. Coleoptera. Chrysomelidæ. Chrysomelidae; Beetles. INTRODUCTION. 99 been used in separating species. The pronotum is usually broader than long, with the surface more or less convex; a trans- verse depression anterior to the basal margin, bounded on each side by a short longitudinal impression (see fig. 88), has classifiea- tory value. In the genus Liprus, Motsch., the prothorax is greatly constricted behind (see fig. 49), its shape recalling that of the genus Lema, F., belonging to the subfamily ChjoceriNjE of Chrysomelidje. The anterior lateral angles are often thickened, each bearing a fine
. Coleoptera. Chrysomelidæ. Chrysomelidae; Beetles. INTRODUCTION. 99 been used in separating species. The pronotum is usually broader than long, with the surface more or less convex; a trans- verse depression anterior to the basal margin, bounded on each side by a short longitudinal impression (see fig. 88), has classifiea- tory value. In the genus Liprus, Motsch., the prothorax is greatly constricted behind (see fig. 49), its shape recalling that of the genus Lema, F., belonging to the subfamily ChjoceriNjE of Chrysomelidje. The anterior lateral angles are often thickened, each bearing a fine seta, and are sometimes slightly expanded and sometimes obliquely truncate. Jn a great number of cases the posterior lateral angles also are provided each with a fine seta (see figs. 120,12ei). The scutellum is small but always visible, triangular or ovate in shape and not very variable. The elytra are never short or reduced, as occurs in some Galeliucin^ ; they may be. Fig. 35.—Profile outline of. a, Hi/phasoma suhmetallica, Jac.; b, Orthaeu viridijjennis, Jac. parallel-sided, with the apex rounded or pointed ; sometimes they are strongly convex, and the degree of convexity may be taken advantage of in separating genera; their surface is often confusedly punctate, and in many genera the punctures are arranged in longitudinal'rows or striae ; the interstices are smooth and the surface never tubereulate or rough. In most HalticinyH the hind ivings are present under the elytra; their absence is exceptional, and in no genus known from British India has the wingless condition yet been noticed. The underside in this subfamily offers many characters which are useful for comparative study, and hence have been frequently used in determining relationships, The episternum generally assumes a quadrangular form, being broader than long and delimiting the anterior edge of the front coxal cavity; this character is employed in doubtful cases to differentiate between h2. Please note that t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbeetles, bookyear1919
