AMERICAN PUILOSOnilCAL SOCIETY. 421 



pair shortest; coxa) of the four anterior ones conic-ovate, of the 

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

 terior pairs subtriangular, of tlie posterior ones large, reniform 

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

 pairs, a little dilated near the base and attenuated towards the 

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

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

 longer than the tibia;, joints cylindrical, first joint longest, second, 

 third and fourth gradually dccrea.sing in length, the latter not 

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

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

 t'f the anterior pairs in the male dilated, hairy beneath. 



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

 ments, five in the female; tergum 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 

 >ul)e(jual, 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 deepl}- indented line near 

 the tip in the female. 



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

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

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

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

 ?<trong, prominent mandibles, sliort antennae and two stemmata 

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

 beneath with a pair of scaly ic^it, the former with a coriaceous 

 disk ; tail simple. 



Fuud. — Insects, worms, k<!, 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 usually 

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

 1818.] 



