NORTH AMERICAN COLEOPTERA. 169 



4. P. carnifex Linn. {Scarabaeus). Syst. Nat., ed. 12, 1767, v. I, pt. 2, p. 546: 

 Drury, 111. Exot. Ins. 1770, I, pi. 35, fig. 3-5; ed. Westwood, 1837, v. I, p. 72, pi 

 35, fig. 3-5; Fabr. Syst. Ent. 1775, p. 26; Spec. Ins. 1781, v. I, p. 29; Mant. Ins 

 1787, V. I. p. 15 ; Syst. El. 1801, v. I, p. 48 ; Oliv. Ent. 1789, v. I, p. 135, pi. 6, fig 

 46, pi. 10, fig. 86: Voet. Col. pi. 26, fig. 31, 32; Jabl., Col., v. II, pi. 15, figs. 4, 5 

 Beauv. Ins. p. 198, pi. 3, figs. 8, 9 ; MacLeay, Hor. Ent. 1819, I, p. 132; vindex 

 McLeay, 1. c. p. 133. 



Usually with the thorax bright cupreous and the elytra green. In 

 eastern specimens the intervals of the disc of the elytra are more or less 

 costate, but in the west specimens occur with the intervals flat and en- 

 tirely without costae, thus resembling the last. 



Length 12-22 mm. Atlantic States to Rocky Mts. 



5. P. triangularis Say {Copris), Jour. Acad. 1823, series I, v. Ill, p. 206; 

 ed. Lee. II, p. 132; Lee. Jour. Acad. 1847, series II, v. I, p. 85: torrens Lee. (va- 

 riety), 1. e. ; Proc. Acad. 1854, v. VII, p. 217; eudoxus Dej. Cat. ed. 3, p. 155. 



Eudoxus has been used as a cabinet name for a var. of the next 



species. Opaque, black, dull cupreous, or greenish. 



Length 16-21 mm. Mo., Kans., Texas. 



6. P. igneus McLeay, Hor. Ent. 1819, v. I, p. 133; nigrocyaneus M.c'Lea,j \. 

 litt. : tityrus Dej., Cat. 1836, ed. 3, p. 155 : scabripennis Sturm, Cat. 1843, p. 106. 



Moderately shining, entirely black, thorax green and elytra black, or 



thorax green or more or less cupreous and elytra green. 



Length 16-20 mm. Gra., Fla. 



7. P. mexicaiius Harold, Ann. Soc. Ent. Fr. 1863, series IV, v. Ill, p. 171 ; 

 mexicanus Klug. Dej. Cat. ed. 3, p. 155. 



Shining green or cupreous. The male when well developed is said to 

 difl'er from allied Mex. species by having in the middle of the subconvex 

 disc of the thorax a bituberculate transverse carina anterior to which 

 and nearer to it than to the apical margin is a small tubercle, the position 

 of which as indicated is peculiar to this species. On the hind part of 

 the declivity are two prominent arcuate teeth with the apices more or less 

 produced forward. 



Length 19-24 mm. Ariz., Mex. 



Miscellaneous Notes. 



Platycerus Agassii Lee. — The two sexes of this species differ far 

 less than is usual in the genus. There is no notable difference in the 

 form of the head nor in the mandibles. The antennal club is purely 

 3-jointed in both sexes, much broader in the male, and one and a half 

 times the length of the preceding six joints of the funiculus. In the 

 female the club is barely longer than the funiculus. In form the female 



TRANS. AMER. p:NI . SOC. XII. (26j MAY, 1885. 



