THE CA.NAt)IAN ENTOMOLOGIST. 



151 



A. Labrum nearly truncate at middle, apices of coxal 

 processes obtuse ; thorax with all the margins 



yellow. 1.60 in. (fig. 11.) Harrisii, Kirby. 



AA. Labrum distinctly emarginate at middle, 

 b. Coxal processes not spinose at apex. 



0, Thorax with sides yellow, base and apex not or only indis- 

 tinctly so. 

 d. Body beneath reddish, margins of ventral 

 segments and some other markings 



black. 1. 04-1. 2 5 in fasciventris. 



?av. 



dd. 



Body beneath blackish or piceous. 



Elytral pale margin broad to apex. 



1.08 in hybridus, Aube. 



Elytral pale margin narrowing to apex 

 and with oblique subapical fascia. 



1. 28-1. 35 in verticalis, Say. 



cc. Thorax with all the markings distinctly and usually rather 

 broadly yellow. 



Coxal processes blunt at tip. 1.20 'm...subli}nbatjis, Lee. 

 Coxal processes acuminate. 1.32 '\\:\...margmalis, Linn, 

 bb. Coxal processes spinose at apex. 



Entirely pale beneath except the middle 



of the metasternura. 1.28 in circuvicindus, Ahr. 



Under side with black markings on margins of 

 ventral segments and on metasternum. 

 1. 25-1.40 in dajiriais, Gebl. 



AciLius, Leach. 



The two known from Canada both have 

 females with sulcate elytra, though /rater?ijis 

 has also a smooth form. They separate with 

 difficulty, the main characters being these : — 



Fulvous above, head with base and an M- 

 like mark on the vertex black ; thorax with two 



transverse black lines, the anterior larger. 

 Elytra closely irrorated with black dots and 

 with subapical yellow fascia, posterior femora 

 slightly suffused with black at base. .50-56 in. 

 ^"^- "• (fig 12.) semisulcatus, k\x\)€. 



