546 PROCEEDINGS OF THE NATIONAL MUSEUM voL. 113 
that it is much larger, the length being 7.0mm. The wings have less 
whitish area than either A. cinerewm Curran or A. maculatum Darling- 
ton; thus in A. opacum Coquillett the marginal cell (cell R;) is entirely 
gray, without any whitish areas. The cheek-eye ratio is about 1.0. 
Thoracic color patterns are used in Curran’s key, but are not 
reliable in separating A. maculatum Darlington from A. opacum 
Coquillett. Four golden-brown vittae appear on the mesonotum 
of the type of A. opacum Coquillett, but in A. maculatum Darlington 
this character is variable and some specimens have evidence of meso- 
notal vittae. The mesopleuron of A. opacum Coquillett has a golden 
cast to the upper half, but A. maculatum Darlington may also show 
this character. 
DistrisutTion.—The only specimen which I have seen is the type, 
collected in Los Angeles County, Calif. 
Anorostoma grande Darlington 
FiaguRE 42 
Anorostoma grandis Darlington, in Aldrich and Darlington, 1908, p. 75. 
Anorostoma grande Darlington, Czerny, 1924, p. 1138.—Curran, 1933, p. 3. 
This species is very similar to Anorostoma wilcori Curran. I have 
found the shading of the wings a useful character in separating the 
two species. In A. grande Darlington the wings are very clear, with 
no indication of a yellow tinge, whereas in A. wilcori Curran there 
is a definite yellowish tinge to the entire wing. The color of the 
front was used by Curran to separate these two, the front being 
brownish in A. grande Darlington and reddish in A. wilcoxi Curran. 
This front coloration appears to be a useful supplementary character. 
The male terminalia of the two species are very similar. 
Maty.—Front and vertex brown, with a grayish pollinosity; front 
with setae on anterior half or more; back of head yellowish brown, 
pollinose; dense setae between the eye and antenna; face and cheeks 
yellowish; antennae dark brown, aristae black and minutely pubes- 
cent; oral vibrissae strong, a single irregular row of long buccal setae; 
cheek-eye ratio from 0.75 to 1.1. 
Mesonotum with many brown spots at bases of hairs and bristles; 
remainder of thorax yellowish or yellowish brown and with a grayish 
pollinosity; propleural bristle strong; mesopleuron with 1 or 2 strong 
bristles and 1 or more smaller hairs along the hind margin; sterno- 
pleuron with 2 to 4 bristles and 2 or 3 rows of hairs down the middle 
to the longer, more numerous hairs between the coxae; remainder of 
pleura bare. 
Legs yellowish, sometimes darkened distally, and with a grayish 
