156 



THE CANADIAN ENTOMOLOGIST. 



AAA, Elytra plain. Colour testaceous or slightly brownish ; prothorax 

 densely rugosely punctured. .12-. 1 6 in , . . . . Schreibersi, Suffr. 

 It should be remarked that nearly all of these are very variable in 

 colour, but the table covers all of the recorded named varieties for East 

 Canada. Any specimens which appear not to come under any of the 

 names given should be referred to specialists. 



Pachybrachys, Chevr, 

 Contains a number of small species in which the outer striae of the 

 elytra are usually completely confused and the inner ones tortuous and 

 irregular. They have been tabulated by Dr. Leconte, in the paper cited, 

 and in this as well as the preceding table we have drawn upon his work 

 for many characters. 



A. Colours of upper surface definitely arranged, 

 b'. Striped yellow and black or brown. 



Suture broadly black, each elytron with two broad 

 stripes and narrow margin black. Thorax with M- 

 like brown mark. .10-14 \n. . . .litigiosus, Suffr. 



Suture very narrowly black, each elytron with a 

 broad oblique stripe, narrow outer margin and an 

 intervening row of spots black. Thorax either en- 

 tirely yellow, ferruginous, or yellow with ferru- 

 ginous, M-like mark. .14-22 in. 



(Fig. 16) viduatus, Fabr, 



tr. Opaque black, prothorax with sides, front margin, anterior 

 portion of median line and two basal spots, red. This red 

 maybe variously reduced. .•i6-. 20 \n. .trhiotatus, Me\%\\. 

 bl Yellow above, head with black spot on crown, prothorax 

 with a black spot on each side, and a somewhat Y-shaped 

 one at middle. Elytra with humeral spot and a large V on 

 suture, which joins at its apex with an irregularly indented 

 transverse subapical band, black or brown. These markings 

 may become indistinct at times. .06-. 1 2 m...tridens, Melsh. 



AA. Uniform opaque black. .10-14 in carbonarius, Hald. 



AAA. Colours more or less mottled. 



c. Sides of prothorax strongly rounded and incurved near base ; 

 hind angles rounded. 



1 



Fig. 16. 



