146 THK CANADIAN ENTOMOLOGIST. 



a small spot above the posterior coxa 1 , yellowish-white. Legs (including 

 the coxae), except the apex of the posterior tibia and all of their tarsi, and 

 the abdomen, except the apical segment, clear rufous. Wings hyaline, 

 with a faint yellowish tinge ; venation brown. 



Type locality : Florissant, Colo. One female collected on the foliage 

 of Salix brachycarpa, July 7, 1907, by S A. Rohwer. 



This species is close to T. secilis, Cresson, but differs in having the 

 coxae and the trochanters rufous, the legs are not pale beneath, and the 

 tegulae are black. 



Tenthredo alpcstris, n. sp. — Male : Length, 7 mm. Clypeus 

 semicircularly emarginate, the lobes broad, rounded. Antennal frons 

 strong ; occiput margined ; lateral ocellar furrows strong ; interocellar 

 furrow wanting. Third antennal joint about as long as four plus five ; 

 the joints not spined beneath ; the apical joint equal with the preceding. 

 Anterior lobe of the mesonotum granular, dullish; the lateral lobes shining, 

 sparsely punctured. Scutellum with rather close, large punctures, and a 

 middle carina. Inner claw tooth stouter and a little shorter than the 

 outer. Stigma rounded beneath ; venation normal. Black, yellow and 

 rufous. Head below the antenna;, two small spots above each antenna, 

 inner orbits to the summit of the eyes, outer orbits to about the middle of 

 the eye, most of the prothorax, tegula?, anterior part of the scutellum, 

 mesopleura and pectus, two large spots above the posterior coxae, and a 

 spot on the basal plates, yellow. Abdomen beyond the basal plates clear 

 rufous. Legs : coxa? (a black line above on the posterior pair), 

 trochanters, except a black line above, four anterior femora, except a 

 black line above, anterior tibiae and tarsi, except a line above, 

 yellow ; the posterior legs below the coxae, except a line above on the 

 femora above at the base, and the intermediate legs below the femora, 

 rufous. Wings hyaline, iridescent ; venation brown. 



Type locality : Florissant, Colo. One male collected on foliage of 

 Salix brachycarpa, June 16, 1907, by S. A Rohwer. 



This species is perhaps closest to T. suavis, Cresson, but it is much 

 smaller, and the postscutellum and most of the scutellum is black, and 

 the abdomen is not " yellowish-white." It may be known from frigida, 

 Macg., by the eyes slightly converging below, the longer third antennal 

 joint, etc. 



