AMERICAN HYMENOPTERA. 233 



9. — Black; antennse moderate, joints somewhat globose, labrum 

 pointed; a minute dot at summit of eyes within, an oval dot above 

 base of each of antennre, face below, cheeks, tegulae, collar, a round 

 connected dot below, a longitudinal line on pleura, a spot above the an- 

 terior and posterior coxae, a spot on breast before intermediate legs, and 

 sides of basal plates, white ; abdomen rufous, with first second and third 

 segments above and beneath and the apex beneath black ; all the coxae 

 (except a black spot above) trochanters, anterior legs before and all 

 the patellfe, white ; anterior legs above and both the posterior pair 

 partly rufous, with a slender black line down all the femora and the 

 four anterior tibise ; apical half of wings smoky, nervures black, stigma 

 pale at base, costa rufous. 



S . — The male has the labrum not pointed but rounded before, a 

 slender white orbital line on the inner half of orbit, all of pleura ex- 

 cept a prolonged triangle beneath the wings and the breast, white; fe- 

 mora whitish beneath. 



Rocky Mountains, Colorado. (Coll. Am. Ent. Soc.) IS,!?. 



15. T. pleuralis. 



Tenthrcdo pleuralis, Cresson, Proc. Ent. Soc. Phil. iv. 1865, 245, 7. 

 "Black,- mouth, cheeks, margins of anterior angle, body beneath and most 

 of the legs, white; apical half of abdomen ferruginous. Length, 9 » ^i lines: 

 •^,,4^ lines. Br. wings, 9 , 11 lines; '^ , 9J lines. 



9. — Black; antenna) moderate, a small dot near summit of eyes 

 within, a dot above base of each of antennae, face below, lower half of 

 cheeks, tegulae, upper and lower margins of anterior angle, a broad 

 mark on pleura, most of breast, four posterior coxae and sides of basal 

 plates, white ; basal half of tergum black, apical half ferruginous ; ven- 

 ter white, reddish toward tip; legs whitish; femora and tibia3 behind, 

 especially at tips, black ; tarsi ochreous ; wings pale yellowish-hyaline, 

 nervures blackish yellowish at base as well as the costa and base of 

 stigma. 



% . — The male has the antennte a little longer ; pleura entirely 

 white; base of abdomen blackish, remaining segments honey-yellow; 

 apical ventral segments tinged with same color; wings faintly yellowish. 



Colorado. (Coll. Am. Ent. Soc). Great Slave Lake, (Smiths. 

 Inst. R. Kennicott.) 1^,19. 



16. T. variegatus. 



Tenthredo variegatus, Norton, Proc. Ent. Soc. Phil. iii. 1864, 12, 24, %, . 

 Black ; face, collar, tegulae, pleura, pectus and legs beneath, white ; apical 

 half of abdomen rufous. Length 0.36. Br. wings 0.76. inch 



% . — Black ; antennae not reaching beyond second segment of . 



