52 



superne nigris, antenm's flavis, articuh primo piceo; clypeo antue puhe- 

 sccnte; ehjtris obsolete striatn. — Long. 16 — 17 mill. 



0. Mouhoti Harold. Col. Heft. XIII. p. 88 (1875). 



Mas: Vertice licorni, cor7iubus valde elongatis, dhergentihus ; p-o- 

 thorace cornu compresso, oblique erecto, infra cornu profunde excavato. 

 laevi. 



Fem.: Vertice cornubus brevibus; prothorace disco carinis duabux, 

 brevibus, antice rettiso, lateribus gramdatis. 



Clypeus in tho t with tlie surface rugose and in front pubescent, 

 tho Vertex with an orcct lamina which is prodiiced on cacli side as a 

 vcry long hörn, the horns are directed outwards and a little curved, 

 scen hiterally their oxtremity thongh ratlier slender is obliquoly trun- 

 cate, they extend backwards ovcr tlio thorax, biit stand iip at a di- 

 stance from its surface, in front of tho ba.se of tho liorn is a curved 

 line, continous "with which at each end is a raised line extending 

 along the outer edge of the hörn, on the inner and posterior edge 

 of the hörn is a raised cronate or serrate line. The thorax has a 

 laterally comprossed lobe or hörn extending forwards and upwards, 

 the Upper edge of which is channelled, in front of the liorn it is so 

 retuse as to form qnito a deep transverse cavity, its surface is im- 

 punctate, and is of a silky green colour and opaque, with the cx- 

 ception of the retuse part which is shining. 



Clypeus in tho ? as in the male, except that tho vertical lamina 

 is produccd at each end only into a very short hörn; thorax a little 

 retuse in tho middlc in front and in the middle with two short longi- 

 tudinal cariniform prominences, the sides are granulated, the middlc 

 betwcen the prominences being almost without sculpturo. 



In both sexes the elytra are of a green colour with a silky dull- 

 ness, tho suture slightly raised and shining, tliey are extremely fiiiely 

 striate , and almost without puuctuation, The pygidium is rather 

 coarsoly, but indistinctly and sparingly puiictured. The nietasternum 

 is a little compresscd or carinate along tho raiddlo in front, and on 

 each side of this it is punctured, tho punctured part as well as the 

 sides bearing a fine pale pubescence. 



Siam and Laos (Mouhot!). 



This fine species is closely allied to the 0. FJliotU , but it is 

 considerably smaller, the elytra are concolorous with tho thorax, tlie 

 male has no longitudinal carina on the lamina betweon the horns; 



