512 MR. F. P. PASCOE ON THE COLEOPTERA OF PENANG. [Nov. 22, 



Rich metallic green, scarcely shining, with numerous crowded 

 punctures ; upper lip, mandibles, and fore legs red ; prothorax 

 about half as long again as broad, the middle with a darker or bluish 

 stripe ; scutellum black, triangular ; elytra with a golden tinge 

 along the suture, the apex rounded ; body beneath with silvery- 

 white pubescence ; antennae black ; legs, except the anterior, black- 

 ish, the tarsi paler. Length 4 lines. 



Mydasta. 



Antennae apicem versus incrassatce, scapo obconico. 



Elytra integra, postice angustata, lateribus hand declivibus. 



Tibiae robustce ; tarsi subcequales. 



Head slightly produced anteriorly, not constricted behind. Eyes 

 shortly ovate, not approximate above, strongly emarginate. An- 

 tennae half as long as the body, distant at the base, arising close to 

 the eyes ; the scape shortly obconic ; the third joint twice as long as 

 the scape ; the fourth considerably shorter ; the remainder thickened 

 and, as far as the penultimate, slightly produced at the apex ; the 

 last joint conical. Prothorax oblong, strongly constricted at the apex 

 and base, the intermediate portion rounded. Elytra narrowed pos- 

 teriorly, contiguous at the suture, not bent down at the sides. Legs 

 very unequal, the posterior pair by far the longest ; femora strongly 

 incrassated towards the apex ; tibiae stout ; tarsi subequal, mode- 

 rately dilated. Abdomen contracted at the base, the first segment 

 nearly as large as the rest together. 



This genus has almost exactly the habit of Acyphoderes, Serv., 

 but, inter alia, is without its muzzle, and with non- dehiscent 

 elytra. 



Mydasta discoidea. (PI. XLI. fig. 4.) 



M. capite chalybeato ; prothorace aterrimo, antice posticeque, 

 scutello fasciisque (subtus) argenteo-albis ; elytris ceneo-nigris, 

 ferrugineo plagiatis. 



Head bluish black, strongly punctured, especially in front, where 

 the punctures are divided by short vertical lines ; lip brown, bor- 

 dered with yellowish ; prothorax intensely black, deeply and closely 

 punctured, the anterior border dark blue, behind this border, on 

 each side, a band of silvery-white hairs, a similar band on the con- 

 stricted portion behind ; scutellum oblong, with a dense silvery 

 pubescence ; elytra entirely glabrous, brassy black at the base, a 

 large patch of reddish ferruginous (varying in size) occupying the 

 middle and posterior portion, the apex rounded, deep bluish black, 

 punctures at the base almost contiguous, becoming smaller and more 

 distant posteriorly ; body beneath dark purplish blue, the meta- 

 sternum posteriorly and edge of the first segment of the abdomen 

 silvery white ; legs brownish red, shining, the base of the posterior 

 femora and the middle of their tarsi dark brown ; antennae reddish, 

 the last six joints black. Length 7 lines. 



