral oral margin slightly narrower than width of third 

 antennal joint; mesonotum with very inconspicuous pale pile, a few 

 longer hairs intermixed; femora black; fore and mid tibiae yellow- 

 ish basally and apically ; hind tibia yellowish basally ; fore and mid 

 tarsi dark brown, paler basally; hind tarsi blackish; first tergite 

 black, the second tergite with a median posteriorly produced black 

 mark; remainder of second, the third and anterior half of fourth 

 yellowish brown, their sides briefly darkened, remainder of abdomen 

 blackish; wings smoky; squamae and plumula whitish; halteres 

 yellowish. Length 10 mm., wing 7.5 mm. 



Type locality. — Blue Mountains, Washington, June, 1924 (V. 

 Argo). 



Type.—Q2,t. No. 27741, U.S.N.M. 



XYLOTA RUFIPES Williston 



(Notes based on type in British Museum.) Arista distinctly 

 longer than width of face; metathoracic spiracle distinctly smaller 

 than third antennal joint; metasternum merely pubescent; abdomen, 

 except for the black basal segment, purplish red ; legs reddish brown, 

 hind tarsi darker; hind femur long and slender; hind trochanter of 

 male spurred. Length 10-11 mm. 



Tyj)e locality. — Omilteme in Querrero, 8,000 feet, Mexico (H. H. 

 Smith). 



Type. — In British Museum. 



XYLOTA STENOGASTER Wiliston 



(Notes based on type in British Museum.) Antennae blackish 

 brown; third joint large; abdomen deep shining steel-blue, hind 



