54 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



elevation. I found it quite abundant on marshy ground at Wells, 

 Nevada. 



Holotj'^pe and allotype in the United States National Museum, and 

 taken at Wells, Nevada. 



Type.— Male, No. 22985, U. S. N. M. 



No. 17. DOLICHOPUS PALUSTEK Mclander and Brues. 



Dolichopus paluster MELANDERand Brues, Biol. Bull., vol. 1, 1900, p. 136, figs. 



Male. — Length 5-5.5 mm.; of wing 4.5-5 mm. Face wide, only a 

 little narrowed below, covered with brown or yellowish-brown 

 pollen. Front green, sometimes with bronze reflections. Antennae 

 (fig. I7a) wholly black; third joint a little longer than wide, somewhat 

 oval in outline. Proboscis and palpi black with black hairs, orbital 

 cilia wholly black. 



Thorax green, with indications of two coppery lines on the dorsum 

 and sometimes blue reflections; pleurae more black with whitish 

 pollen. Abdomen green with bronze and sometimes blue reflections, 

 with scarcely a trace of white pollen on its sides. Ilypopygium 

 black; its lamellae of moderate size, oval, whitish with a sharply 

 defined black border which is widest on apical margin and very 

 narrow on lower edge, jagged and bristly at lower apical corner, 

 fringed above with rather long but delicate brown hairs. Coxae, 

 legs and feet black. Fore coxae with white pollen and black hairs 

 on their anterior surface. Middle and hind femora each with two 

 preapical bristles, placed one before the other; posterior pair ciliated 

 with black hairs on lower inner edge; these hairs are brown or even 

 whitish in same individuals and about three-fourths as long as the 

 width of the femora. IVIiddle tibiae with a long bristle below and one 

 longer than the others beyond the middle on upper surface, hind 

 tibiae thickened, with the glabrous stripe on upper surface quite 

 distinct but narrow. Fore tarsi a little longer than their tibiae, the 

 joints of decreasing length but the fifth not shorter than the fourth; 

 first joint nearly as long as the three following taken together. Middle 

 tarsi a little longer than their tibiae. Hind tarsi one and a third 

 times as long as their tibiae. Calypters and halteres yellow, the 

 former with black cilia. 



Wings (fig. 17) gray, usually tinged with brown in front of the third 

 or even back to the fourth vein, the veins often narrowly bordered 

 with brown; costa with a very small enlargement at tip of first vein; 

 last section of fourth vein moderately bent near its middle; hind 

 margin of wing scarcely indented at tip of fifth vein; anal angle not 

 prominent, but the wing rather wide at its middle. 



Female. — Face as wide as the front: hind tibiae not thickened; 

 hind femora with only very short, delicate hairs on lower inner edge; 



