250 THE CANADIAN ENTOMOLOGIST. 



A. Elytra broadly rufous at base, head and thorax rufous, varying 

 rarely to blackish. Elytra with transverse black and cinereous 



bands. .20-.28 in . . quadriguttatus, Oliv. 



AA. Elytra at base black or only narrowly rufous. 



Thorax and head rufous ; elytra with basal or sub- 

 basal, postmedian and apical band black, sub- 

 apical band cinereous. .42 in. 



(fig. 18) ichne2i?noneus,¥3.hv. 



Thorax rufous, with a large baso-median black spot ; 

 head and elytra black. .20-. 2 7 



in ihoracicus, Oliv. 



Thorax, head and elytra black ; the last with three 



cinereous bands, of which the posterior is widest, ^'s- '^• 



and apical orsubapical in position. .27-35 m.jiigriventris, Lee. 



Near the Pacific Coast we find also C. sphegeus, Fabr., which is 



about the colour above of C. ?iig?-ivetitris, but larger (.34 in.), and the 



abdomen is red, while the elytra have a very wide median and -small 



apical cinereous band. 



Thanasimus, Latr. 



The character given for the separation of this genus from Clerus is 

 not very evident, and most reliance must be placed on the specific de- 

 scriptions, which have been made moderately full. There is the same 

 tendency to colour-variation as in most other genera in this family. The 

 characters of the Canadian forms are as follows : — 

 Elytra rufous, with broad median band and tip black, intermediate band 



cinereous. Feet black. .39-51 in. tri/asciatus, Say. 



Elytra rufous at base, dark posteriorly with two cinereous or whitish 



fasciae ; beneath rufous. .34 in djibius, Fabr. 



Elytra black, very narrowly rufous at base, with two cinereous bands, of 

 which the anterior is shaped like a w and narrower than the posterior, 

 which is not undulated ; thorax reddish, anterior margin piceous, 



post-pectus black at middle. .20-.30 in u?idatulus. Say. 



Elytra black with two undulate cinereous fasciae, the posterior broader ; 

 thorax black, abdomen and feet rufous. .30-38 in. .nubilus, Klug. 

 Elytra black, the suture anteriorly cinereous, and two bands of the same 

 colour; the posterior broader, outer row of punctures extending beyond 

 the middle ; abdomen sanguineous, thorax and legs 

 black. .30 in rubrivejitris, Lee. 



