268 



2. P. sublaevis. 



Protliorax suddenl}- narrowed near the base ; hind angles obtuse, not prom- 

 inent ; elytra feebly sulcate, sometimes nearly smooth. 



Dej. Sp. Gen., 1,408. Bonelli, Obs. 2d, 46; Lee. Ann. Lye. New 

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

 Entom., 9. 

 var. P. rugosus, Lee. Ann. Lye, IV., 149, pi. VIIL, f. 1. 

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



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

 I. c., 147, pi. VII., 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 scnlptnre, and there is every inter- 

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

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

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

 former being an individual variation, having the basal impressions 

 of the protliorax 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 protliorax is broadly rounded 

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

 not prominent in marginatus, rectangular in snbsiilcatns j the side 

 margin is widely depressed in marginafns, and narrower in subsul- 

 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. 



