Coleopterous Subfamily Dynastinse. 155 



postico modice prominent, integro, pronoto postice et lateraliter 

 omnino rugoso ; propygidio valde retrorsum producto ; pygidio 

 minute et crebre granulate : 



5 , prothorace valde convexo, grosse rugoso, margine antico medio 

 minute retrorsum dentate ; propygidio modice producto, pygidii 

 jateribus subtiliter rugosis, medio nitido, parce punctate. 



Long. 37-41 mm. ; lat. max. 19-21 mm. 



Hah. Borneo : Sarawak, Kina Balu. 



D. borneensis is very closely related to D. canton, Hope, 

 but is rather more strongly and coarsely sculptured above, 

 and has the thoracic cavity of the male a little less deep, its 

 side walls nearly straight, the anterior processes short, the 

 two dorsal processes placed rather close together, the dorsal 

 lobe short, not notched in the middle, and without a smooth 

 depression on each side. The females of the two species are 

 exceedingly similar, but that of D. borneensis has the pro- 

 notum rather more convex and more coarsely sculptured, 

 with the front marginal carina minutely angulated in the 

 middle. In both sexes, in addition to the more coarsely 

 sculptured elytra, the scutellum is rugose, except a very 

 narrow outer margin, while in D. caniori it is smooth and 

 shining. 



Dichodontus hexagonus, Kits., is the female of D. coronatus, 

 Burm., wrongly attributed to Malabar. This is one of the 

 female Dynastinae having at first sight all the appearance of 

 a male. The unnecessary multiplication of names in the 

 Lamellicornia is inevitable so lung as the sex of specimens 

 described is not first ascertained with certainty. 



Dichodontus fissicornis, sp. n. (PI. V. figs. 1, 2, 3.) 



Rufe-piceus, nonnunquam niger, modice elongatus, pectore breviter 

 rufo-hirto, clypeo tote rugoso, autrorsum angustato, margine 

 antico recto, angulis minute rotundatis ; prothorace antice a medio 

 valde attenuate, angulis acutis, posticis ebtusis, baud arcuatis, 

 margine basali leviter trisinuato ; scntello utrinque oblique sul- 

 cate, basi leviter ruguloso ; elytris grosse, baud profunde, punc- 

 tatis, postice plus minusve laevigatis, linea tenui suturali incisa : 



<J , capite cornu gracili, valde curvato, ante medium paulo compresso, 

 apice minute dilatate atque bifido, armato ; prothorace postice 

 medio late elevato, summo fere horizentaliter antrorsum producto, 

 processu sat angusto, apice emarginato-truncato, thoracis super- 

 ficie medio (processus latere inferiori excepto) Icevi, lateribus 

 grosse luaulate strigosis, margiuibus lateralibus medio angulatis, 

 antice valde, postice leviter, approximatis ; elytris antice fere 

 obsolete punctatis, postice fere Isevibus ; pygidio basi dense 

 rugoso, medio crebre, apice parce, punctate ; 



