NORTH AMERICAN COLEOPTERA. 173 



Descriptions of some new €ER.4IfIB¥CID^£ with notes. 



BY GEORGE H. HORN, M. D. 



A few new species of Cerambyeida3 have accumulated since the pub- 

 lication of the posthumous memoir of Dr. LeConte, descriptions of 

 which will be found in the following pages. In order that some of the 

 genera might be better understood new studies have been prepared, and 

 these with the tables already published give very nearly all our species 

 in synoptic form. 



The discovery of some hitherto unobserved characters in Monilema 

 suggests the hope that something may yet be done to render the descrip- 

 tions of the Mexican species intelligible. 



HYPEXIIilS n. g. 



This name is proposed for a small species allied to Gracilia and Exilis 

 with the following special characters : 



Antennae % twice as long as the body, joints 3-11 gradually increasing in length. 

 Eyes moderately prominent, coarsely granulated, deeply emarginate. Maxillary 

 palpi much longer than the labial, the terminal joint broad, securiform; last joint 

 of labial narrowly oval, truncate at tip. Femora clavate; first joint of hind tarsi 

 longer than the next two. 



In all other characters the species resembles Gracilia. The structure 

 of the maxillary palpi relates it more closely to Exilis, but the structure 

 of the antennae (the third joint being shorter, not longer than the fourth) 

 and the broader head are sufficient to separate it. 



H. pallida, n. sp. — Slender, pale testaceous. Head across the eyes wider 

 than the thorax, surface coarsely punctured. Thorax elongate, one-third longer 

 than wide, sides at apical third parallel, then gradually wider to two-thirds, arcu- 

 ately narrowing to base which is slightly wider than the apex, disc slightly flat- 

 tened posteriorly, surface rather coarsely punctured and rugulose. Elytra wider 

 than the tliorax, humeri distinct, sides straight, slightly converging, apices sepa- 

 rately rounded, suture at tip slightly dehiscent, disc rather flat, a vague elevation 

 from the humeri to near the tip, surface evenly and closely punctate, more finely 

 than the thorax. Thorax beneath coarsely but sparsely punctate, abdomen shin- 

 ing, very sparsely punctate. Length .22 inch ; 5.5 mm. 



More slender than Gracilia pygmsea, more coarsely punctured and 

 paler. 



One specimen S , given me by Mr. Charles Wilt, collected in Texas. 



