76 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



Thorax dark green with coppery reflections, shining; pleurae 

 (lulled with gray pollen. Abdomen dark bronze green with black 

 incisures and white pollen on the sides of the segments. Hypop^^gium 

 black; its lamellae rather large, somewhat round in outline but nar- 

 rowing suddenly into the stem, white with a broad black border on 

 apical margin, which is a little jagged and fringed with long delicate 

 hairs. 



Coxae and femora black; trochanters and tips 6f femora yellow, the 

 3^ellow more extensive on middle pair. Middle and hind femora each 

 with two preapical bristles, placed one before the other, the latter 

 without. cilia below. Tibiae yellow; posterior pair black at tip for 

 one-fourth their length; a little thickened, especially at tip, with a 

 rather broad glabrous stripe on upper surface for nearly their whole 

 length; this stripe seems to have an almost golden reflection, in certain 

 lights, on the yellow portion (probably from a golden yellow pollen); 

 the middle tibiae also show a trace of this color. Fore tarsi a very 

 little longer, middle tarsi about the same length as their tibiae, both 

 l)lack from the tip of the first joint. Hind tarsi wholly black. 

 Calypters and halteres yellow, the former with black cilia. 



Wings (fig. 36) tinged with dark gray and with an ill-defined cloud 

 along the costa, from a little be3^ond the tip of first vein to the tip 

 of third and extending back to or beyond the third vein, cross-vein 

 also a little clouded; costa scarcely enlarged at tip of first vein; last 

 section of fourth vein a little bent before its middle;, tips of third 

 and fourth veins rather widely separated; liind margin only a little 

 indented at tip of fifth vein; anal angle of wing rounded, not 

 prominent. 



Feinale. — Agrees with the male, except that the face is wide ; third 

 antennal joint smaller, and the clouds on the wings ver}- indistinct. 

 The middle tibiae with one bristle below, their basitarsi without a 

 bristle above. 



Described from 3 males and 1 female wliich I took at Wells, 

 Nevada, June 6, 1915. 



Type.—Male, Cat. No. 22995, U.S.N.M. 



No. 37. DOLICHOPUS BARBICAUDA, new species. 



Male. — Length 4.3 mm.; of wing 3 mm. Face rather narrow, 

 white, scarcely silvery, and with a slight yellowish tint. Front green 

 with bronze reflections, more blue in one specimen. Antennae (fig. 

 37a) wholly black; third joint only a little longer than wide, ovate, 

 but with a rather sharp point at tip. Lower orbital cilia yellowish 

 white, the black cilia reaching down the middle of the eye. 



Thorax green with bronze reflections, which sometimes form one 

 to three vittae on anterior part of the dorsum; in one specimen the 

 reflections are blue and the scute! lum is almost violet; pleurae more 



