1885.] COLEOPTERA FROM JAPAN. 191 



double rows of black punctures, their apex produced in a spine ; 

 apex of the femora, tibiae, and tarsi spotted with black. 



Length 2 lines. 



Head deeply triangularly grooved between the eyes. Antennae 

 lialf the length of the body, black ; the second and third joints 

 short, of equal length, fourth slightly longer, the two terminal joints 

 slender and the longest. Thorax subquadrate, nearly as long as 

 broad, the sides straight or slightly concave from before the middle to 

 the base, anterior and posterior margins nearly straight, the space 

 immediately behind the former thickened ; surface impunctate, the 

 anterior margin and three deeply impressed longitudinal grooves 

 on the disk black; of these, the central one is straight and doea 

 not extend to the base, the lateral are oblique and extend to the 

 posterior angles ; a few punctures are also seen in front of the base. 

 Scutellum elongate, black, covered with fine silky pubescence. Elvtra 

 slightly depressed below the base, the intervals between the five 

 black double rows of punctures raised, and as broad as the space 

 between each two single rows ; the apex of each elytron truncate 

 and produced at the outer angle in a long testaceous spine ; posterior 

 first tarsal joint as long as the two following ones united ; each joint 

 as well as the extreme apex of the tibias and femora spotted with 

 black ; the very long claw-joint also stained with piceous at its apex. 



Bukenji, April ; in a pond. 



The single specimen obtained by INIr. Lewis of this interesting 

 little Hcemonia will enter Lacordaire's second division on account 

 of the long first tarsal joint, and the short and equal second and 

 third joints of the antennae. The insect is well distinguished by the 

 shining, not opaque thorax, and by the addition of the central black 

 groove on the disk of the latter. By this last character it may be at 

 once separated from H. equiseti, to which it seems otherwise closely 

 allied. 



Genus Donacia, Fabr. 



DONACIA GRACILIPES, Sp. DOV. 



Elongate, depressed above, narrowed behind, of a metallic bronze 

 colour ; below covered with silvery pubescence. Thorax square- 

 shaped, covered with fine transverse strigse ; elytra obliquely de- 

 pressed below the base, strongly punctate-striate, the interstices 

 transversely wrinkled throughout ; posterior femora with a short 

 tooth. 



Length 3-4^ lines. 



Head less shining, covered with fine pubescence, the space above 

 the antennae raised in shape of two more or less distinct tubercles j 

 vertex without longitudinal groove. Antennae nearly as long as the 

 body, the basal joint metallic, the rest black ; the third and the 

 two following joints of equal length, double as long as the second 

 (in some specimens the fourth joint is slightly longer than the 

 preceding). Thorax square-shaped, the sides constricted near the 

 base, moderately thickened into a kind of callosity near the anterior 

 angles, these latter with a short pointed tubercle, furnished with a 



