18GG.] MR. F. P. PASCOE ON THE COLEOPTERA OF PENANG. 2 15 



cylindrical, with a mediau 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. Proster- 

 num simple. Metosternum toothed. 



The closely approximate and nearly erect antennary tubers sepa- 

 rate the insect on which this genus is founded from Monochamus, 

 as well as from the Lamiince — 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 pro- 

 duced 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 appa- 

 rently 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. Mono- 

 hammus lar vat us, White (Proc. Zool. Soc. 1858, p. 40G) is also a 

 Peribasis. 



Omocyrius. 



Caput exsertum, infra oculos sensim latiore. 

 Antennce art. 4, 5, in utroque sexu, omnino incrassatis. 

 Elytra ad humeros prodacto-lobata. 

 Pedes antici, in maribus, perlongi. 



Head exserted, narrowed above and gradually widening below the 

 eyes ; antennary tubers very stout and approximate, but not conti- 

 guous. Eyes small, broadly emarginate. Antennce 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, 



