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Show 1866.] MR. F. P. P A S C O E O N T H E C O L E O P T E R A O F P E N A N G . 253 gener of which has been referred by Mr. White* to Pelargoderus of Serville, quite another genus altogether. A single specimen, a female, is in Mr. Lamb's collection, which agrees with Olivier's figure and description, also taken from a unique example, whose locality was at that time unknown. The genus differs from Gnoma in the form of the prothorax, linear femora not thickened in the middle, and the elongate basal joint of the tarsi. MECOTAGUS TIGRINUS. Cerambyx tigrinus, Olivier, Entom. iv. no. 67. p. 401, pi. 19. f. 142. M. guerinii, White, apparently the commoner species, differs from this, inter alia, in having fewer and isolated spots, not crowded and more or less confluent, as in the one before us. OLENECAMPTUS. Olenecamptus, Chevrolat, Mag. de Zool. 1835, p. 134. OLENECAMPTUS BILOBUS. Saperda biloba, Fabricius, Syst. Eleuth. ii. p. 324. Olenecamptus serratus, Chev. Mag. de Zool. 1835, p. 134. Authades indianus, J. Thomson, Arch. Entom. i. p. 192. A common species, found all over India, and as far south as Timor. It is also said to have been found in Australia. O. serratus, Chev., is a remarkable variety with the inner edge of the fore tibiae minutely serrated. The basal elytral spots are sometimes tipped with the richest carmine. OLENECAMPTUS OPTATUS. O. fusco-brunneus, pube grisea brevi tectus; scutello concolore; capite, prothorace elytrisque maculis rotundatis niveis ornatis. Dark reddish brown, covered with a short greyish pile, two or three spots on the cheek, one behind the eye, four on the prothorax, and four on each elytron, i. e. seven on each side from the eye to the apex of the elytra, snowy white; head broader than the prothorax, remotely punctured in front, the vertex impunctate ; prothorax about half as long again as broad, transversely corrugated; scutellum semicircular, greyish brown; elytra rather closely punctured, the sides gradually narrowing posteriorly, the apices slightly dehiscent, each ending in a short mucro ; body beneath and legs with a thin greyish-white pile ; antennae scabrous, slightly pubescent. Length 6-10 lines. I have not seen this species from India; otherwise it appears to be scarcely less widely distributed than the preceding. The description is taken from one of Mr. Wallace's specimens from Singapore. Schar-niocera sex-notata of Dejean's catalogue is probably this insect. * Ann. & Mag. Nat. Hist. ser. 3. ii. p. 274. |
