1866.] MR. F. P. PASCOE ON THE COLEOPTERA OF PENANG. 233 



In size and outline like the last ; but the general colour is white 

 without any brownish grey, the head pubescent in front, and the 

 prothorax riot corrugated ; the antennae and legs similar, except that 

 the black on the knees is less marked. There is only one specimen 

 of each. In both, the third and fourth antennary joints are produced 

 at the apex, but the process is concealed by the tuft of hairs with 

 which the apices of these joints are furnished. 



Cacia herbacea. (PI. XXVI. fig. 3.) 



C. capite fulvescente ; elytris griseo-viridibus, basi et ultra medium 

 dilutioribus ; tarsis infuscatis. 



Head with a pale ochreous-grey pubescence, finely punctured in 

 front ; lip pale brown ; prothorax short, greenish grey with four ob- 

 long blotches, the two central paler ; scutellum transverse ; elytra 

 setulose at the sides, yellowish green, the base and behind the middle 

 paler, the latter with darker blotches forming an incomplete band ; 

 body beneath and legs covered with a fine greyish-yellow pile, the 

 ends of the tibiae and tarsi chocolate-brown ; antennae about as 

 long as the body ( $ ), ochreous, the fourth joint and its tuft brown 

 except at the base, the third finely spined at the apex*. Length 

 4£ lines. 



Cacia obsessa. . 



C. cinerea ; prothorace fusco bivittato ; elytris fusco irroratis 

 vel plagiatis ; tarsis infuscatis. 



Pubescence pale ashy varied with stripes or spots of blackish ; 

 head ashy, a dark band between the eyes ; eyes very small ; pro- 

 thorax short, impunctate, with two blackish stripes, each continuous 

 with a patch behind the eye ; scutellum semicircular ; elytra rather 

 short, sparingly punctured, especially towards the apex, indetermi- 

 nately sprinkled with blackish ; body beneath and legs ashy, the 

 tarsi "darker ; antennae blackish, bases of the second, third, fourth, 

 and fifth joints entirely ashy, elongated tuft ou the fourth black. 

 Length 4 lines. 



Cacia is a somewhat heterogeneous genus, though, on the whole, 

 one readily recognized. In some of the species the two sexes have 

 the autennae nearly equal in length ; in the females of others the 

 seven terminal joints are together scarcely a quarter the length of 

 the remainder, while in the male they are half as long again as the 

 basal portion. Tufts of hairs are found on the third or fourth joint, 

 or on both, or they disappear altogether ; these are sometimes sup- 

 ported by spines or short prolongations of the apices of the joints, 

 or the spines occur without tufts. The colouring is very variable, 

 even occasionally in the same species. 



Clyzomedus. 

 Clyzomedus, Pascoe, Long. Malay, p. 115. 

 * In Cacia inculta this character is present or absent in the same species. 

 Proc. Zool. Soc— 1866, No. XVI. 



