XOR.TH AMERICAN COLEOPTERA. 199 



There seems to be no mention of the carination of the hind angles of 

 the thorax in any species yet described, but in several of our species this 

 character will be observed, and in pugnax may be seen in its best de- 

 velopment. The carina is very near the lateral margin, and from the 

 pubescent covering may have escaped observation in foreign species. 



Two of our species have the front strongly carinate, both belonging to 

 the series with triangularly emarginate eyes, and which, from both char- 

 acters, are related to the dermestoides of Europe. But one species of 

 the series with entire eyes has the front with short carinae, while in all 

 those in our fauna with the obliquely impressed eyes the carinas although 

 obtuse are quite distinct. 



The antenna3 vary in structure with the sex. The three broader ter- 

 minal joints are, in the females, very little longer in their aggregate than 

 the six preceding joints, and not much more than twice as wide as they, 

 while in the male the club is one and a half times the length of the 

 funicle and three times as broad. The club in the male is more hairy 

 than in the female, the hairs longer, and many of them placed vertically 

 on the surface of the joints as in the males of many Elateridte. In the 

 males the eyes are larger and less separated in the front. 



The surface of most of the species is clothed with a fine recumbent 

 pubescence through which the color of the surface can easily be seen, 

 the punctures of the striae, however, bear somewhat longer and more 

 erect pubescence. In validiis, punctatus and sericeus the pubescence is 

 extremely fine and without any semi-erect hairs. The species at present 

 known are as follows : 



Eyes entire 2. 



Eyes with a rather broad triangular impression at the lower border in front, noi 



reaching the middle of the eyes; front strongly bicarinate 3. 



Eyes with a narrow oblique impression very nearly dividing the eyes into two 



equal portions; front indistinctly bicarinate 4. 



2. — Prosternal striae much abbreviated. 



Hind angles without trace of carina. 

 Clypeus distinctly carinate each side; pubescence of body very fine. 



validus. 



Clypeus not carinate ; pubescence coarse pnnctatllS. 



Hind angles with a distinct but short carina close to the lateral margin : 



clypeus not carinate; pubescence moderately coarse. ilivisus. 



Prosternal strise entire or very nearly so. 

 Presternum coarsely punctured in front, the strife slightly abbreviated; himl 



angles not carin ate cou stric tor . 



Prosternum smooth, the strise entire; hind angles of thorax with a long but 

 very fine carina alieiiiis. 



