HELEOMYZID FLIES NORTH OF MEXICO—GILL 547 
pollinosity; 6 to 8 stout bristles anterodorsally on hind femur, irregu- 
larly placed; femora thickened, especially the hind pair. 
Wings hyaline, without any yellowish tinge; crossveins and end of 
subcosta clouded with brownish black. 
Abdomen dark brown with grayish pollinosity; postabdomen yel- 
lowish to orangish brown; segments 2—5 with long bristles along lateral 
hind margins; scattered setae over entire dorsum of abdomen. 
FEMALE.—Similar to male, except for terminalia; femora not so 
markedly thickened. 
LrenetH.—5.5-7.0 mm. 
DistRIBUTION.—Washington, California (coastal areas); April, May, 
July, August. 
Brotocy.—The type male was collected in a “‘wet meadow in the 
woods near the seashore.”’ There is in the University of California 
(Davis) collection a series of 3 males collected on Cirsium occidentale. 
Anorostoma wilcoxi Curran 
Anorostoma wilcoxt Curran, 1933, p. 4. 
As noted above, Anorostoma wilcox, Curran and A. grande Darling- 
ton are very similar to each other, except for the color of the front 
and wings. As far as wing coloration is concerned, there appear to 
be no intermediate forms, and thus it is best to continue to consider 
the species distinct. 
DisrrisputTion.—Washington, Oregon, California (coastal areas). 
Records from all months except January, July, November, and 
December. 
Anorostoma alternans Garrett 
FIGuRE 43 
Anorostoma alternans Garrett, 1925b, p. 4.—Czerny, 1930, p. 447—Curran, 1933, 
p. 3. 
This species appears to be related to A. grande Darlington and 
A. wileoxi Curran, particularly inasmuch as the male terminalia show 
a similarity of structure. The non-pollinose reddish yellow abdomen 
distinguishes A. alternans Garrett from the other two species. 
Mauge.—Front yellowish orange; back of head, vertex, ocellar 
triangle, and frontal plates bluish gray, pollinose; antennae yellow 
to yellowish orange, aristae dark brown; remainder of head yellow to 
yellowish orange; oral vibrissae strong, a single row of buccal setae; 
cheek-eye ratio 0.62 to 0.85. 
Thorax bluish gray with grayish pollinosity; small brown spots at 
bases of dorsocentrals and minute spots at bases of many setae; 
chaetotaxy similar to A. wilcort Curran and A. grande Darlington; 
