126 GEORGE H. HORN, M. D. 



some with and without the clypeus angulate on each side of the emar- 

 gination. Two species only have the niesosternum carinulate. 



The following table will serve to distinguish the species. 

 Anterior tibise strongly tridentate. 



Mesosternum distinctly carinulate between the cox£e. 

 Clypeus broadly rounded at each side. 



Hind tibiae stout; strice of elytra nearly without punc- 

 tures , rubeolus. 



Hind tibiae slender; striae distinctly punctured stercorosus. 



Clypeus bidenticulate militaris. 



Mesosternurn not carinulate; flat or concave between the coxae. 

 Thorax red or yellowish-testaceous, never black. 

 Small species, .16 — .22 inch. 

 Clypeus distinctly angulate on each side of emargina- 

 tion, color uniform rufous ; hind tibiae stout ; striae 

 serrately punctured ; intersjiaces densely punctu- 



late rubiginosus. 



Clypeus rounded on each side of eniargination. 



Hind tibi£e stout. Color reddish, elytra paler, striae 



not or very faintly punctured segrotus. 



Hind tibiae slender. Color yellowish-testaceous, striae 



distinctly punctured consentaneus. 



Large species, .30 — .35 inch ; color ferruginous. 



Thorax not margined at base, very shining politus. 



Thorax distinctly margined at base. 



Disc of thorax coarsely punctured rubidus. 



Thorax punctured only at sides concavus. 



Thorax black. 



Surface with distinct aeneous lustre; tibiae slender subaeneus. 



Surface shining, without metallic lustre. 

 Clypeus feebly emarginate, broadly rounded on each side. 



Elytra with alternate interspaces yellow alternatus. 



Elytra ferruginous at tip terminalis. 



Clypeus distinctly angulate on each side of eniargination. 



Abdomen and legs piceous or black coloradensis. 



Abdomen and legs yellow bicolor. 



Clypeus truncate at middle and an acute tooth on each 



side dentiger. 



Anterior tibiae with the upper tooth nearly obsolete ; at tip 

 sub-truncate, inner edge sinuate; hind tibial stout," 

 Color pale yellowish-testoceous; mesosternum 

 fiat phalerioides. 



A. rubeolus, Beauv. Ins. Afr. et Am. p. 90, pi. 2, fig 4 ; copronymus, Mels. 

 Proc. Acad, ii, 1844, p. 136. — Elongate, pale ferruginous, shining. Head 

 sparsely and finely punctured, clypeus feebly emarginate at middle. Thorax 

 with disc smooth, coarsely punctured toward the sides. Elytra not deeply 

 striate, striae very feebly punctured interspaces fiat, smooth. Hind tibiae 

 stout, niesosternum distinctly carinate. Length .14 — 48 inch; 3.5 — 4.5 mm. 



Easily distinguishable from any of our species by the characters 



