142 A. MATTHEWS. 



ratlier longer and wider than the liead, widest behind the middle, ornamented 

 with large, circular, umbilicated fovea on the disc; sides slightly rounded, poste- 

 rior angles obtuse ; elytra rather short, as long as the head and thorax, but rather 

 narrower at the shoulders, widest near the apex, closely asperate ; sides nearly 

 straight, apex very broad, almost straight ; abdomen rather long, obtuse, pale fer- 

 ruginous,- antennae long and slender, dusky yellow; legs long, robust, bright yel- 

 low. 



Differs from JV. Jlaviventru in its larger size, longer thorax, and re- 

 markable sculpture. 

 United States. 



I¥. flaviventris Motsch. Bull. Mosc. 41, p. 183, 1868.— L. c. .50 mm.— Oval, 



very short, convex, shining, brassy castaneous, with the shoulders of the elytra 

 rufous, clothed with short pale hair; head moderate; eyes not prominent; thorax 

 rather longer and wider than the head, widest at the middle, closely covered with 

 small tubercles, posterior angles right angles; elytra very short, quadrate, as wide 

 as, but shorter than the head and thorax, shoulders rufous ; sides slightly rounded, 

 rather contracted towards the apex, deeply asperate in remote transverse rows, 

 apex slightly rounded ; abdomen much exserted, pale castaneous; legs and an- 

 tennae yellow; latter rather dusky. 



Differs from N. leeviuscidus in its smaller size, shorter elytra, and gen- 

 eral sculpture. 



Central America ( Motschulsky, Champion). 



PTILIINA. 

 PTII.IUM. 



Erichson Ins. Deutsch. ?>, p. 26, 1S45. 



Body generally elongate. 



Antennae 11-jointed, 9 scarcely incrassate, 10. 11 much incrassated, 



moniliform. 

 Head prominent. 

 Pronotum short, either sub-quadrate, or more or less contracted towards 



the base. 

 Elytra entire. 



Abdomen with the pygidium exposed. 

 Mesosternum short, broadly carinated. 



Metasternum large, quadrate, extending to the sides of the body. 

 Venter 7 segments, 6, 7 sometimes sculptured. 

 Legs short, especially the posterior pair. 

 Posterior cox^t; moderately distant, more or less broadly laminated. 



