28 



black; wings yellowish gray. Length 2.S mm. A single specimen. 

 Stanford University, California. Type No. 7680, U. S. National 

 Museum. 



OSCINIDAE. 



156 MEROMYza AMERICANA Fh. Occurs in all three regions. 

 39 Chlorops assimii^is Macq. Stanford University. 



1776 Chlorops crocota Lw. Ormsby County, Nevada. 



1778 Chlorops liTurata Adams. Ormsby County, Nevada. 



1777 Chlorops proxima Say. Stanford University. 

 557 Chlorops kubida Coq. Stanford University. 



1779 Elachiptera nigriceps Lw. Ormsby County, Nevada. 

 105 Hippelates microcentrus Coquillet, new species. 



Black, the lower part of front, sides of face, cheeks, palpi, ex- 

 treme bases of tibiae, and the tarsi except their apices, yellowish, 

 knobs of halteres white; frontal triangle polished, extending 

 slightly below middle of front; thorax thinly gray pruinose, the 

 pleura, except along the upper edge, polished, abdomen polished; 

 spurs of hind tibiae rather small; wings hyaline, apex of second 

 vein nearly twice as far from that of the first as from the third. 

 Length 1.5 mm. Ten specimens. Stanford University. Type No. 

 7679, U. S. National Museum. 

 989 OsciNis TRiGRAMMA Lw. Stanford University. 

 1214 MosiLLUS AENEUS Fall. Clareraont, California, and also in 

 Ormsby County, Nevada. 



EPHYDRIDAE. 



1218 OcHTHERA MANTIS DcG. In the mountains near Claremont. 



93 Pelina Truncatella Lw. Ormsby county, Nevada. 

 1271 Pelina bkevis Wlk. In the mountains near Claremont, Cal. 



1780 Coenia bisetosa Coq. Ormsby County, Nevada. 



1781 PsiLOPA COMPTA Meig. Stanford University. 



102 Hydrellia scapularis Lw. Stanford University. 

 987 Pelomyia occidentalis Will. Stanford University. 



PSILIDAE. 



1782 Chyliza robusta Coquillet, new species. 



Black, the head except center and lower part of occiput, the 

 antennae except the aris.ta, the scutellum, coxae, broad apices of 

 femora, and the tibiae, reddish yellow, tarsi pale yellow, halteres 

 whitish, front yellowish brown; hairs pale yellow, the bristles black; 

 face distinctly retreating below, occiput strongly projecting behind 

 the eyes, flattened posteriorly; wings grayish hyaline, marginal 

 cell dark gray, costal cell yellowish brown, third and fourth veins 



