NORTH AMERICAN COLEOPTERA. 99 



Wo have two species whicli may be distinguished as follows : 



Elytra of mule angled posteriorly; head and prothorax paler in color than 

 elytra I. dnbius. 



Elytra male and female evenly rounded heliind : lioad and prothorax of same 

 color as elytra 2. dcbili^. 



1. B. (Iiihins Fab.— Form moderately elongated, very depressed. Surface 

 pmutatc, )iinicinr('s very large, and so close as to be almost confluent; elytra punc- 

 tato-slriate, covered with very short, stout and sparse, cinereous setae, which on the 

 eh'tra are arranged in rows. Color brownish black; head, prothorax, legs and 

 antennae paler. Head sub-quadrate, tri-lobed by two grooves, which extend 

 almost to the posterior margin. Prothorax wider than head, broader than long, 

 narrowed posteriorly; sides minutely serrate, sinuate; anterior angles very promi- 

 nent and toothed, posterior angles rounded broadly. Elytra broader than protho- 

 rax, more than twice as long as head afid prothorax together, entire; angled with- 

 out, posteriorly %, evenly rounded behind J; strongly bordered ; sides parallel 

 and straight; inflexed sides broad and well developed. Antennae filiform, as long 

 as the entire body, first joint slightly longer than the head, narrow and almost 

 straight, second very small, third to eleventh sub-equal and more elongated, last, 

 joint narrower and somewhat rounded at the tip ; all densely pubescent. Scutellum 

 angulated slightly behind. The male has two very arcuate horn-like processes on 

 the mandibles which the female does not possess. Length 4.8 — 5.8 mm. 



Plate VIII, Fig. 3. Southern States. 



Var. truncatu.i Mots. — Differs from the preceding in its smaller size. The an- 

 tennae are somewhat shorter, and the sides of the prothorax are straisrhter. there 

 being hardly any perceptible sinuosity behind the anterior tooth. 

 Length 4.2 — ,').() mm. 



Plate VIIL Fig. '^r. Calilnniia. 



2. B. debiiis Lee— Form elongate, depressed. Punctures of head and pro- 

 thora.x veiy large, deep, irregular and appro.ximate. in some spots confluent; ely- 

 tra punctato-striate and costate. Surface clothed with very short, robust and 

 sparse, yellowish setae, arranged in rows upon the elytra; color deep black; an- 

 tennae and mouth parts paler; abdominal segments somewhat paler and pubes- 

 cent. Head sub-quadrate, longitudinal grooves not reaching the posterior border. 

 Prothorax wider than head, broader than long, narrowed behind ; sides minutely 

 serrate, sinuate; anterior angles very prominent and toothed, posterior angles 

 rounded. Scutellum evenly rounded behind. Elytra two and one-half times the 

 length of the head and prothorax together, slightly wider than the latter, entire, 

 and evenly rounded behind in both sexes, broadly margined; inflexed sides well 

 developed ; sides parallel and slightly arcuate. Antennae as long as the elvtra and 

 prothorax together, filiform, first joint much longer than the head, sinuate and 

 bivjader toward the tip, second very small, third to eleventh sub-equal and elon- 

 gated, last joint longer and almost imperceptibly narrower, acute at tip; all densely 

 pubescent. Length 4.2 — 5.3 mm. 



Plate Vni, Fig. 5. North Eastern I'nited States. 

 This is the eoniiuon Northern species, whik' dn/u'iis is uim-f plciitiCiil at 

 the Sniitli. They are ((iiite distinct. 



