1866. J MR. F. P. PASCOE ON THE COLEOPTERA OF PENANG. 529 



Elytra narrow, nearly parallel at the sides, the apex truncate or 

 entire. Legs short, equal ; femora thickened in the middle ; tarsi 

 as long as their tibiae, the posterior with the three basal joints sub- 

 equal. Pro- and meso-sterna simple. 



Among the Cerambycince with an unarmed prothorax this genus 

 will be distinguished by its serrated antennae, which cuts it off from 

 Calpazia, Dialeges, and others ; and its large facetted eyes will pre- 

 vent its being confounded with Lachnopterus. I have already pub- 

 lished a member of this genus under the name of Cerarnbyx mica- 

 ceus (Trans. Ent. Soc. ser. 2. iv. p. 237), at the same time pointing 

 it out as a "form apart" from the true species of Cerarnbyx. In 

 all there is a deep groove on the vertex extending to between the 

 upper portions of the eyes, which it just divides. The three species 

 here described are distinguished by the sculpture of the prothorax 

 and the form of its apex. 



Imbrius lineatus. (PI. XLI. fig. 12.) 



I. fusco-brunneus ; prothorace profunde et irregulariter sulcato, 

 inter sulcos tuberculis sitis, apice producto, bidentato ; elytris 

 vittis griseo pubescentibus indutis. 



Reddish brown ; head with scattered greyish hairs ; eyes separated 

 above only by the deep vertical groove ; palpi and antennae ferrugi- 

 nous, the latter with the third, fourth, and fifth joints nodulous in 

 the male, and the third longer than the second ; in the female the 

 second is longest ; prothorax subcylindrical, slightly rounded at the 

 sides, the anterior and posterior borders of equal breadth, the disk 

 deeply grooved transversely and longitudinally, so as to present four 

 transverse series of tubercles ; scutellum broadly triangular ; elytra 

 finely punctured, covered with several oblique stripes of greyish 

 pubescence ; body beneath and legs pale ferruginous, with a thin 

 greyish pile. Length 8 lines ( 6 ), 6| lines ( $ ). 



Imbrius ephebus. 



I. ferrugineus, elytris omnino griseo pubescentibus ; prothorace 

 profunde in medio longitudinaliter bisulcato, lateribus trans- 

 verse sulcatis, apice subproducto, integro. 



Pale rusty brown, the elytra with a delicate uniformly greyish 

 pubescence ; head with scattered greyish hairs ; eyes nearly approxi- 

 mate above ; antennae with the second joint longest in the female 

 ( <S unknown to me) ; prothorax subcylindrical, slightly rounded at 

 the sides, the disk with two longitudinal grooves including three or 

 four oblong tubercles ; the sides transversely grooved, all the tuber- 

 cles clothed with a yellowish woolly pubescence ; scutellum trian- 

 gular ; elytra finely punctured ; body beneath aud legs ferruginous, 

 with a scattered greyish pubescence. Length 9 lines. 



Imbrius strigosus. 



I. fuscus, nitidus, pube interrupta grisea tectus ; prothorace 

 transverse sulcato, apice haud producto. 



