36 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Female. — Length, 5 mm. ; wing, 7 mm. 



Rostrum and palpi dark brown. Antennae black throughout. Head dull 

 brownish gray. 



Mesonotal prsescutum brown with three broad dark brown stripes ; 

 tuberculate pits and pseudo-sutural fovea; black, the former located at the 

 level of the anterior ends of the latter; remainder of the mesonotum 

 brownish gray. Pleura dull gray ; two conspicuous tufts of long, light 

 yellow hairs on the meso-pleura, the more dorsal of these lying between 

 the bases of the wings and halteres. Halteres conspicuously light orange- 

 yellow. Legs with the coxse dull gray; remainder of the legs dark brown, 

 the femora clothed with sparse, pale, appressed hairs. Wings brownish 

 gray, the disk variegated with paler ; base of the wing, costal and sub- 

 costal cells more yellowish ; cell 2nd Ri beyond the stigma pale ; veins dark 

 brownish black. Venation: Sci ending opposite r; Sc2 far from the tip of 

 Sci, the distance on R between the origin of Rs and Sc2 being a little less 

 than Ri beyond r; r about equal to the section of R2 before it; cell 1st Mi 

 closed, long and narrow; basal deflection of Cui at about one-third the 

 length of cell 1st M2. Anal veins convergent, the 2nd anal vein being 

 sinuous on its outer end. 



Abdomen dark brown, the lateral margins with conspicuous light yellow 

 hairs. Ovipositor with the tergal valves strongly upcurved. 



Habitat. — Washington. 



Holotype, 5 (No. 719), Paradise Valley, Mt. Rainier, alti- 

 tude 5000-6000 feet, July 29, 1919 (C. L. Fox). 



Ormosia paradisea is allied to 0. arcuata (Doane) of the 

 Eastern United States, but the coloration is darker through- 

 out, Sc2 closer to the origin of Rs than to the tip of Sci, and 

 other characters. 



Genus Rhabdomastix Skuse 

 Subgenus Sacandaga Alexander 



The species discussed below is the fourth Nearctic form to 

 be described. It should be noted in passing that the two Euro- 

 pean species of Gonomyia, G. schisfacca (Schummel) and G. 

 l(Bta Loew, are in reality members of this genus and subgenus. 



2. Rhabdomastix (Sacandaga) fasciger, new species 



General coloration brown, the pleura gray; wings grayish, 

 the stigma brown ; an indistinct brown fascia along the cord ; 

 abdomen dark brown. 



Female. — Length, 7-8 mm. ; wing, 7.5-9 mm. 



Rostrum and palni dark brown. Antennse dark brown. Head gray, 

 more brownish medially. 



