240 EDWARD NORTON. 



The abdomen is of nearly equal width from base to beyond the middle. 

 Var. CiNCTULUs. 

 9 . Abdomen black, with a rufous band on the third, fourth and 

 fifth segments. Massachusetts. Two $ . 



Var. Tardus. ' 



$ % . — Resembles, T. atrovlolaceus in form and marks, except that 

 the abdomen is rufous or honey-yellow. The males have no inner 

 under-wing cells ; outer cells as above. New England ; Illinois. 



34. Tenthredo attractus, n. sp. 



Black; mouth and apex of abdomen rufous; wings clouded violaceus. 

 Length 0.56. Br. wings 1.10 inch. 



9. — Black; body very large and stout; antennae moderate, not 

 greatly flattened, third joint long ; head as wide as thorax, large; nasus 

 emarginate and witb the labrura, base of mandibles and palpi, waxen- 

 yellow; thorax closely punctured; punctures on the pleura not coarse; 

 the five apical segments of abdomen ferruginous, abdomen long, wi- 

 dened beyond middle; legs black; the anterior tibiae and tarsi pale be- 

 fore ; wings clouded violaceous, the apical third least obscure, stigma 

 and costa black, base of stigma pale. 



English River. (Smiths. Inst.) 



One female. This large species resembles T. atrovlolaceus var. tar- 

 dus in form, but the wings are less obscure, the mouth is pale and the 

 abdomen is more slender and the punctures on head and pleura much 

 finer. 



.'!5. T. semiluteus. 



Tcnfhrcdo semiluteus, Norton, Bost. Proc. ix. 1862, 121. 9 'S • 

 Greenish-white and rufous, with the vertex and thorax above, black. Length 

 0.24—30. Br. wings 0.50—65 inch. 



9 . — Body not very long or large, antennae two-thirds the length of 

 body, slender, luteous, the two basal joints and a narrow line above, 

 black ; head greenish-white ; a large black spot on vertex extending 

 down between antennas; clypeus somewhat rounded before; mouth 

 white; apical joints of palpi black ; thorax black ; tegula), all the edges 

 of anterior angle, a spot on each side lobe of mesothorax, scutel, pleura 

 and pectus pale yellow; an irregular spot on pleura, and the disk of 

 basal plates, black; abdomen and legs honey-yellow; coxte and base of 

 femora, white; posterior femora blackish above; inner spur of ante- 

 rior tibiie obtuse, widely bifid; inner claw tooth larger than outer; 

 wings hyaline; apical half of stigma and the costa luteous; marginal 

 cross nervure bent and received in middle of third submarginal cell ; 

 underwings without middle cell. (One specimen with one inner cell 

 in one underwing). 



