21 



lowing segments, black; sides of face. whitish pilose, hairs of body 

 chiefly black; mesonotum dark gray pruinose, two vittae and the 

 lateral margins whitish gray pruinose; wings hyaline, tinged with 

 yellowish at base and along the costa, stigma brownish. Length 7 

 mm. A female specimen. Type No. 6708. U. S. National Museum. 

 Ormsby County, Nevada. 

 565 LepTis incisa Lw. Stanford University. 



1739 Pheneus opacus Coquillet, new species. 



Black, the first two joints of attennae, proboscis, bases of seg- 

 ments two to six of abdomen, stems of halteres, coxae, front and 

 middle femora and their tibiae, also bases of tarsi, yellow, the very 

 elongate hind femora and tibiae dark brown; head gray pruinose, 

 face and lower part of front slightly over twice as wide as distance 

 between the posterior ocelli, front greatly widening towards the 

 vertex, at the lowest ocellus twice as wide as at lower edge; first 

 joint of antennae one and one-half times as long as the second, the 

 latter almost as long as the third, the two last mentioned joints 

 slightly wider than long, arista nearly one and one-half times as 

 long as the antennae proper, indistinctly three-jointed, the first 

 joint twice as long as wide, the second slightly over twice as long 

 as the first, the two together two-thirds as long as remainder of 

 arista; occiput strongly convex; thorax opaque, grayish pruinose, 

 mesonotum marked with three blackish vittae, the median one 

 divided by a gray line; abdomen polished; wings hyaline, veins 

 black, fourth posterior cell closed in one wing but distinctly open 

 on the other, anal cell narrowly open. Length 5 ram. A male 

 ppecimen. Type No. 6707, U. S. National Museum. Ormsby 

 County, Nevada. 



STRATIOMYIDAE. 



133 Sargus viridis Say. Ormsbj^ County, Nevada and Stanford 



University. 



134 Beris annulifeka Bigot. Ormsby County. Nevada. 

 738 StraTiomys maculosa Lw. Ormsby County, Nevada: 



24 Odontomyia arcuata Say. Stanford University. 

 736 Odontomyia binotaTa Lw. Stanford University. 

 970 Odontomyia inaequalis Lw. Stanford University. 



38 Nemote^uS Tristis Bigot. Stanford University. 



TABANIDAE. 



1740 Chrysops noctifer OS. Stanford University. 

 109 Chrysops surdus OS. Ormsby County, Nevada. 



1741 Tabanus opacus Coquillet, new species. 



Near rhoi)ibi(us, but the frontal subcallus is gray pruinose, the 

 gray spots of abdomen greater in number and extent, etc. Black, 



