71 MANDIBULATA. — COLEOPTERA. 



The insects of this genus may be known from those of the pre- 

 ceding genera of this family, by having the lateral margins of the 

 thorax more or less denticulated, and by the slightly different struc- 

 ture of the antenna?. 



A. With the lateral margins of the thorax rather strongly denticulated. 



Sp. 1. Populi. Oblongo-ovatus, fusco-ferrugineus, fmbescens, elytrorum disco 



nigricante, thoracis lateribus obtuse bidentatis. (Long. corp. l| — 2 lin.) 

 Cr. Populi. Pay kul— Curtis, iv.pl. 160.— Stepk. Catal. 85. No. 922. 



Oblong-ovate, ferruginous-brown, thickly punctate, pubescent; head porrect, 

 rather deeply punctate : eyes globose, black: thorax truncate anteriorly and 

 posteriorly, the disc convex, much punctured and pubescent ; the lateral 

 margins with a minute denticulation ; the anterior angles and base slightly 

 produced, the hinder angle being very acute : elytra ovate, piceous, minutely 

 punctured, the margin ferruginous or pale castaneous, pubescence ochraceous: 

 body beneath and legs pale ferruginous : antennae fuscous, with the club some- 

 what ferruginous. 



It varies considerably in colour ; some examples being without the piceous or 

 fuscous hue : probably immature. 



Not a common insect : taken sometimes, however, in considerable 

 plenty in old poplars and willows. In July, 1822, I found several 

 specimens in an old felled willow in Walsham-meadows, near 

 Ripley. The insect has been taken near Norwich. 



Sp. 2. bituberculatus. Oblongo-ovatus, rufo-ferrugineus, nitidiusculus , thoracis 

 lateribus bidenticulatis, disco punctis duabus elevatis. (Long. corp. 1 — 1^ lin.) 

 Cr. bituberculatus. Kirby MSS.—Steph. Catal. 85. No. 923. 



Oblong-ovate; rufo-ferruginous, rather glossy, pubescent, thickly and coarsely 

 punctulated : thorax with the anterior angle produced laterally into an ob- 

 solete prominent tooth or hook, and about the middle of the margin furnished 

 with a minute denticulation : its disc with two distinct elevated smooth tu- 

 bercular dots : antennae rather stout. 



The two elevated tubercles on the disc of the thorax, and the coarsely punctate 

 upper surface of this species, combined with its light hue, serve to discriminate 

 it from its congeners. 



Not uncommon in fungi, &c. throughout the metropolitan 

 district; and in other parts of the country. " North Wales and 

 Netley."— Rev. F. W. Hope. 



Sp. 3. humerahs. Oblongo-ovatus, subconvexus, piceo-ferrugineus, panct'ulatus, 

 elytrorum basi pallide testaceo, antennis pedibuscpic pallido-testaceus. (Long, 

 corp. 1 — 1| lin.) 



Cr. humeralis. Steph. Catal. 85. No. 924. 



