ART. 22 , LITTLE KNOWN DIPTEKA ALDEICH 7 



Described from two males. The type was taken at Kaslo, British 

 Columbia, June 11, by Dyar and Caudell; the paratype was col- 

 lected at Riverside, Yellowstone Park, August 4, 1918, by Prof. A. 

 L. Melander. 



Type.— Cat. No. 28882, U.S.N.M. 



Genus MESEMBRINA Meigen 



Mesembrina Meign, Systemat. Beschreib., vol. 5, 1826, p. 10. 

 Hypodermodes Townsend, Proc. Ent. Soc. Wash., vol. 14, 1912, p. 46. — Seguy, 

 Anthomyides de France, 1923, p. 363. 



MESEMBRINA TRISTIS, new species 



Resembles mystacea, but the pile of the thorax is black and less 

 dense, and the pale pile of the abdomen begins gradually near the base. 



Female. — Front broad (measuring 0.36, 0.37, 0,37 of head width in 

 the three specimens) . Head black, only palpi and second antennal 

 joint reddish yellow. Pollen of face brown ; back of head and vertex 

 with only black hair. 



Thorax and scutellum shining black, with dense erect black pile, 

 longer and denser on and just before the scutellum. Chaetotaxy of 

 disk of mesonotum delicate, hardly distinct from the pile. Calypters 

 blackish. Abdomen shining black, with black pile at base about 

 to liind edge of first segment; thence to apex with hght yellow pile, 

 becoming much longer toward apex and extending to venter in that 

 region. 



Legs black. Wings clouded along the veins. Venation as in 

 mystacea. 



Length, 14 to 15 mm. 



Described from three females collected by D. C. Graham in the 

 mountains of Szechuen Province, China. Two, including the type, 

 wefe collected in Yellow Dragon Gorge near Songpan, altitude 12,000- 

 14,000 feet; the other near Tatsienlu, 13,000-14,500 feet. 



Type.— Cat. No. 28901, U.S.N.M. 



This species would belong to Hypodermodes Townsend if that were 

 valid. I can see, however, no sufficient characters to justify its 

 separation from Mesembrina. 



Family CALLIPHORIDAE 



Genus METALLEA Van der Wu!p 



Metallea Van der Wulp, Tijdsch. v. Ent., vol. 33, 1880, p. 174. — Townsend, 

 Records Ind. Mus., vol. 13, 1917, pt. 4, p. 193. — Senior-White, Records Ind. 

 Mus., vol, 27, 1925, pt. 2, p. 90. 



METALLEA ILLINGWORTHI, new species 



Male. — Front very narrow, the eyes separated by only twice the 

 width of the front ocellus; frontal bristles beginning below the nar- 

 rowest place and scarcely reaching to the antennae. The whole head 



