THE CANADIAN ENTOMOLOGIST. 207 



AA. Sutural region not grooved, elytra with a more or less distinct M- 

 shaped black mark behind the middle of each. 



Base of elytra irregular, an oblong obtuse umbone at middle of 



base. .42.-48 in decij>ietis, Hald. 



Base of elytra regularly convex without umbone. .80 



in Aforrisii, Uhler. 



The recorded food-plants of A. qiiadrigibbiis arc oak, hickory, 

 beech, and hackberry. I have found A. decipiens on oak logs, but am 

 unaware of the larval habits. 



Leptostylus, Leg. 

 Numerous species are known from Canada, and are arranged mainly 

 on the plan offered by Dr. Horn. The name co?nmixtus is replaced by 

 sexguitatus. The lateral tubercle of the prothorax is always blunt, 

 sometimes obsolete. 

 A Elytra without asperities and scalelike hairs. 



Prosternum between the coxae as wide as a coxal cavity, elytra 

 slightly truncate at tip. Robust, convex, prothorax with whitish 

 pubescence forming a broad lateral stripe each side, bounded 

 internally by a black stripe which is formed of a row of denuded 

 tubercles, the discal area brownish. Elytra with a broad 

 irregular transverse post-median area of whitish pubescence. 



. 16-.36 in macula, Say. 



Prosternum narrower than a coxal cavity, tips of elytra separately 

 rounded, thorax moderately densely punctured on flanks as well 

 as disk. Yellowish or reddish brown, elytral surface uneven, 

 basal angles black, polished ; a dark brown irregular band often 

 extends backward from these angles to the middle, thence 

 narrows towards suture, followed posteriorly by one or two 

 black spots, but these markings may be absent. Three large 

 basal tubercles on prothorax, and three smaller, sometimes 



obsolete, subapical ones. .40 in collaris, Hald. 



AA. Elytra with asperities or tubercles, bearing at their summits short 

 black scalelike hairs, 

 b. Thorax densely punctured, elytra with densely placed coarse 

 deep punctures. Colour variable, elytra mottled with grayish 



pubescence. .28-. 40 in sexguitatus, Say. 



bb. Thorax not densely punctured, elytral punctures not closely 

 placed, often inconspicuous or concealed. Legs not hairy. 



