AMERICAN HYMENOPTERA. 235 



Cape Mendocino, California. (Cambr. Mus. Coll. by A. Agassiz, 

 Jr.) One Female. 



19. Tenthredo varians, n. sp. 



Black ; mouth, cheeks, a spot above posterior coxfe and on pectus, white ,• a 

 band on abdomen and the femora rufous. Length 0.44. Br. wings o.84 inch. 



% . — Black ; antennae moderate; mouth, a spot on cheeks, edges of 

 tegulaj and collar, a spot above posterior coxa? and on the breast, white ; 

 the second, third and fourth segments of tergum and five basal seg- 

 ments of venter rufous; legs rufous, the anterior coxae and all the tro- 

 chanters whitish ; apical half of posterior tibiae and their tarsi black ; 

 wings hyaline, nervures black. 



Canada. (Coll. Am. Ent. Soc.) One male. 



20. T. semirufus. 



Tenthredo semirufus, Norton, Proc. Ent. Soc. Phil. Ill, 1864, 12, 2.3. J. 

 Black; mouth, cheeks and collar, white; apical half of abdomen rufous; 

 wings hyaline. Length 0.46. Br. wings 0.92 inch. 



9 . — Black; antennae not reaching beyond third segment of abdo- 

 men ; joints swelled at tips, the third one half longer than fourth ; la- 

 brum rounded; clypeus, labrum, base of mandibles, collar, and a dot 

 above posterior coxae white ; a spot on the third segment above and 

 the five apical segments of abdomen rufous ; legs black, with the ante- 

 rior pair below the coxae white beneath ; the femora of medial pair 

 and the tibias and tarsi of hinder pair reddish, paler on the tarsi ; api- 

 cal joints of all the tarsi pale; hinder spurs long, blunt, wings slightly 

 clouded, nervures, stigma and costa blackish. 



Var. a. 9 . — Collar, and fourth segment of abdomen black; poste- 

 rior femora rufous before and also the basal half of their tibiae rufous 

 above ; costa in both pair of wings and some of the basal nerves red- 

 dish. 



Rocky Mountains, Colorado. (Coll. Am. Ent. Soc.) Two specimens. 



21. Tenthredo discrepans, n. sp. 



Black; mouth, spot on cheeks, tegulce, collar, spot above coxas and on pectus 

 white, abdomen banded with rufous. Length 0.48. Br. wings 0.96 inch. 



% . — Black, (antennae wanting), the nasus, labrum, base of mandi- 

 bles, palpi, an oval spot on cheeks touching eyes, tegulae, collar, dot 

 above posterior coxae and spot on breast, yellow-white ; the first, sec- 

 ond and third segments of tergum and four basal segments of venter 

 rufous ; legs black; all the coxae beneath, the anterior legs before and 

 most of medial pair before, yellow-white; wings smoky hyaline, stigma 

 and costa black. 



English Eiver, H. B. T. (Smiths. Inst.) One male. 



