202 OMOCYRIUS JANSONL 



The head with a raised smooth line along the middle 

 which is replaced by a longitudinal impression on the 

 occiput; densely punctured all around the antennary cavi- 

 ties and on the vertex; the basal half of the mandibles 

 corrugate , the apical half smooth , the lateral surface 

 deeply hollowed. The antennae not quite extending to the 

 end of the elytra, the three basal joints finely rugose, the 

 scape however somewhat coarser ; the 3rd joint slightly 

 thickened at the apex and longer than the scape, the 4th 

 and 5th thickened throughout, and each of them about 

 as long as the 3rd , the 6th and following joints much 

 smaller, slightly decreasing in length. 



The thorax distinctly longer than broad at the base, 

 cylindrical , sparsely covered with minute glossy granules 

 on the disk, with an inconspicuous impressed line along 

 the middle and with two faint transverse impressions, the 

 basal one of which is more distinct; at the middle of the 

 sides a very small tubercle is present. The scutellum nitid, 

 covered with a delicate greyish pile; its apex broadly trun- 

 cate with rounded angles. 



The elytra irregularly covered with large and deep punc- 

 tures which are more densely set on the sides leaving 

 however the strongly protruding shoulders free; moreover 

 each elytron shows three slightly raised lines , one of which 

 runs side by side the suture and disappears towards the 

 base; the elytra slightly taper towards and are conjointly 

 rounded at the apex. 



The legs are nitid. The hind margin of the apical ven- 

 tral segment broadly emarginate. 



Hah. Elopura : North Borneo (W. B. Pryer). — A single 

 female specimen from the collection of Mr. Pryer. 



I am much pleased in naming this beetle after Mr. 

 Oliver E. Janson , who most kindly sent me this and the 

 following species for identification. 



Omocyrius Jansoni Rits. is the second hitherto described 

 species of this genus. It differs from the type {Omocyrius 

 fulvisparsus Pascoe, Proc. Zool. Soc. London. 1866. p. 246; 



Notes from the Leyden Museuin, "Vol. X. 



