269 



3. P. marg-inatuS; BoneUi, Obs. Ent., 2d, 45 ; St. Farg. et Serv. Enc. Mt'-tli.. 



X. 16, pi. CLXXXL, 18; Dej. Sp. Geu., I., 407; 

 Laporte Hist. Ins. 1., 63; Lee. Ann. Ljc, X. Y., 

 IV., 151, pi. VIII., f. 4 ; Putzeys, Prem. Ent., 8. 

 Semites marginatus, Fabr. Ent. Syst., I., 94 ; Syst. EL, I., 123 ; Oliv, 

 No. 36, 5, pi. II., 1 20 ; Beauvois, lOG, pi. XV., f . 1 , 

 2 ; Latr. Hist. Crust, and Ins., VIII., 376. 



South Carolina; southward, not uncommon. 



4. P. subsulcatus, Say, Trans. Am. Phil. Soc, II., 19; Ed. Lee, II., 449; 



Dej. Sp. Gen., 11., 471 ; Dej. and Boisd. Icon. Col. 

 Eur., I., 207, pi. XXII., f. 2 ; Lee. Ann. Lye., X. Y., 

 IV., 150, pi. VIIL, 1 3. 



Georgia and Florida, rare. Of the same form as P. marginatus, 

 but much smaller, with the sides of the prothorax less widely mar- 

 gined, and the hind angles rectangular and slightly prominent. 



III. DEPRESSUS Group. 



In this group, though in some of the species the relative propor- 

 tions of the body have not changed, the general form is more slen- 

 der, from the prothorax being more gradually and more strongly 

 narrowed behind; the hind angles are always rectangular and 

 prominent. ^ The lab rum varies in form, being broadly and fee- 

 bly trilobed {dejjressus), or distinctly so, with the middle lobe 

 narrower {caUfornicus, etc.) ; the mandibles are feebly rugose, or 

 nearly smooth; the mentuni tooth is usually deeply concave, and 

 appears almost emarginate. The 2-4 joints of the antennae are 

 sometimes feebly compressed {mexicanus), but in the others strongly 

 so, and subcarinate. The elytra are broadly rounded on the sides, 

 obliquely narrowed behind; they are usually smooth, but in two 

 species {obsoletns and clupUcatus) are more or less sulcate towards 

 the sides; in this case the humeral carina is continued into a ridge, 

 otherwise it is abruptly terminated and differs in length in the dif- 

 ferent species. The spine of the middle tibiae is slender and acute, 

 the hind tarsi are longer and more slender in depressus than in the 

 others. The species may be thus tabulated : 



