6 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.63, 



black, second joint about three-fourths as long as the first, which 

 has longer hair on the outer surface. Calypters yellow with black 

 tips and yellow cilia, still some of the hairs appear brown in certain 

 lights. Halteres yellow, their stem darker. 



Wings nearly hyaline, veins black; third vein bent backward; 

 last section of fourth vein rather abruptly bent at its middle, par- 

 allel with third toward the tip, ending just back of the apex of 

 the wing; last section of fifth vein nearly twice as long as the 

 cross vein. 



Female. — One female taken at Fairbanks Julv 4 seems to belono; to 

 the same species as the male described above. It has the face and 

 front wide, covered with coarse yellowish gray pollen, the former 

 with its suture near apical third, its lower edge rounded. Antennae 

 w^th the third joint but little longer than wide ; first joint as long as 

 third, with many hairs above. Thorax almost black, Avith thick 

 coarse yellowish gray pollen which conceals the ground color on 

 much of the fore part of the dorsum ; scutellum with four large mar- 

 ginal bristles and distinct hairs on its disk. Abdomen depressed, 

 almost without yellow on its sides, coppery, darker on the sides; 

 its hairs, including the long ones on the sides of first segment, black. 

 Hairs of the coxae and legs largely black. Fore and middle femora 

 black with their tips broadly yellow: they have a few small, pale 

 hairs below, the anterior pair with rather long black hair on their 

 posterior surface. Hind femora yellow with apical third black. All 

 tibiae yellow, hind ones with apical sixth black. Fore and middle 

 tarsi black from the tip of the first joint, which is as long as the 

 last four joints taken together. Hind tarsi and the calypters as in 

 the male. Wings grayish, veins black; venation as in the male, ex- 

 cept that the third vein is not bent backward quite as much. 



Described from one pair taken at Fairbanks, Alaska, Julv 2 and 4. 



T'ype.— Male, Cat. No. 25958, U.S.N.M. 



Genus PORPHYROPS Meigen. 



Porp7iyroi)S ]\Ieigen, Syst. Beschr., vol. 4, p. 45, 1824. — Schineu, Fauna Aus- 

 trinca, vol. 1, p. 196, 1862.— Loew, Smiths. Jlisc. Colls., No. 171. pp. 142-146 

 and 340, 1864.— Wheeler, Proc. Calif. Acad. Sci., vol. 2, pp. 33-3o. 1S99.— 

 Becker, Nova Acta, vol. 103, pt. 3, pp. 208-229, 1918.— Lundbkck. T>ipferii 

 Dnnica, pt. 4, pp. 252-271, 1912. 



PORPHYROPS ELEGANTULA Meigen. 



PorphyroiJS elcgnntida JIeigen. Syst. Beschr., vol. 4, p. 51. 1824. — I.ttndreck, 

 Diptera Danica, pt. 4, p. 260. 1912. 



One female taken at Fairbanks, Alaska, June 80. Described from 

 Europe. I have seen several males and females taken by Prof. 

 James S. Hine in Alaska ; it was from his material that I was able \o 

 determine the species. 



