1866.] MR. F. P. PASCOE ON THE COLEOPTERA OF PENANG. 253 



gener of which has heen referred hy Mr. "White* to Pelargoderus of 

 Serville, quite another genus altogether. A single specimen, a female, 

 is in Mr. Lamb's collection, which agrees with Olivicr'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, nl. 19. 

 f. 142. , 



M. guerinii, White, apparently the commoner species, differs from 

 this, inter alia, in having fewer and isolated spots, uot crowded and 

 more or less confluent, as in the one before us. 



Olenecamptus. 

 Olenecamptus, Chevrolat, Mag. de Zool. 1835, p. 134. 



Olenecamptus bilobus, 



Saperda liloba, Fabricius, Syst. Eleuth. ii. p. 324. 



Olenecamptus serratus, Chev. Mag. de Zool. 1835, p. 134. 



Aut hades 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 tibia; minutely 

 serrated. The basal elytral spots are sometimes tipped with the 

 richest carmine. 



Olenecamptus optatus. 



O.fusco-brunneus, pule grisea brevi tectus ; scut ell o 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 j 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 ; antenna; scabrous, slightly pubescent. Length 

 0—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. Schce- 

 niocera sex-notata of Dejean's catalogue is probably this insect. 

 * Ann. & Mag. Nat. Hist. ser. 3. ii. p. 274. 



