194 THE CANADIAN ENTOMOLOGIST. 



13 (12) Abdomen black. 



14 (21) Tegulce and collar black. 



15 (16) Legs black scelestus, Cress. 



16 (15) Legs partly white. '■• 



17 (18) Third joint of antennae much longer than fourth, .atratiis, n. sp. 



18 (17) Third joint of antennae about equal to fourth. 



19 (20) Wings pale fuliginous, irridescent nigrelhis, Cress. 



20 (19) Wings hyaline, faintly clouded at base ? tiii^, Nort. 



21 (14) Tegulse and collar pale. 



22 (27) Larger species, length about .25 inch. 



23 (24) Legs below trochanters reddish white, base of 



femora darker medius, Nort. 



24 (25) Knees, anterior tibiae above, and base more 



or less of the two posterior pair white irrogatus, Cress, 



25 (26) Knees, tibiae, except tips, and four anterior 



tarsi except apex, white atracornus, MacG. 



26 (23) Knees, tibife, except tips of posterior, and four 



anterior tarsi, white $ tilice, Nort. 



27 (22) Smaller species, length. 18 inch ; knees, tibiae 



and base of tarsi white .parens, Cress. 



TeNTHREDO MELANOSOMA, 71. sp. 



Female — Length, 12 mm.; black, mouth-parts and anterior legs touched 

 with white. Head large, front deeply channeled at each side of ocelli, and 

 slightly roughened, face below antennte polished; antennae rather slender, 

 third joint one-quarter longer than fourth (terminal five joints are want- 

 ing); clypeus emarginate, with a quadrangular white spot on each side, 

 labrum, base of mandibles and palpi also white. Thorax opaque, with- 

 out distinct punctuation ; anterior legs with a line on apex of femora, a 

 line on the tibiae, and the tarsi largely, yellowish-white ; a yellowish-white 

 line also on intermediate tibiae within; intermediate tarsi and apical 

 joint of posterior piceous; wings hyaline, slightly infumated beyond 

 middle; abdomen entirely black. 



Described from one specimen received from Mr. Wickham, taken by 

 him at Fort Wrangel, Alaska. It seems to be quite distinct from any of 

 the described American species. 



