548 PROCEEDINGS OF THE NATIONAL MUSEUM VoL. 113 
sometimes only the hindmost sternopleural bristle is well developed. 
Legs yellowish orange; forefemora darkened with a grayish pol- 
linosity; femora thickened; similar to A. wilcozi Curran and A. 
grande Darlington. 
Wings tinged with yellow; anterior crossvein darkened; posterior 
crossvein may be slightly browned. 
Abdomen a non-pollinose orangish yellow to reddish yellow, often 
rather shining. 
FEeMALE.—Similar to male, except femora less conspicuously 
thickened. 
DistripuTion.—Washington, Oregon, California (coastal areas); 
March—June, August. 
Anorostoma marginatum Loew 
Figures 44, 53 
Anorostoma marginata Loew, 1862a, p. 223.—Aldrich and Darlington, 1908, 
p. 77.— Curran, 1933, p. 6. 
Anorostoma marginatum Loew, Czerny, 1924, p. 116. 
Anorostoma raca Garrett, 1923, p. 244. New synonymy. 
Most specimens of Anorostoma which I found in various collections 
throughout the country were labelled “‘marginatum,” yet relatively 
few were actually this species. This discrepancy may stem from the 
fact that A. marginatum Loew was the first species described from 
North America and from the fact that Garrett’s descriptions are 
inadequate for use in discriminating his several related species which 
resemble A. marginatum Loew. 
Type specimens clearly contradict Curran’s (1933) statement that 
A. marginatum Loew is synonymous with Garrett’s A. coloradense. 
The placement of A. raca Garrett in synonymy with A. marginatum 
Loew is based on the examination of a male specimen in the Garrett 
collection. (The type of A. raca Garrett is in the Canadian National 
Museum.) The specimen was determined by Garrett; its terminalia 
are mounted on a slide. Garrett indicated in a personal interview that 
the distinctness of the male terminalia was the basis on which he 
described his species; he had not had the opportunity to examine the 
types of A. marginatum Loew, which are represented by 2 males 
(No. 13195) in the Museum of Comparative Zoology at Harvard. 
Matr.—Front yellowish orange, aristae dark brown, remainder of 
head pale yellow. Cheek-eye ratio from 0.6 to 0.8. 
Mesonotum yellow to yellowish orange (may be almost grayish 
black in ground color), remainder of thorax pale yellow; 1 to 3 irregular 
rows of setae between the dorsocentrals; legs yellow; wings tinged 
faintly with yellow, especially along crossveins and costal margin. 
Abdomen yellow, may be a little darkened along middorsal line. 
