268 



2. P. sublaevis. 



Prothorax suddenly narrowed near tlie base ; liind angles obtuse, not prom- 

 inent ; elytra feebly sulcate, sometimes nearly smootli. 



Dej. Sp. Gen., 1,408. Bonelli, Obs. 2d, 4G; Lee. Ann. Lye. New 

 York, IV., 149, pi. VIII., f. 2 ; Putzeys, Premices 

 Entom., 9. 



var. P. rugosits, Lee. Ann. Lye, IV., 149, pi. VIII., f. 1. 



var. P. assimilis, Lee. ibid., 148, pi. VII., f. 8. 



var. P. substriatus, Hald. Proc. Acad. Nat. Sc., Phil., I., 313; Lee. 

 1. c, 147, pi. Vn., f . 6. 



Length, 21-28 m. m.; .83-1.1 inch; Xew York to Florida, and 

 westward to Illinois. 



This species varies in size and sculpture, and there is every inter- 

 mediate grade between the type, with well defined, though shallow 

 grooves, to the smooth and more shining suistriatus. These inter- 

 mediate forms were described by me as rugosus and assimilis, the 

 former being an individual variation, having the basal impressions 

 of the prothorax rugous. 



II. MARGINATUS Group. 



In this group the labrum is rather feebly lobed, the middle por- 

 tion broader than in the preceding; the mandibles are obliquely 

 rugose, but much more feebly than in the 1st group ; the mentum 

 tooth is rounded at tip, and somewhat concave. The joints 2-4 of 

 the antennae are not compressed. The prothorax is broadly rounded 

 on the sides, feebly narrowed behind, with the angles obtuse and 

 not prominent in marginatus, rectangular in suhsulcatus ; the side 

 margin is widely depressed in marginatus, and narrower in stihsnl- 

 catus. The elytra are less convex, feebly sulcate, with the alternate 

 intervals more elevated, the sides are slightly rounded, and they are 

 obliquely narrowed behind, and not broadly rounded as in Group 1 ; 

 the humeral carina fades gradually into an interspace. The spine 

 of the middle tibial is slender and acute, and the hind tarsi longer 

 and more slender. 



