cmcl species of Crypto ceplialidce. 33 



limbo inflexo ante medium dilatato, lobum distinctmn foi^ 

 mante. Pedes breves, robusti ; coxis posticis distantibiis ; 

 unguiculis basi incrassatis. Prosternum transversum, an- 

 tice ti'ansversim convexum, margine antico antrorsum pro- 

 ducto, interdmn oblique deflexo ; mai'gine postico leviter 

 concavo-emarginato, angulis posticis patdlo productis, 

 acutis ; mesosternum breve, prosterno sequilatum, margine 

 postico bisinuato. 



I have established the above generic group for the 

 reception of C. hemixanthus and other species of similar 

 habit included by Dr. Suffrian in Cryptoceplialus, and 

 placed by him, in his Monograph of the South American 

 species, in the third section of that genus. Stegnocephala 

 presents a remarkable similarity to Monachus, from which 

 genus it is separated by the prodiiced anterior border of 

 the prosternum, as well as by the larger size, larger eyes, 

 often contiguous at the apices in the $ , and by the longer 

 antennae ; from Cryptocephalus it is distinguished by the 

 broad, very convex, Monachus-Wko, form, the widely sepa- 

 rated hinder coxc© and the strongly lobed* sides of the 

 elytra; also by the short, very transverse mesosternum, 

 the apex of which is bisinuate ; the antennae are shorter, 

 their six or seven outer joints being usually thickened, 

 and forming a slender club. Cryptocephalus turgidus, 

 Suffrian, does not belong to the present genus. 



Genus Nyetra. 



Corpus oblongum, subcylindricum, pube adpressa dense 

 vestitum. Ca^^M^thoraci insertum, perpendiculare; oculis 

 parvis, remotis, subrotundatis, integris ; mandihuUs $ 

 elongatis, basi intus lobatis, apice curvatis ; mandihuUs 

 $ non elongatis ; clypeo $ antice in lobum oblongum pro- 

 ducto ; clypeo 2 antice emarginato, non producto ; anten- 

 nis corporis dimidio multo brevioribus, gracilibus; articulis 

 primo elongato, paullo incrassato, secundo brevi, tertio ad 

 sextiun gracilibus, fere filiformibus, quinque ultimis leviter 

 incrassatis. Thorax elytris requilatus, basi utrinque bisi- 

 nuatus, lobo basali producto, apice emarginato. Scutellum 



* The lateral lobes on the anterior half of the elytra are formed in the 

 present genus Ijy the dilatation of the inflexed limb ; in Idioccphala, Apo- 

 roeera, Sec, they arc formed yjrincipally liy an extension of the upper 

 surface of the elytra. 



TRANS. ENT. SOC. 1877. — PART I. (aPR.) D 



