Head feebly convex, gnla not transversely impressed, genie more or less in- 

 cised. Basal joint of antennae normally slender. 

 Anterior tarsi of male with three joints papillose beneath, the fourth also 

 with a few papilla.-. 

 Thorax much wider than long, strongly constricted posteriorly, disc 



of elytra not much convex 12. cordatUS. 



Thorax cordate, not wider than long, elytra with convex disc. 



Sides of thorax posteriorly oblique witli scarcely a trace of sinu- 

 ation, elytra cupreous with greenish or golden margin, 



13. margiiialus. 

 Sides of thorax distinctly sinuate, hind angles rectangular, elytra 



slightly purplish 14. dissolutus. 



Anterior tarsi of male with the first three joints papillose beneath, the 

 fourth without papillae. 



Elytral striae not exceeding 14 in number 15. interrupt u*. 



Blytral strias 16-18 in number. 



Sides of thorax posteriorly oblique 16. obliquus. 



Sides of thorax posteriorly sinuate. 



Elytra striate punctures rather fine. 



Thorax usually longer than wide, feebly sinuate pos- 

 teriorly, margin very narrow and very feebly or 

 not at all reflexed, elytral strife scarcely at all 



confused at the sides 17. striatll§. 



Thorax wider than long, sides posteriorly deeply sinu- 

 ate, margin wider and distinctly reflexed, outer 

 three or four elytral striae much confused behind 



the middle 1§ ventricosus. 



Elytra with extremely fine striae, punctures large 19. mini us. 

 Anterior tarsi of male with the first two joints only papillose. 



Thorax posteriorly slightly sinuate, not constricted, surface sub- 

 opaque, elytra ovate. 

 Elytra finely striate, stria? with rather coarse deep punctures, 



2©. punctatu§. 

 Elytra without stri;c, but with rows of rather fine punctures, 



21. subtili§. 

 Thorax posteriorly constricted, sides posteriorly deeply sinuate, sur- 

 face moderatelj' shining, elytra longer oval. 

 Elytra finely striate, striae finely punctured, the alternate inter- 

 vals behind the middle with a row of punctures, 



22. striatopuiielatiis. 

 CYCHRIJS, Fab. 



Front flattened, sides of thorax sinuate posteriorly, elytra with series of tuber- 

 cles 23. tuberculatum. 



Front transversely convex, sides of thorax oblique, elytra rugulose with traces 



of tubercles at declivity 24. Hempllillii. 



Front carinate. thorax angulate at middle, base slightly prolonged, hind angles 



rectangular, elytra finely punctato-striate 25. siii^nlaluo. 



BIBLIOGRAPHY. 



1. nitidicollis, Chevr. Guer. Icon., p. 24, t. 7, f. 1, a-c;=niagarensis. Cast. Ann. Fr.. 

 1832. p. 390 :=Schaumi. did. Bull. Mosc, II. 499 ; granulosus, Chd.. 1. c. pag. 

 497. palpalis, Mots. Bull. Mosc. 1865. IV. 312. Length, 12-16 mm. Hud- 

 son Bay region to Northern Virginia 



var. Brevoorti, Lee. Ann. Lye, IV. 443, has the elytra at base deeply stri- 

 ate, while the var. nitidicollis. Chevr. has the elytral striae almost entirely 

 wanting. Occurs in Maine. 



