THE CANADIAN ENTOMOLOGIST. 195 



Tenthredo nigrisoma, ;/. sp. 



Female— Length, 13-14 mm.; black with pale legs; head very large, 

 wider than thorax; frontal ridges well marked, antennae slender; dot at 

 inner summit of eye, clypeus, labrum and base of mandibles yellow, palpi 

 rufo-testaceous or*yellowish. Thorax opaque, roughened, especially the 

 scutellum; a yellow spot above posterior coxae; legs, except coxae and 

 dots on trochanters, entirely rufous in one specimen, and much paler in 

 the other which has the anterior pair, the middle femora and the pos- 

 terior tibiae almost yellow; wings yellowish-hyaline, stigma and nervures 

 black, except basal half of costa, which is rufous. Abdomen wide, flat- 

 tened, shining, entirely black. 



Described from two specimens from Victoria, V. I., received from Mr. 

 Taylor (dated 5th June, 18S8) and Mr. Wickham. Closely allied to 

 T. ?iigricosiata, Pro v., of which the type is in my possession, but is 

 larger, the sculpture of the scutellum is coarser, the clypeus and labrum 

 are yellow, the costa is in part rufous, and the posterior tarsi are uni- 

 colorous with legs. 



Tenthredo ruficollis, n. sp. 



Female — Length, 13 mm..; black, with red legs. Head not nearly so 

 large as in preceding species, and the frontal grooves very shallow ; an- 

 tennae rather short and stout ; clypeus, labrum and mandibles yellow, 

 palpi testaceous. Thorax uniformly, not coarsely, roughened ; tegulas 

 and a large quadrangular spot on collar bright rufous ; legs, except coxae, 

 rufous, the anterior pair a little paler ; wings hyaline, nervures piceous, 

 stigma and costa paler. Abdomen long, narrow, shining, entirely black. 



Described from one specimen received (through Mr. Fletcher) from 

 Mr. Bean and captured at Laggan, in the Rocky Mts., B. C. 



The described American species of Tenthredo are now so numerous 

 (over eighty) that it necessitates a great deal of labour to go over all the 

 descriptions. The males in some groups, such as signata, etc , are so 

 variable and resemble each other so greatly that they cannot in many in- 

 stances be satisfactorily separated by the present descriptions. The 

 three species which I have described have the abdomen entirely black, 

 and to assist in determining them I have prepared the following table of 

 the species having the abdomen black, and which seem to be twenty-one 

 in number. A table of the remaining species would be very desirable. 



