ART. 23 TWO-WINGED DOLICHOPODID FLIES VAX DUZEE 9 



Dorsum of thorax green with gray pollen in front and on the 

 sides; scutellum with two pair of marginal bristles. Abdomen dark 

 green, dulled with gray pollen, which is scarcely tfiicker on the sides 

 and leaves a median blackish stripe in certain lights. Hypopj^gium 

 (fig. 6) and its lamellae black, the latter rather long and narrow, 

 fringed with pale hairs; the tip of the hypopygium is cleft, rounded 

 and yellowish toward the end; inner appendages yellow, small, 

 rounded at tip; they are not visible in the California specimen. 



Fore coxae yellow, blackened at extreme base; middle and hind 

 pairs black; all the hair and bristles of the coxae are black. Fore 

 and middle femora and tibiae wholly yellow ; fore femora with long 

 black hair on the posterior surface; middle ones with long black 

 hair on the loAver edge of both anterior and i^osterior surfaces; 

 these are scarcely as long as the width of the femora. Hind femora 

 yellow, their tip black for one-third their length, still the yellow 

 extends to the tip on the lower edge ; they have a row of moderately 

 long, delicate hairs on lower outer edge and a few longer black 

 bristles near the tip. Hind tibiae yellow, with the tip becoming 

 brown. Fore and middle tarsi with the first joint brownish, their 

 tips and the following joints black; joints of fore tarsi as 

 39-16-1 1-T-7. Hind tarsi wholly black, with the first joint a little 

 longer than the second. Calypters broadly black at tip, their cilia 

 yellowish. Halteres yellow. 



Wings' tinged with brownish-gray; third vein bent backward at 

 tip; last section of fourth vein bent near its middle, considerably 

 arched, so that it is farther from third vein at tip than at the bend, 

 ending just back of the apex of the wing; last section of fifth vein 

 nearly twice as long as the cross vein. 



Female. — Face and front covered with grayish-white pollen; third 

 antennal joint not as long as wide; arista nearly apical, more than 

 three times as long as the antenna ; fore coxae yellow ; femora yellow 

 with short hair, posterior pair more or less blackened at tip, some- 

 times almost wholly yellow; all tarsi yellow at base; hind tibiae 

 infuscated at extreme tip only. Wings with the third and fourth 

 veins parallel toward their tips; last section of fifth vein twice as 

 long as the cross vein. Cilia of the calypters black. The pollen of 

 the thorax and abdomen is more white, not gray as in the male ; that 

 of the abdomen is confined to the sides. 



Eedescribed from 4 males and 10 females. Doctor Aldrich took 

 2 males and 4 females in Washington, May 13, to July 6 ; all the rest 

 were taken by him and myself in California from April 13 to May 16. 

 This was described from Alaska. 



9123—25 2 



