ART. 23 TWO-WINGED DOLICHOPODID FLIES VAN DUZEE 13 



joint not longer than the two first taken together, rounded at tip; 

 arista inserted above the ti^j, about as long as the antenna. Orbital 

 cilia black; still, some of the lower ones more brownish in certain 

 lights. 



Dorsum of thorax green, dulled with brownish pollen, which 

 leaves a brown stripe on each side of the acrostichal bristles ; humeri 

 with numerous bristlelike hairs; scutellum with two pairs of mar- 

 ginal bristles and consj^icuous, rather long, black hair on its disk. 

 Abdomen green, covered with silvery white pollen, except the first 

 segment, Avhich has long, black hair on the sides; second segment 

 with even longer black hairs or bristles on the sides of the hind 

 margin; all the hair on the abdomen long and black. Hj'popygium 

 (fig. 9) black; its outer lamellae black, more or less yellow at base, 

 and with long black hairs; inner appendages are a pair of rather 

 small, black, nearly straight organs and a pair of large yellow 

 lamellae with a yellow hair at tip; these are much larger than the 

 narrow outer lamellae. 



All coxae black, tips of the anterior pair yellow ; fore and middle 

 pairs with long, stiff, black hairs, which are as long as their ^lick- 

 ness; posterior pair with two bristles and several hairs on outer 

 surface. All femora yellow; in one specimen all the femora are a 

 little blackened at extreme base, in another the fore femora are 

 blackened at base on lower posterior edge for more than one-third 

 their length, the other femora being wholly yellow. All femora 

 with long black hair, that on the fore pair on the lower and posterior 

 surfaces and that on the others on the anterior surface, especially 

 below. All tibiae wholly yellow, with strong bristles. All tarsi 

 black from the second joint, first joint of fore tarsi with minute 

 bristles or stiff hairs below, its joints as 58-16-10-8-11. Middle 

 tarsi with its joints as 59-26-18-10-10. Joints of hind tarsi as 

 49-35-23-10-11. Calypters whitish at base, apical half black, their 

 cilia long and black. Halteres yellow. 



Wings grayish; third vein bent backward at tip; last section of 

 fourth vein quite abruptly bent before its middle, parallel with 

 third at tip ; last section of fifth vein scarcely one and a half times 

 as long as the crossvein. 



Female. — Face wide, its suture nearly straight, pollen of the face 

 yelloAvish-gray ; lower line of the face a little pointed in the middle ; 

 third antennal joint about as long as wide; arista longer than the 

 antenna; hairs on the scutellum conspicuous; pollen of the thorax 

 rather thick, gray ; all femora and tibiae wholly yellow. First joint 

 of hind tarsi yellow with a black tip, longer than the second joint. 



Described from two males taken by F. R. Cole at Forest Grove, 

 Oregon, May 5, 1918; and one female taken at (xrangeville, Idaho, 

 by Dr. J. M. Aldrich. 



