Phytophagous Coleoptera of Japan. 183 



in length, three lower joints testaceous, stained above with 

 black. Thorax one-third broader than long, sides straight 

 and diverging from the base to beyond the middle, thence 

 rounded and slightly converging to the apex, anterior 

 angles thickened, hinder armed with an obtuse tubercle ; 

 upper surface convex, obsoletely excavated on either side 

 the disk, subremotely punctured. Scutellum trigonate, 

 shining black. Elytra oblong, shghtly dilated posteriorly, 

 convex, transversely depressed below the basilar space, the 

 latter on each elytron slightly raised ; surface distinctly 

 and somewhat closely punctured. 



Genus Arthrotus, Motsch. 



Etud. Ent. vi. p. 38 (1857). 



Arthrotus nigery Motsch. 



Loc. supra cit. p. 39. 



Hah. — Simoda, Japan; M. Gaschkevitch (Mot- 

 schulsky). 



I have not seen specimens of this species, which does 

 not appear to have been met with by Mr. Lewis. 



Arthrotus variabilis. 



Oblongo-ovatus, postice ampliatus, convexus, nitidus ; 

 thorace transverso, fortiter punctato ; elytris subcrebre 

 fortiter punctatis. 



3Ias. — Antenuarum articulis 2^° et 3"° brevibus, asqua- 

 libus. 



Fcem. — Antennaiimi articulo 3''° secundo duplo longiori. 



A. Niger, genubus tarsisque piceis. 



B. Niger, pedibus totis concoloribus. 



C. Niger, antennis basi, elytris pedibusque fulvis, his 



piceo-tinctis. 



D. Fulvus, capite (vertice antennisque basi exceptis) 



corporeque subtus, nigris; pedibus fulvis, piceo- 

 tinctis. 



Long. $ 2,^ 2 i— 3 lin. 



Hab. — Nagasaki, Yokohama, Hiogo, 



Vertex smooth, finely and remotely punctured ; front 

 deeply excavated above the encarpae, excavation coarsely 

 wrinkled ; encarpse oblique, separated from each other by 

 the apex of the clypeus, the latter remotely punctured. 

 Thorax more than twice as broad as long ; sides margined, 

 regularly rounded, hinder angles produced into an acute 

 tooth, anterior angles truncate anteriorly, produced late- 

 rally into an acute tooth ; hinder margin obtusely roimded. 



