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Show 1866.] MR. F. P. PASCOE O N T H E COLEOPTERA OF PENANG. 251 MONOCHAMUS FISTULATOR. Lamiafistulator, Germar, Ins. Nov. Sp. p. 478. Very generally distributed in India, and extending also to Australia (Brisbane), where, however, it seems to be very uncommon. MONOCHAMUS MUSIVUS. M . fuscus, pube dense brunnescente indutus, elytris sparse albo irroratis; vertice capitis impunctato; scutello pallide griseo, apice rotundato; elytris singulis apice rotundatis. Dark brown, with a pubescence varying from pale brownish ochre to rather dark chestnut-brown, speckled on the elytra with very pale grey ; head pale greyish in front, sparsely spotted with brown, each spot inclosing a puncture, the vertex fulvous, entirely impunctate; prothorax transverse, sparingly punctured on the basal half only, or nearly so ; scutellum very pale greyish, subscutiform, with the apex rounded; elytra gradually decreasing from the base, rounded at each apex, rather finely punctured; body beneath ochreous or ochreous grey ; legs and antennae varying from ochreous grey to ashy. Length 7-13 lines. It is with some hesitation that I have come to the conclusion that the several specimens now before me belong to one species. In fact this is one of those genera in which it is almost impossible in many cases to separate the species satisfactorily when it is possible to examine a good series of individuals. M. musivus has also been found by Mr. Wallace at Singapore and Sarawak, and in Celebes. MONOCHAMUS SOBRIUS, Pascoe, Trans. Ent. Soc. ser. 2. iv. p. 246 (var. ?) It would be rash to treat this as a distinct species ; yet Mr. Lamb's single example scarcely accords with m y type, which is from North China, and which is not to be distinguished from another found by Mr. Wallace at Sarawak. It is larger, the pubescence thinner and more ashy, the punctures more decided (but this may in part be owing to its finer pubescence), and the scutellum is uniformly paler and more conspicuous. IMANTOCERA. Imantocera, J. Thomson, Arch. Entom. i. p. 188; Essai, &c, p. 102. IMANTOCERA PLUMOSA. Cerambyxplumosus, Olivier, Entom. iv. no. 67. p. 98, pi. 20. f. 152. Imantocera and the following genera of this subfamily are very aberrant members of the Lamiinar, and are but slightly connected among themselves. Although three species of this genus are described, it is somewhat doubtful if they be not all referrable to one, or at most forming only geographical subspecies. M. J. Thomson's I. plumosa is said to be I. penicillata, Hope*. The species or sub- * See Journ. of Entom. i. p. 192. |