NTTIDULIDAE. 151 



Tribe IV.— CYCHRAMBNI. 



The species of this tribe are rounded or oval, convex insects, 

 living in fungi. Maxillae with one lobe. Labrum distinct. 

 Thorax margined at base, covering the base of the elytra. Elytra 

 covering the abdomen in great part, the pygidium is partly only- 

 exposed. Prosternum more or less prolonged at apex. Tarsi 

 distinctly five-jointed. 



Mesosteriiuui protuberant in front, the middle cox?e widely separated. 

 Prosternum prolonged, dilated, laminiform at tip, covering entirely the 

 mesosternum ; body glalirous, elytra striato-punetate. 



Oxycnemus. 

 Prosternum less prolonged, feebly dilated at tip, not covering entirely 

 the mesosternum ; body pubescent, elytra irregularly punctate. 



Amphicrossus. 

 Mesosternum small, oblique, not protuberant. 



Metasternum protuberant, widely separating the middle coxje ; pi'o- 

 sternum not prolonged at tip, not laminiform, vertical behind the 

 anterior coxae ; body glabrous. Cyllodes. 



Metasterniim not protuberant, middle coxae narrowly sej)arate(l. 



Hind tarsi longer than the others ; body glabrous. Pallodes. 



Tarsi equal in length ; body pubescent. Cychramus. 



Psilopyga Lee. is the same as Oxycnemus Er. 



Tribe v.— CYBOCEPHALIIVI. 



Maxillffi with one lobe. Tarsi four-jointed. Body retractile, 

 mandibles in repose resting against the metasternum. Thorax 

 margined at base, covering the base of the elytra. 



The views of DuVal in separating this genus from the Cych- 

 ramini seem correct and worthy of adoption. 



Tribe VI.— IPIIVI. 



Maxilke with one lobe. Labrum connate with the front, suture 

 more or less distinct. Antennae eleven-jointed, terminated by a 

 three-jointed club. Anterior coxal cavities open behind, narrowly 

 inclosed in Filyopharju,^. 



Aiit(!rior coxal cavities open Ixdiind. 



Thorax margined at ba.se, slightly overlapping the base of tin- elytra : 

 body pubescent. Cryptarcha. 



Thorax not margined at base ; body glabrous. Ips. 



Anterior coxal cavities closed behind. 



Thorax not margined at base; body glabrous. Pityophagua. 



