HELEOMYZID FLIES NORTH OF MEXICO—GILL 539 
to the disk of the scutellum; dorsocentrals and sometimes other 
bristles of the mesonotum arising from brown patches; pteropleuron 
usually with a strong bristle and several neighboring hairs; legs 
yellowish brown, femora with dark gray pollinosity, especially the fore- 
femora; tibia and tarsi reddish brown; fourth tarsal segment of hind 
leg of male about as broad as long; wings hyaline, anterior crossvein 
slightly darkened; abdomen ash gray, sometimes brownish; epandrium 
of male turned inward ventrally, the distal edge slightly concave and 
rounded at the anterior and posterior corners. 
Lrenetu.—3.0-4.5 mm. 
DistriBuTiIoN.—British Columbia, Washington, Oregon, Idaho, 
Utah, (Knowlton and others, 1939), Alberta, Saskatchewan, Montana, 
Wyoming, Colorado, New Mexico, Nebraska; March—October, 
December. 
Pseudoleria parvitarsus Garrett 
FiaurE 38 
Pseudoleria parvitarsus Garrett, 1925b, p. 2. 
Pseudolerra parvitarsus Garrett is easily distinguished from other 
species in the genus by the fact that the hind basitarsus of the male 
is shorter than the following segment. In P. parvitarsus Garrett, 
P. robusta Garrett, and P. subrobusta, new species, the male postab- 
domen is unusually large. Whereas in the other species of the genus 
the terminalia are folded under and more or less concealed, they are 
usually conspicuously exposed in the three species mentioned. 
The coloration of this species is: vertex and back of head gray, 
antennae reddish orange to dark brown, aristae dark brown, remainder 
of head yellow to yellowish brown; thorax ash gray to brownish, 
sometimes with thin median vitta and the dorsocentrals arising from 
small brown spots; legs yellow to yellowish brown, femora usually 
dark and with a grayish pollinosity; wings hyaline with crossvein not 
darkened; abdomen yellowish brown to ash gray. 
The cheek-eye ratio is about 0.50. The hypandrium of the male 
has two stout spines as in P. robusta Garrett. 
Lreneta.—4.0—5.0 mm. 
DistTRIBUTION.—British Columbia, California, Nevada, New Mex- 
ico, Alberta, Saskatchewan, Montana, South Dakota, Nebraska, 
Indiana; April-June, August—October. 
BroLtoacy.—Specimens have been collected in picric acid traps at 
depths of 350 to 750 feet in the Carlsbad Caverns, according to labels 
on specimens in the U.S. National Museum. Other specimens in 
this institution were collected from the nest of a burrowing owl and 
from Atripler canescens. Specimens in the Carnegie Museum and 
Canadian National Collection were collected at a burrow of Cynomys. 
