Coleopterous Suhfamily Dynastinas. 161 



indistinct. The frontal tubercles of the head are more 

 distant from one another. The cedeagus of the male is 

 more like that of H. peringuerji than of H. meles, but is 

 broader and without pointed processes in its anterior part. 



Heteronychus glabricollis, Burm., included in Heterolrgus 

 by Prof. KolbCj belongs to the genus Cj/phonistes{= Cephiso- 

 dotiis, Fairm.), in which the front tibia is simply three- 

 toothed and the front tarsi of the male are thickened. 

 Cyphonistes impressicollis , Fairm., is apparently a synonym 

 of the last. 



Heteronychus capreolus, Qued., another insect placed by 

 Prof. Kolbe in Heteroligus, is one of a group of species 

 having well-marked characters in common for which another 

 genus must be formed. The best-marked features are the 

 truncate clypeus with spinose anterior angles and the very 

 sharp, recurved teeth at the outer edge of the mandible. 

 The species seem to be characteristic of the West African 

 fauna. I propose to call them 



Prionoryctes, gen. nov. 



Corpus convexum, subcylindricum. Clypeus brevis, lateribus 

 convergentibus, antice truncatus, angulis acute et oblique spinoso- 

 productis. MandibulsB extus profunde incisae, denies tres acutas, 

 valde recurvatas, utrinque instructas. Maxillae fortiter 6-dentatoe, 

 dentibus 4 inferioribus geminatis, palporum articulo ultimo 

 raagno, truncato. Mentum antice profundo fissum, palporum 

 articulo pen ultimo transverso. Mesosternum medio erectum, 

 subcj'-lindricum, siimmo truncato. Tibiae anticte acute quadri- 

 dentatae. Tibiae posticae extus apice dentibus circiter sex obtuse 

 dentatae. Propj'gidium striis stridulatoriis medio obsoletis sat 

 late incisum. Tarsorum posticorum articulus primus supra 

 productus. Mas et fcemina visu vix dissimiles. 



I refer to this genus, in addition to Heteronychus capreolus, 

 the three following species, the first of which may be 

 regarded as the type. 



Prionoryctes rufopiceus, sp. n. 



Rufo-piceu3, subtus breviter rufo-hirsutus, capitc toto rugoso, fronte 

 medio leviter depressa, tuberculis duobus sat remotis armata ; 

 prothorace grosse, fere aequaliter, punctate, omnino marginato ; 

 Bcutello inaequaliter punctate ; elytris annulato-punctatis, lineis 

 punctorum quatuor geminatis striaque siiturali profunda, inter- 

 stitiis minute marginibusque externis confuse punctulatis : 



Ann. & Mag. N. Hist. Ser. 8. Vol. viii. 11 



