1866.] MR. F. P. PASCOE ON THE COLEOPTERA OF PENANG. 531 



mucronate ; body beneath brownish luteous, finely pubescent ; legs 

 brown ; antennae about as long as the body, brown, with subulate 

 processes luteous and finely fringed on each side in the direction 

 of their axis*. Length 20 lines. 



Rhytidodera. 

 Hammaticherus, White, Cat. Long. Brit. Mus. p. 132. 



Rhytidodera simulans. 



Hammaticherusl simulans, White, op. cit. p. 132. 



It is difficult to say why this species, except for its transverse 

 instead of longitudinal prothoracic striae, was placed (even though 

 doubtfully) with Hammaticherus, seeing that Rhytidodera, to which 

 it naturally belongs, is proposed for a nearly cognate species imme- 

 diately after it, and to which indeed Mr. White compares it. Ham- 

 maticherus, a name coined by Megerle, in compliance with a most 

 faulty principle, to supersede the old name of Cerambyx, was first 

 described and applied by Serville to Plocoederus of Dejean, Ceram- 

 byx being properly retained by the same author for the European 

 species, which are naturally the most familiar, and, in the usual 

 sense, the most typical. 



Rhytidodera cristata. (PI. XLIII. fig. 1.) 



R. supra pube purpureo-fusca dense vestita ; prothorace utrinque 

 longitudinaliter bicarinato, in medio crista pilosa elliptica in- 

 structo. 



Densely covered above with a dark purplish-brown pubescence ; 

 head with a coarse irregular pubescence ; prothorax broader than 

 the head, sulcated at the base and apex, the intermediate part with 

 three smooth longitudinal grooves on each side, enclosing two well- 

 marked ridges, between the two series of grooves an elevated ellip- 

 tical protuberance densely covered with perfectly erect hairs ; scu- 

 tellum subtriangular, truncate at the apex ; elytra more than three 

 times the length of the prothorax, broadest behind the middle, the 

 apices emarginate with each angle shortly mucronate ; pubescence 

 slightly mixed with greyish hairs, especially at the sides ; body be- 

 neath and legs reddish chestnut, with a thin greyish pile ; antennse 

 considerably shorter than the body, the third to the eighth joints 

 nodose at the apex, scape more densely pubescent. Length 13 lines. 



The clothes-b?-ush-\ike crest on the prothorax is very remarkable 

 and peculiar. The protuberance that forms the basis appears to be 

 deeply constricted all round, and the upper surface to be somewhat 

 convex. The elytra are more or less clouded, according to the light, 

 the dark spots being more particularly visible on each side behind 



* A nearly allied genus has been recently described by M. Kaup (Einige Ce- 

 ramb. der Grossherzog. Sammlung zu Darmstadt) under the name of Westwoodia. 

 This name has, however, been twice previously used ; I have therefore to propose 

 Jprosictus in its stead, under which it has long stood in my cabinet waiting 

 publication in the ' Longicornia Malayana.' 



