180 ON THE GENUS JONTHOCERUS. 



The species are moderately numerous and all probably 

 live under the barks of the fallen trees, like J. nigripes ^ 

 observed by Mr. Lewis in Japan. Two species , J. sondaicus 

 and J. foveolatus , described by me are imported in Europe 

 with dry tobacco from Sumatra. 



In the following table I indicate all the species known 

 to me at present and, subsequently treating of each species, 

 I give only the taxonomical characters, being of opinion 

 that anyone using these diagnoses has made himself fami- 

 liar with the generic characters. 



A. Prothorax levis vel obsoletissime 

 basi impressus. 

 a. Caput et rostrum prothoraci vix 

 longitudine aequalia ; prothorax 

 omniuo levis. 



1 J. papMéws^s Macleay. 



aa. Caput et rostrum simul sumpta 

 prothorace longiora ; prothorax 

 obsoletissime basi impressus. 



2 J. mentaweicus Senna. 



A A. Prothorax distincte canaliculatus 

 vel basi foveolatus. 

 h. Caput ad latera pone oculos 

 manifeste angulatum, 

 c. Oculi magni , frons valde an- 

 gusta. 



3. Niger, opacus, elytrorum de- 

 clivitate apicali fulva ; meta- 

 tarso postico articulis duobus 



sequeutibus unitis longiore. . J. carinensis Senna. 



4. Ferrugineo-rufus , metatarso 

 postico articulis duobus se- 

 queutibus subaequali . . . J. Modiglianii Senna. 



cc. Oculi médiocres , frons latior. 



5. Niger, capite , rostro, anten- 

 nis , prothorace humerisque 



Notes from the Leyden M.iiseuna. ^Vol. XX. 



