HELEOMYZID FLIES NORTH OF MEXICO—GILL 503 
femora with several small bristles on anterior side; hind femora with 
about 4 strong bristles near the distal end on anterodorsal side. 
Wings clouded with brown along crossveins and near the tips of the 
longitudinal veins. 
Abdomen yellowish orange, with tergites darkened along posterior 
margins. 
Lenetu.—5.0-6.0 mm. ; 
- Disrrisution.—Alaska, British Columbia, Saskatchewan, Wash- 
ington, Idaho, Oregon, California, Arizona, New Mexico, Utah, Colo- 
rado; collected during every month except January. 
Brotoey.—S. limbata (Thomson) has been reared from the fungi 
Lepiota rhacodes and Tricholoma species (Kessel and Kessel, 1939). 
It has also been taken in a light trap by Wirth (specimens in USNM). 
Suillia sororcula Czerny 
FIqureE 4 
Suillia sororcula Czerny, 1926, p. 53. 
This species was described from a single female from San Mateo 
County, Calif. Dr. H. Weidner, Zoologisches Staatsinstitut und 
Zoologisches Museum, Hamburg, informed me that Czerny’s type 
was burned in the air raids of World War IJ; therefore I have relied 
entirely on the original description for my concept of the species. 
I have seen several specimens from San Mateo and nearby counties 
which appear to be this species. The species is very similar to Suillia 
limbata (Thomson), including the structure of the male terminalia. 
In S. sororcula Czerny, the cheeks appear to be narrower, the eye is 
higher than wide and the general body coloration is lighter. 
MALE AND FEMALE.—Front yellow to orange; antennae yellowish 
brown; aristae dark brown to black, except yellowish at base; remainder 
of head pale yellow, becoming whitish on cheeks; vibrissae strong; a 
single row of buccal setae, those immediately behind the vibrissae 
much stronger than the posterior ones, cheek-eye ratio from 0.11 
to 0.20. 
Thorax yellow, darker reddish orange on mesonotum; scutellum 
with 1 or more setae laterally between the bristles: legs yellow, tarsi 
darkened, similar to S. imbata (Thomson); wings similar to S. limbata 
(Thomson), except clouding much more faint in most of the specimens 
I have seen; abdomen yellow to brownish, with hind edges darkened. 
Lrenetu.—4.5-6.0 mm, 
DistripuTion.—California (Counties of San Mateo, Contra Costa, 
and Marin); January, April—July. 
