Geodephagous Coleoptera of Japan. 255 



Trephionus, n. g. 

 Gen. Calatho affine ; sed differt unguibus simplicibus, 

 &c. Corpus fere sicut in Anchomeno, gracile. Caput 

 angustum ; oculi baud prominentes ; palpi sicut in 

 Calathis subgraciles, fere cylindrici apice breviter trun- 

 cati ; menturn dente mediano apice emarginato. Thorax 

 oblongo-cordatus, postice modice angustatus, lateribus 

 ante angulos basales brevissime sinuatis, angulis ipsis 

 (cum margine basali) rotundatis. Elytra apice integra, 

 interstitio tertio impunctato. Prosternum apice baud 

 marginatum. Metathoracis episterna sat brevia postice 

 parum angustata. Tarsi supra glabri subtus sparsim 

 setosi, 4 posteriores articulis 1—4 utrinque sulcati et 

 supra subtiliter alutacei medioque excavati ; maris an- 

 teriores articulis 3 breviter triangularibus. Ungues 

 simplices. 



A genus having a superficial resemblance to the 

 Anchomeni, but with a form of thorax closely resembling 

 that of the Calathi and Pristodactylce, especially of the 

 species in which it is narrowed behind, with the hind 

 angles broadly rounded, and forming a curve with the 

 basal margin. The sinuation of the sides just before the 

 posterior angle is unlike anything I have seen in Calathus, 

 and most nearly approaches the form presented by cer- 

 tain species of Pristonyclius, to which genus Trephionus 

 approximates also in the form of the head and the 

 impunctate 3rd elytral interstice. 



Trephio nus Ni kkoe nsis . 



Gracilis, castaneo-fuscus nitidus, antennis partibus 

 oris pedibusque castaneo- vel piceo-rufis ; capite angusto, 

 laevi, foveis frontalibus parum impressis ; thorace oblongo- 

 subcordato, postice modice angustato, lateribus ante 

 angulum posticum sinuatis, puncto setifero longe ante 

 angulum basalem sito, angulis late (cum margine basali) 

 rotundatis, fovea utrinque basali sat profunda kevi; 

 elytris oblongo-ovatis sat profunde striatis, stria scutellari 

 modice elongata, interstitiis omnibus impunctatis. Long. 

 9 mm., $ , ? . 



Nikko ; Nantaizan. Damp forests in shady places. 



