new genus of Histerida. 333 



structure advance together, and act reciprocally one on 

 the other. 



NiPONius,* n. g. 

 Corpiis elongatum, cylindricum, nitidum. Caput magnum non 

 retractile, epistomo cornuto ; mandibulis validibus reflexis, biden- 

 tatis. Autennis elongatis, ante oculis insertis, clava ovali 4-articu- 

 lata, 8° obsolete. Pronotum parallelum, punctatum caput longium 

 utrinque marginatum, scutellum minutissimum. Prosternum 

 augustatum marginatum, lobo antico nullo. Elytris tenuis striatis. 

 Pygidium foveolatum. Meso- et metasteruum caualiculatis. Pedes 

 sat elongatis, tibiis extus basali dente armatis. 



Niponius imjyressicollis, n. s. (PI. VIII., figs. 1 — 11). 



Cylindricus, sat elongatus, robustus, niger, punctatus. Antennis 

 pedibusque, nigro-piceis, clava tarsisque rufis ; epistomo cornuto, 

 piceo, transversim bicarinato, thorace gi-osse punctato, utrinque 

 profunde impresso. Elytris striis 1° validis et cteteris puncti- 

 formibus vel obsoletis. Propygidio quadri foveolato. Pygidio pro- 

 fimde bisulcato. Long. 5 — 5^ mm. 



This species is the largest and most robust of the 

 series, and is distinguished from the others by the depth 

 of the impressions in the thorax. I obtained eighteen 

 specimens; gathered in pairs or single examples, from 

 localities ranging from Yuyama in Higo to Junsai in 

 Yezo. 



Niponius osorioceps, n. s. (PI. VIII., figs. 12—14). 



Cylindricus, elongatus, niger, punctatus, pedibus nigro-brunneis, 



epistomo piceo transversim tricarinato, thorace grosse punctato 



utrinque obsolete impresso, elytris striis N. imjn-essicolUs simil- 



limis. Propygidio pygidioque profunde bifoveolatis. Long. 4imm. 



This insect is less robust than the last; the chief 

 specific differences lie in the sculpture of the projDy- 

 gidium. Only two examples were captured, both in 

 Higo, one at Yuyama and the other at Konose. 



Niponius fur catus, n. s. (PL VIII., figs. 15—19). 

 Cylindricus, angustatus, niger, punctatus, antennis, pedibusque 

 piceis, thorace grosse punctato, sine fovea, propygidio quadrisulcato 

 pygidio biimpresso. Long. A\ mm. 



* The name of this genus is derived from the word Nipon, of 

 which Japan is a corrui)tion. . 



