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Show 1866.] MR. F. P. PASCOE O N T H E COLEOPTERA OF PENANG. 215 cylindrical, with a median tooth at the side, the base subbisinuate. Elytra broadest at the base, the shoulders prominent, apex rounded. Legs in the males elongate, the anterior longest, their tarsi dilated and fringed; in the female the legs comparatively short, but all of nearly equal length, the tarsi neither dilated nor fringed. Presternum simple. Metosternum toothed. The closely approximate and nearly erect antennary tubers separate the insect on which this genus is founded from Monochamus, as well as from the Lamiinar-its position appearing to me to be between Pharsalia and Triammatus, the long legs of the male, inter alia, distinguishing it from the former, and the normal antennae from the latter. The scape is remarkably constricted at the base above the articulating portion, the outer side of it, indeed, is so produced as to form a very acute angle. CYCOS SUBGEMMATUS. Monochamus subgemmatus, J. Thomson, Arch. Entom. i. p. 294 (1857). Monohammus georgius, White, Proc. Zool. Soc. 1858, p. 407. A handsome species originally discovered in Sylhet, and apparently not uncommon in the more eastern Himalayan range. PERIBASIS. Peribasis, J. Thomson, Syst. Ceramb. p. 86. PERIBASIS ASPERSA. Monohammus aspersus, Pascoe, Trans. Ent. Soc. ser. 2. iv. p. 48. Apparently a common species at Penang and Singapore. ^PERIBASIS PUBICOLLIS, Pascoe, Long. Malay, p. . Taken also by Mr. Wallace at Singapore and Sarawak. Monohammus I ar vat us, White (Proc. Zool. Soc. 1858, p. 406) is also a Peribasis. OMOCYRIUS. Caput exsertum, infra oculos sensim latiore. Antennae art. 4, 5, in utroque sexu, omnino incrassatis. Elytra ad humeros producto-lobata. Pedes antici, in maribus, perlongi. Head exserted, narrowed above and gradually widening below the eyes; antennary tubers very stout and approximate, but not contiguous. Eye3 small, broadly emarginate. Antennae longer than the body in the male, shorter than the body in the female, the scape obconic, the third joint longer than the scape, clubbed at the apex, the fourth and fifth thickened throughout in both sexes, in the female, however, gradually smaller towards the base, the sixth and remaining joints shorter than the fifth, and nearly equal in length, except the last in the male, which is longer, subulate, and curved. Prothorax oblong, rather narrower anteriorly, toothed at the sides, |