AMERICAN COLEOPTERA. 183 



ing joints, and as long as 2-7 united ; ninth similar to eighth ; tenth obviously 

 longer than the ninth, linear, pointed. In the female the eighth joint is less 

 parallel and equal to 3-7 united. The eves are only slightly larger in the male. 

 Length 3.4-6.8 mm. 



This species is common and widely diffused in the northern and 

 eastern portion of the United States and Canada. The material 

 before me covers the region extending from New Hampshire to 

 North Carolina (Black Mountains, Van Dyke) and west to Iowa 

 and Missouri. Say's type was said to have been "found on the 

 Mississippi above the mouth of the Ohio." 



There is much variation in size, depth of color, and distinctness 

 of the apical sinuation at the sides of the prothorax, but apparently 

 little in other respects. The larger specimens— usually females — 

 are most frequently darker in color, and it is in these that the post- 

 apical sinuation often disappears, and the angles become in conse- 

 quence less sharply outlined. The sinuation is nearly always evi- 

 dent in the smaller specimens, but there is every possible intermedi- 

 ate form in the series at hand, and in more than one specimen the 

 sinuation is present on one side and not on the other. I am there- 

 fore compelled to unite errans Melsh. with carinatus, there being no 

 other character given in the books for their separation. 



3. H. linearis Lee. — Blackish brown, size of average carinatus and other- 

 wise very similar, except that the sides of the prothorax are straight and parallel 

 for more than two-thirds their length, and the disk is more strongly gibbous. 



With the type which, according to LeConte, comes from the Sas- 

 katchewan region, Hudson Bay Territory, there have been placed 

 two examples collected by Hubbard and Schwarz at Detroit. In 

 both of these the sides of the prothorax are a little convergent in 

 front, and one of them has one antenna 10-jointed, the other 9- 

 jointed. The thoracic gibbosity is better marked than in either 

 carinatus or nmbrosus, but aside from this and the number of anten- 

 nal joints the Detroit specimens could hardly be separated from 

 umbrosus. These variations are puzzling and I am rather strongly 

 inclined to believe that when sufficient material shall have been 

 studied, both linearis and umbrosus will prove to be nothing more 

 than extreme forms of the variable carinatus. 



4. H. pusillus n. sp. — Very small, reddish brown, prothorax scarcely as 

 wide as the elytra, disk strongly gibbous and compressed behind, elytral striae 

 more feebly impressed, at least on the disk, and somewhat more finely punctate 



TRANS. AM. ENT. SOC. XXXI. JUNE, 1905. 



