ALDRICH AND DARLINGTON. 75 



ANOROSTOnA Loew. 

 A humeral and a propleural bristle; three supra-alar ; one pre- 

 sutaral ; two notopleural ; one large and one small mesopleural 

 bristle; four dorsocentral bristles ; two fron to-orbital bristles. Eyes 

 transversely ovate; cheeks broad; face receding, the front edge of 

 the mouth entirely obliterated (i. e. the lower part of the face is 

 not set off from the oral cavity by a sharp margin). The sixth 

 longitudinal vein extends to the margin of the wing. The distinct 

 mesopleural bristle seems to be a valuable generic character. 



TABLE OF SPECIES. 



1. With only one sternopleural bristle 2. 



With three or four sternopleural bristles grandis n. sp. 



2. Wing with a black spot covering both cross-veins opara Coq. 



Cross-veins vyitb separate spots 3. 



3. Thorax black in ground color, with gray dust niaculaia n. sp. 



Thorax yellow in ground color, with yellowish dust inarginata Lw. 



Anorostoma grandis Darlington, n. sp. 



Length 7.3 mm. ; of wing, the same. 



Large, blackish species, pulvilli long and conspicuous (in the male); hind 

 femora exceptionally stout. 



Occiput and front brownisli ; a black stripe extends from the ocellar bristles to 

 the occiput; front densely pubescent below; cheeks straw yellow, about the 

 width of the eye; eyes transversely oval ; antennte brownish, third joint oval ; 

 arista short, bare ; face strongly receding below ; vibrissa? one on each side, clo.«e 

 together, rather delicate. 



Thorax light brown; dorsum rather densely sprinkled with dark brown dots 

 from which the small hairs arise, and with larger dark brown spots from whidi 

 the bristles arise ; scutellum reddish-brown, bare except the ordinary four bris- 

 tles; besides the one propleural bristle a propleural hair; two bristles and a hair 

 on the posterior margin of the mesopleura, which is otherwise bare ; on the upper 

 edge of the sternopleura is a row of from three to four strong bristles (three on 

 one side; on the other four, two of which are a little smaller); sternopleura 

 pubescent below. 



Abdomen black, hypopygium yellow, globose. 



Wings almost hyaline; the end of the auxiliary vein and the small and laige 

 cross-veins infuscated ; the cloud on the small cioss-vein is preceded and follow* d 

 by whitish areas, and tliere is another of these on the costa beyond the end of 

 the auxiliary, also a few faint ones in the base of the wing. 



Legs yellow; front femora infuscated, middle femora comparatively slender, 

 hind ones exceptionally stout; the last with a black spot near the distal end : all 

 the pulvilli long and conspicuous, dirty white in color. 



One male specimen. Aldrich : Pacific Grove, Cal., May 9th ; 

 collected in a wet meadow in the woods near the seashore about a 

 mile south of Pt. Pinos Light. 



TRANS. AM. ENT. SOC. XXXIV. MARCH, 1908 



