368 COLEOPTERA OF NORTH AMERICA. 



Tribe II.— IVYCTOPORIIVI. 



This tribe consists of but a single Californian genus, Nycto- 

 poris, found under bark. The body is elongate and rough, the 

 elytra are sculptured with numerous rows of acute elevations, 

 and frequently costate ; the epipleuree occupy the whole of the 

 inflexed portion of the elytra. The mentum is large, quadrate, 

 and transverse, the gular peduncle is almost wanting, the sides 

 of the "head beneath are prolonged so as almost to touch the 

 sides of the mentum, thus covering the maxillae except at the base, 

 where they are visible; the last joint of the palpi is but slightly 

 dilated; the front is dilated, concealing the labrura. The. side 

 ])ieees of the metasternum are narrow; the 2d and 3d ventral 

 segments are scarcely emarginate. The legs are moderate, the 

 tibial spurs are small, and the tarsi are pubescent. 



Tribe III.— CRYPTOGLOSSIXI. 



Body oblong, with variable sculpture; the epipleurse occupy 

 01) iy a portion of the inflexed portion of the elytra, which is 

 wider than in the preceding tribe; the mentum is moderately 

 large, oval, and flat, in our genera, and the sides of the head are 

 not prolonged beneath; the gular peduncle is distinct; the last 

 joint of the palpi is slender or slightly dilated; labrum almost 

 entirely concealed by the dilated front. The side pieces of the 

 metasternum are tolerably wide ; some of the ventral segments 

 are strongly emarginate behind. Legs long and stout, tibial 

 spurs not small, tarsi spinous beneath. 



Our genera belong to the group Centriopteras, distinguished 

 by the mesosternum being prominent. 



Kyes emarginate, reniform ; 



Last joint of aiiteniine truncate, smaller than the tenth, 



Cryptoglossa. 

 Last j.oint of antennte oval, pointed, nearly as large as the tenth. 



Centrioptera. 

 Ilyes entirely divided by the sides of the front ; 



Antennje as in Centrioptera. Schizillus. 



Oochila Lee. has been united with Centrioptera, the form of 

 mesosternum and denticulation of the femora not having generic 

 value. The species of this tribe are of moderate size, and occur 

 from Texas and Utah through Arizona to California and Mexico. 



