110 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



preapical bristle, the latter without cilia below. Tibiae yellow; 

 posterior pair with their tips blackened ; the glabrous stripe on upper 

 surface wide, extending upon the inner side, not quite reaching the 

 })ase, but reaching the tip as a yellow streak across the black; it is 

 divided by the inner row of large bristles which is continued to the 

 tip by little black hairs. Fore tarsi a little longer than their tibiae, 

 yellow, infuscated at tip. Middle tarsi (fig. 66a) one and a fourth 

 times as long as their tibiae; first three joints slender, yellow, fourth 

 and fifth joints black, compressed, densely fringed with black hairs 

 above; fourtli joint about as long as third, fifth about half as long, 

 somewhat orbicular in outline but nearly straight below. Hind 

 tarsi wholW black. Calypters and halteres yellow, the former with 

 black cilia. 



Wings (fig. 66) grayish; costa not enlarged at tip of first vein; last 

 section of fourth vein a little bent beyond its basal third ; anal angle 

 very prominent; hind margin of w^ng scarcely indented at tip of 

 fifth vein, but witli a sinus from this point to the anal angle. 



Female. — Face wide as the front, silvery white; third antennal 

 joint about as long as wide, otherwise the antennae are about as in 

 the male; legs and feet as in the male except that the middle tarsi 

 are plain and only a little longer than their tibiae; hind margin of 

 wing without a sinus and the anal angle not quite so prominent as in 

 the male. The fore coxae are wholly yellow; middle tibiae with one 

 bristle below, their basitarsi without a bristle above. 



Redescribed from 1 male and 3 females taken by J. M. Aldrich; 

 1 pair at Craig's Mountain, Idaho; 2 females at Emigration Canyon, 

 Utah, 1 on July 8, 1911, the other on July, 21, 1917, at 7,000 feet 

 elevation. 



The type specimen in the United States National Museum, No. 

 5236, is from Popof Island, Alaska, taken July 8, 1899; it is in poor 

 condition ; it appears to be a male, but I could not see the hypopygium 

 and the middle tarsi are broken off; with this stands a female from the 

 same place, taken July 10, and also a specimen taken on the top of 

 the Las Vegas Range, New Mexico, June 28 (T. D. A. Cockerell). 



No. 67. DOLICHOPUS FLAVILACERTUS, new species. 



Male. — ^Length 4-4.5 mm.; of wing 3.5-3.75 mm. Face very 

 narrow, golden yellow, more silvery near the proboscis, front dark 

 green. First antennal joint wholly yellow, second and third joints 

 black (fig. 67(2), third nearly orbicular in outline but slightly pointed 

 at tip. Orbital cilia wholly black. 



Thorax green with more or less distinct coppery reflections, which 

 sometimes form stripes along the rows of acrostichal bristles; 

 pleurae dulled with gi'ay pollen. Abdomen dark green with large 



