92 GEO..H. HORN, M. D. 



punctures are very coarse and deep, sparsely placed. Elytra a little wider and 

 one-fourth longer than the thorax, the punctuation coarse and deep, substriately 

 arranged near the base, confused at apex. Abdomen coarsely but sparsely punc- 

 tured, the intermediate space very finely alutaceous. Legs yellowish testaceous. 

 Length .24-.2G inch : 6-6.5 mm. 



Male {Complete form).^Th\Td segment with a very short setigerous plica; fourth 

 segment with an almost obsolete fovea at middle, prolonged at middle posteriorly, 

 in a narrow triangular lobe attaining the sixth segment; last ventral entire. 



Male {Imperfect form). — Third ventral with a short setigerous plica, fourth not 

 lobed behind but with a small fovea at middle (PL 1, fig. 10). 



Female. — Ventral segments without fovea or plica, the terminal entire. 



The form of the head and its sparse punctuation will serve to distin- 

 guish this species from ^ny in the group in which it is placed. The only 

 other species with this form of head are of large size and different col- 

 oration. 



I have seen but four specimens ; the two males described are in Le- 

 Conte's cabinet, the females (pcn-cum Lee.) are one in each cabinet. 

 Florida. Hubbard and Schwarz. 



7. C. bicolor Grav. — Piceous, shining, thorax, elytra and last two ventral 

 segments rufo-testaceous. Antennae shorter than the head and thorax, rufo-testa- 

 ceous, third joint longer than the second. Head black, shining, coarsely not 

 densely punctured except at the sides, front smoother, form oblong-oval, very 

 rarelj-^ with the sides of the head slightly oblique. Thorax narrower than the 

 head, scarcely more than a fourth longer than wide, sides nearly parallel, median 

 smooth space well defined, close to which the punctuation is coarse and close, near 

 the base and at the sides much sparser. Elytra about one third wider than the 

 thorax and distinctly longer, the punctuation coarse and deep, close but not dense, 

 irregularly arranged. Abdomen sparsely and comparatively finely punctured. 

 Legs pale rufo-testaceous. Length .30-.40 inch; 7.5-10 mm. 



Male {Complete form). — Third ventral with a short, median, transverse, setiger- 

 ous plica; fourth segment prolonged posteriorly in a lobe with parallel sides and 

 rounded tip, passing the posterior margin of the fifth segment, at middle a fovea 

 of moderate size; last ventral entire (PI. 1, fig. 11). 



Male {Incomplete form). — Lobe of fourth ventral extremely short indicated 

 merely by the posterior margin being more arcuate at middle ; the plies of the 

 third segment as above, the fovea of the fourth larger than the complete form (PI. 

 1, fig. 12). 



Male {Imperfect form). — Plica and fovea as in the incomplete form ; fourth ven- 

 tral truncate behind without trace of lobe (PI. 1, fig. i;>). 



Female. — Third ventral at middle with a fovea of moderate size and rather 

 transverse (PI. 1. fig. 14). 



In color the species seems wonderfully constant, and immature speci- 

 mens, with the black head rendered thereby more conspicuous, have been 

 described as melanocephalum. 



Occurs from Michigan to Georgia and Texas, and as far west as Neb. 



8. C. carolinimi Er. — Piceous, moderately shining, thorax, elytra and last 

 two ventral segments rufo-piceous. Antennse a little shorter than the head and 



