NORTH OF MEXICO. 



371 



Middle plate of mentum transversely oval; interstrial 



spaces of elytra denselj punctulate. punctulata. 



Last joint of antennae oblique, pointed. imberbis. 



Epistoma deepl) emarginate. longula. 



Lower edge of anterior femora with a broad fossa near the tip, and 



^lightl) emarginate. mentalis. 



The groove of the lower edge of the anterior femora differs but little in the first five 

 5. and is limited anteriorly by a ridge extending from the base to the apex, so that 

 the lower edge of the femur when viewed from the front is verj nearlj a straight line. In 

 the last species however, the channel is replaced by a broad fossa rather deep ;r than the 

 groove in the other species, defined anteriorly by a ridge, not extending to the base, which 

 when viewed from the front appears emarginate near the apex of the lemur. The remain- 

 ing characters in the table are sufficiently plain to be readily recognised. 



I", i in y ressa, Mels., Pro< \ ad. '■'■■ 64. 



Our largest species, and for a long time considered identical with the Europ hi culi- 

 )Mri8, from which it differs bj its larger size and different sculpture of mentum (See I.e. 



eelite. New Specie-. ]i. 1 •_>:$). 



I length .4(i inch. 



Occurs abundantly everywhere in the Eastern and Middle Stat 



r. imberbis, Lee, New Species, \>. 123. 



Similar in form and sculpture to the preceding, differing however, in the transverse 

 middle plate of mentum and the form of the last joint of the antennae. 

 Length .32-.36 inch. 

 Occur- with the preceding, but less common, more abundant in the Southern v 



V". men! ;i 1 i s. n. sp. 



Similar in form and sculpture to imberbis, but differs in having a rather less robust 

 form and a stouter thorax. The terminal joint of the antennae is rounded at tip, not 

 oblique. The anterior femur has near it- apex a rather broad fossa replacing the entire 

 groove of the other species. The edge does not extend from apex to base, and is not a 

 straighl line, but sinuous at the position of the fossa. The middle plate of mentum is 

 deepl] concave, smooth and shining, with the edge somewhat thickened in the male (fe- 

 male not seen). The epistoma i- more nearly truncate than any other of our species. 



Length :■'< I inch. 



Two specimens from Texas and Kansas. 



r. longula, Lee, Pi \' .a. 1861, p 



More elongate ami parallel. Epistoma deeply emarginate. Anterior lemur grooved, 



