14 PKOCEEDIjSTGS of the national museum. vol.64 



stigma dark brown; cord and outer end of cell 1st M^ seamed with 

 paler brown; cell i^^very short-petiolate ; basal deflection of Cu^ at 

 about two-fifths the length of cell 1st M^. 



Male. — Length, 10.5 mm.; wing, 11.6 mm. 



Rostrum and palpi dark brown. Antennae short, dark brownish 

 black. Head dark, brownish gray pruinose. 



Mesonotal praescutum gray pruinose with four conspicuous black 

 stripes, the intermediate pair separated from one another only by a 

 capillary gray line, these stripes becoming obliterated before the 

 suture; scutum dull gray, the lobes marked with darker; scutellum 

 pale, light gray pruinose; postnotum dark, gray pruinose. Pleura 

 dark, gray pruinose. Halteres obscure yellow, the knobs dark 

 brown. Legs with the coxae gray pruinose; trochanters yellowish 

 brown; femora obscure yellow, the tips broadly dark brown; re- 

 mainder of the legs dark brown. Wings with a yellowish tinge; 

 stigma dark brown; conspicuous paler brown clouds along the cord 

 and on m; very indistinct seams along the longitudinal veins; veins 

 dark brown. Venation: Rs long, angulated and spurred at origin; 

 i?2+3 a little shorter than Rs, R^ contiguous with the extreme tip of 

 R^; r-m at midlength of the deflection of Ri^-j petiole of cell R^ very 

 short; cell M^ present, its petiole longer than the cell; cell 1st M^ 

 closed, comparatively small, subrectangular, widened distally; m 

 and outer deflection of J/3 subequal; basal deflection of Cu^ at about 

 two-fifths the length of the cell. In one wing of the type, R^ is a 

 short distance from the tip of R^ ; in this same wing there is an adven- 

 titious cross vein in cell R^ just before midlength of i?2+3- 



Abdomen dark brown, sparsely gray pruinose; hypopygium rather 

 large, dark colored. 



Described from tv/o m.ales collected at Longmire Springs, Mt. 

 Rainier, Washington, June, 1917 (H. G. Dyar). 



Type.—lAfilQ, Cat. No. 26094, U.S.N.M. 



The nearest ally of Tricyphona rainieria in America is apparently 

 T. auripennis (Osten Sacken) of Northeastern North America. 



RHAPHroOLABIS (RHAPHIDOLABIS) STIGMA, new species. 



General coloration brownish black, gray pruinose, the praescutum 

 with three brownish black stripes; antennae with 12, 13, or 14 seg- 

 ments, the number remarkably variable, the flagellar segments short- 

 cylindrical, crowded; wings faint brownish gray; stigma conspicuous, 

 dark brown; Rs angulated at origin; cell Rg sessile; cell M^ present; 

 cell 1st J/j open. 



3Iale. — Length, 6.5 mm.; wing, 8.5-8.8 mm. 



Female. — Length, 6.6 mm.; wing, 9.5 mm. 



Rostrum and palpi dark brown. Antennae short in both sexes, 

 the number of segments variable, ranging from 12 to 14; antennae 



