15S Mr. G. J. Arrow on the 



2, capite postice minute tuberculato ; prothorace convexo, antice 

 vis impresso, grosse et confluenter punctato, spatio subcirculari 

 postico uitido, parce et minute punctato, lateribus antice valde 

 approximatis, postice fere parallelis ; elytris grosse sublineare 

 punctatis ; pygidio segmentoque ultimo ventrali deuse et aequaliter 

 rugosis, breviter rufo-setosis. 

 Long. 24-62 mm, ; lat. max. 14-18 mm. 



Hab. Borneo: Sarawak; Singapore. 



This is nearly related to the Javan D, croesvs, F., but is a 

 little smaller, the cephalic horn of the male in well-developed 

 specimens is longer, more strongly curved, and bifid at the 

 end, and the median process of the thorax is narrower. In 

 a small male from Sarawak the cephalic horn is short and 

 not at all bifid and the prothorax is abruptly vertical in 

 front but not produced into a horn. The female has only a 

 small tubercle upon the head, and is shorter, broader, aud 

 much more strongly punctured than the male. 



Burmeister has bestowed upon a West-African species the 

 name of PhyUognathus bacclins, but as the latter name was 

 previously used by Mulsant for a variety of the European 

 Phyllofjiiatlius silenus, its re-use is not admissible, and I have 

 therefore changed the name of Burmeister's insect to 

 P. burmeisteri. 



I have found by examination of the type, now in the 

 Oxford Museum, that the insect supposed by Burmeister 

 and Lacordaire to be Bothynus ascatiius, Kirby, is quite a 

 different species Avith a very strong prothoracic tubercle and 

 large and deep excavation in the male, and distinctly striated 

 elytra. The false Ascnnius with almost smooth elytra must 

 be called by the name given to the female, Bothynus medon, 

 Germ. 



The genus Corynoscelis cannot, in my opinion, be retained 

 as distinct from the older Bothynus, the females being prac- 

 tically inseparable. Bothynus monstrosus, Bates, is only a 

 deformed specimen of B. shnplicit arsis, Bates; and Crato- 

 cnemus niger, Blanch., which Lacordaire thought possibly a 

 female specimen of Thronistes, seems to me to be more 

 probably a Bothynus. 



Semanopterus depressus, Hope, and subaqualis , Hope, are, 

 I believe, synonyms of S. {Phileurus) subcostatus, Cast., Hist. 

 Nat. Ins. ii. 1840, p. 116. 



Papuana, gen. nov. 



Corpus breviter cylindricum. Caput triangulare, cornutum ant 

 tuberculatum. Clypeus truncatus. Maudibulae detectse, extu 



