18G6.] MR. F. P. PASCOE ON THE COLEOPTERA OF PENANG. 257 



Serixia prasinata. (PI. XXVII. fig. 1.) 



S. plumbeo-viridescens, pube velutina albicante tecta ; labro, cor- 

 pore infra pedibusque luleis ; antennis nigris. 



Pale leaden green, the greener hue predominating on the elytra, 

 and covered with a satiny whitish pile, varying with the light ; head 

 very distinctly punctured in front, the vertex and prothorax nearly 

 impunctate, the latter slightly narrower than the head, and the sides 

 a little narrowed towards the base ; scutellum rounded behind ; elytra 

 lightly seriate-punctate, the sides gradually narrower posteriorly, the 

 apices obliquely truncate, each angle produced into a very slight 

 mucro ; body beneath and legs, lip, and palpi luteous ; antennae 

 black. Length 4-5 lines. 



One of Mr. Lamb's specimens is almost entirely of a leaden colour 

 above, and of a much darker luteous beneath, but does not otherwise 

 differ. The species is very distinct. In the ' Journal of Entomo- 

 logy' (vol. i. p. 354) I have proposed to unite Iolea* to Serixia : 

 the slight difference in habit, and the more depressed form of the 

 latter, which, in conjunction with its fimbriated antennas, induced 

 me to consider the three or four species of the supposed group to 

 belong to two veritable but nearly allied genera were subsequently 

 bridged over by newly discovered forms. M. J. Thomson, however, 

 in his ' Systema,' regards them not only as distinct, but refers Iolea 

 to his " groupe" Saperditse verse, and Serixia to his "groupe" 

 Amphionychitee. 



Xyaste. 



Articulus tertius antennarum incrassatus, scepissime hirsutus. 



Scapus tenuiter cylindricus. 



Tarsi antici dilatati, articulis tribus basalibus cequalibus. 



As this genus has only one described species, and there are several 

 others in Mr. "Wallace's collection, I shall reserve further remarks for 

 the ' Longicornia Malayans,' only observing that it is distinguished 

 {inter alia) from Serixia by its thickened third antennal joint, which, 

 in the majority of the species, is also closely covered with short hairs, 

 so as to give it the appearance of being thicker than the scape. 



Xyaste nigripes. (PL XXVII. fig. 2.) 



Iole nigripes, Pascoe, Trans. Ent. Soc. ser. 2. iv. p. 255. 



An insect of a uniform dull testaceous colour, with the third joint 

 less thickened than in any of the other species, and therefore not the 

 most typical of the genus. 



ASTATHEINNE. 

 " ASTATHES. 



Astathes, Newman, The Entom. p. 299 (1842). 

 Tetraophthalmns, Blanchard, Hist. Nat. des Ins. ii. p. 161 (1845). 



* Iole was first proposed ; but finding very socn after that a genus of birds 

 was already so desiguated, I altered it to Iolea. 



