OCR Text |
Show 1866.] MR. F. p. P A S C O E O N T H E 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 not 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 oblong 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; prothorax 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, indeterminately 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 on 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 antennae 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 supported 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. CMyzomedus, Pascoe, Long. Malay, p. 115. * In Cacia inculta this character is present or absent in the same species. PROC. ZOOL. Soc-1866, No. XVI. |