NORTH AMERICAN COLEOPTERA. 15 



specimen in the cabinet of Dr. LeConte somewhat smaller, the sides 

 of the thorax a little more oblique and the disc of thorax more 

 sparsely i)unctate ; this I am unwilling on the one specimen to sepa- 

 rate it with another name notwithstanding the fact that it is labeled 

 Kentucky. 



E. amencana resembles capucina in form and color and seems to 

 differ only m the characters noted in the generic description. 



DEIiTOMETOPUS Bonv. 



Form elongate, moderately convex, gradually narrower posteriorly ; antennae 

 moderately elongate, shorter in the female ; head convex, rather deeply inserted ; 

 cly])eus narrower at base than the distance to the eye, the anterior border arcuate, 

 with a slight sinuation at middle ; prothorax as long as wide, diftering in form 

 in the two sexes; elytra gradually narrower to apex, striate; prosternal sutures 

 divergent, triangle of propleurse longer than wide, the antennal groove deep, 

 limited externally by the lateral margin, and not interrupted on the head by the 

 eyes; metasternal episterna nearly parallel, very slightly wider behind, the 

 epimera not visible ; hind coxal plates gradually, but not greatly dilated inter- 

 nally ; last ventral segment obtuse ; legs rather short, first joint of hind tarsi as 

 long as the next three, the fourth slightly dilated, excavated above and slightly 

 lobed beneath, claws simple. 



The differences between this genus and Dromseolus are rather 

 feeble. In the latter the antennal grooves are narrow and not much 

 than one-fourth the width of the base of the propleural triangle, while 

 in Deltometopus the grooves posteriorly are one-half the width of 

 the triangle. 



Two species occur in our fauna. 



Antennae not as long as half the body, pectinate in the % serrate 9 > tlie an- 

 tennal groove distinctly wider behind siiiicenioornis. 



Antennae longer than half the body % , nearly half as long as body 9 , filiform 

 in both sexes, antennal grooves very broad, not narrowed in front, apparently 

 widest at middle rtifipes. 



D. aniociiic'oriiis Say. — Form moderately elongate, gradually narrowed 

 behind, piceous, feebly shining, sparsely clothed with grayish pubescence ; an- 

 tennae not reaching the half of the body, piceous or with the second and third 

 joints testaceous in % , first joint rather stout, second small, third three-fourths 

 as long as the first, fourth triangular, broader and more acute '^ , joints 5-10 

 pectinate % , the branches longer than the joint and gradually longer externally, 

 the eleventh joint slender, longer than the branch of the tenth, joints 5-10 J 

 serrate, the tenth oval, acute, as long as the two preceding ; head densely punc- 

 tate, front slightly concave, the interocular carina interrupted at middle and 

 slightly turned downward to the base of the clypeus, but entirely absent in the 

 female ; thorax a little wider than long, narrower in front % with the sides 

 straight, slightly arcuate near the front angles ; in the female the thorax is widest 

 one-third behind the apex, the sides in front arcuate, posteriorly straight and 



