1866.] MR. F. P. PASCOE ON THE COLEOPTERA OF PENANG. 251 

 MONOCHAMUS FISTULATOR. 



Lamia fistulator, Germar, Ins. Nov. Sp. p. 478. 

 Very generally distributed in India, and extending also to Au- 

 stralia (Brisbane), where, however, it seems to be very uncommon. 



MONOCHAMUS MUSIVTJS. 



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 verv 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 exa- 

 mine a good series of individuals. M. musivus has also been found 

 by Mr. Wallace at Singapore aud 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 my 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 thinuer 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 plxjmosa. 



Cerambyx plumosus, Olivier, Entom. iv. no. 67. p. 98, pi. 20. f. 1 52. 



Imantocera and the following genera of this subfamily are very 

 aberrant members of the Lamiince, and are but slightly connected 

 among themselves. Although three species of this genus are de- 

 scribed, 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 /. penicillata, Hope*. The species or sub- 

 * See Journ. of Entom. i. p. 192. 



