HELEOMYZID FLIES NORTH OF MEXICO—GILL 529 
with a type specimen of each sex. Later I examined more types in 
the U.S. National Museum. 
MALE AND FEMALE.—Vertex, ocellar triangle, and frontal plates 
dark gray; antennae becoming dark brown on third segment; re- 
mainder of head dirty yellowish orange; anterior fronto-orbital bristle 
\% to % the height of the posterior bristle; cheek-eye ratio from 0.73 
to 0.85; eye with flattened appearance similar to #. simplex Coquillett. 
Mesonotum dark grayish brown with humeri and scutellum yel- 
lowed; pleura yellowish brown; thoracic chaetotaxy similar to LE. 
spinosa (Garrett), except 1 sternopleural bristle (sometimes a strong 
hair in front of the bristle). 
Legs yellow, not darkened distally; chaetotaxy as in LE. spinosa 
Garrett; wings hyaline; abdomen dark brown with grayish pollinosity ; 
epiphallic process of male with several (more than five) short spines on 
dorsal side of distal end. 
Lrenetu.—3.5—4.0 mm. 
DistrRiBuTION.—The type series was taken from a prairie dog hole, 
Laramie, Wyo., 10 March 1927, by C. L. Corins. There is one syn- 
type female from Oxbow, Saskatchewan, 8 May 1907, but I believe 
that this specimen is probably /. melanderi (Garrett). The cheek- 
eye ratio of the latter is 0.6; the eye does not have the characteristic 
flattened appearance of E. aldrichi Czerny. A series of males collected 
at the entrance to a Cynomys burrow, Val Marie, Saskatchewan, 11 
June 1955, by J. R. Vockeroth is in the Canadian National Collection. 
Eccoptomera melanderi (Garrett) 
Viatica melanderi Garrett, 1925a, p. 2—Czerny, 1930, p. 442. 
This species is very similar to H. aldrichi, but the eye is larger and 
not flattened in appearance. 
I have examined the type male in the Garrett collection and two 
females in the collection of the California Academy of Sciences. 
MALE AND FEMALE.—Similar to EH. aldricha Czerny, except as 
follows: anterior fronto-orbital bristle about one-fourth (or less) the 
height of the posterior bristle; cheek-eye ratio from 0.50 to 0.65; 
surface of eye convex; mesonotum dark bluish gray, with pleura 
similar but lighter, becoming yellowish at edges of sclerites and 
toward the propleura; scutellum yellowed toward the apex; legs may 
be darkened distally; epiphallic process of male with 5 short spines 
on dorsal side of distal portion. 
Lenetu.—3.5-5.0 mm. 
DistriBuTion.—California, Alberta, Idaho, Colorado; March, 
June-August. It was previously noted that one of the syntypes of 
E. aldrichi Czerny appeared to be E. melanderi (Garrett) (Oxbow, 
Saskatchewan, 8 May 1907). 
