OCR Text |
Show 1885.] COLEOPTERA F R O M JAPAN. 207 distinctly broader than long, impunctate. Elytra slightly wider at the base than the thorax, widened towards the middle and very convex, the apex more pointed, no humeral callus ; their surface covered with closely approached rows of distinct punctures, the latter placed rather irregularly on the striae and near the suture slightly approached in pairs and distinct to the apex ; the sutural margin near the apex is accompanied by an impressed line. Pro-sternum broad, rugose-punctate. Konose. The shape of the thorax and elytra in this species resembles greatly that of the genus Cyrtonus, with which the present insect cannot be confounded on account of the presence of wings. G. templetoni, Baly, is of somewhat similar shape, but differs in every other particular. The plain and not thickened nor impressed sides of the thorax in C. cyrtonoides is another peculiarity of this species. CHRYSOMELA NIKKOENSIS, sp. nov. Ovate, subparallel, moderately convex, black or dark blue, shining ; thorax extremely finely punctured, laterally with a longitudinal basal groove ; elytra subgemiuate, punctate-striate, the interstices very finely punctured. Length 3 lines. Head entirely impunctate, flattened. Antennae rather less than half the length of the body, the first six joints slender and shining, the rest gradually dilated and opaque, black. Thorax about twice as broad as long, slightly narrowed in front, the anterior angles acute and somewhat produced ; the disk with a few very minute punctures, only visible with a strong lens, the lateral margin bounded within anteriorly by a few stronger punctures, posteriorly by a short but deep longitudinal groove, not extending upwards to the middle. Scutellum broadly ovate. Elytra not widened behind, subquadrate, each elytron with ten distinct and regular rows of punctures, the first very short, the others arranged in pairs, the interstices also very finely punctured. Nikko, Yunoshiku, Urasa. It is not without some doubt that I describe this species as new, as several very closely allied forms occur in Northern Europe (C. ordinata, Gebl., C. ambulans, Fald., G. geminata, Payk.) ; but the species from Japan seems to differ from all by the shining and almost impunctate disk of the thorax, on which fine punctures are only visible with a strong lens. The interstices between the double row's of punctures at the elytra are finely but distinctly punctured, the double rows themselves consist of strong and regular lines of punctures not very closely approached in pairs. CHRYSOMELA GEMINATA?, Payk. A single specimen obtained at Hakodate I must refer to this species, although the colour of the upper surface, instead of the general dark blue peculiar to C. geminata, is here obscure aeneous with a slight violet tint. The thorax in the specimen before m e is |