AMERICAN PHILOSOPHICAL SOCIETY. 421 



pair shortest; coxae of the four anterior ones conic-ovate, of tlie 

 posterior pair minute and concealed ; trochanters of the two an- 

 terior pairs subtriangular, of the posterior ones large, reniform 

 and prominent ; thighs nearly equal to the tibias, two anterior 

 j)airs, a little dilated near the base and attenuated towards the 

 tip, hind pair linear ; tibiae slender, lineai", not emarginate with- 

 in, heel armed with two spines ; tarsi five-articulate, filiform, 

 longer than the tibiae, joints cylindrical, first joint longest, second, 

 third and fourth gradually decreasing in length, the latter not 

 bilobate, terminal joint as long as the third and furnished with 

 two simple, incurved, acute nails; first, second and third joints 

 of the anterior pairs in the male dilated, hairy beneath. 



Ahdomcn. — Subcordate or subtriangular, of six distinct seg- 

 ments, five in the female ; terguni concave on the disk, with an 

 elevated margin ; venter convex, first segment divided into two re- 

 mote, almost triangular portions, forming the anterior lateral angles, 

 second segment with two deep, rounded sinuses near the middle 

 for the reception of the third pair of coxae, separated by a sub- 

 triangular, obtuse portion of the segment ; third, fourth and fifth 

 subequal, conspicuously falcate behind at the margin, rather di- 

 minishing in size, the last more rapidly narrowed in the male, 

 the sixth segment with an obtuse sinus at the middle tip ; tail 

 convex above, truncate beneath, with a deeply indented line near 

 the tip in the female. 



Larva. — Body soft, cylindrical, elongated, whitish, with a 

 double, erect, dorsal spine on the eighth segment; [409] head 

 coriaceous, colored, depressed and concave above, beneath con- 

 vex, much broader than the body, rounded, furnished with 

 strong, prominent Tnandibles, short antennae and two stemmata 

 on each side ; first, second and third segments, each furnished 

 beneath with a pair of scaly feet, the former with a coriaceous 

 disk ; tail simple. 



Food. — Insects, worms, &c, in the different stages of their ex- 

 istence. 



Season. — Spring, summer, autumn. 



Color. — Green, purplish or black, often varied with the two for- 

 mer, and exhibiting brilliant metallic tints, the elytra usuall}' 

 with abbreviated bands, lunules, and spots of white or yellow. 

 1818.] 



