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Show 1866.] MR. F. P. PASCOE O N T H E COLEOPTERA OF PENANG. 523 by Mr. Fortune in the north of China, and it has since been commonly on the coasts of Mantchuria mixed with numerous European or boreal forms. The occurrence, therefore, of a second species so remote from the locality of the first is very interesting. SlGEUM. Caput inter oculos planatum, subdilatatum. Antennae apicem versus serratar, art. tertio scapo longiore. Pedes postici graciles, elongati. This genus differs from Euryarthrum, Bl. (Blemmya, Pasc), in its longer and narrower antennae, more distant at the base, the broader flatfish forehead, and long attenuated posterior legs. The elytra are in no wise carinated; and, owing to the weaker and more slender form, the habit is notably dissimilar. SIGEUM HUMERALE. (PL XLI. fig. 2.) Blemmya humeralis, Pascoe, Trans. Ent. Soc. ser. 2. iv. p. 99. In Mr. Lamb's specimen the lines on the elytra, instead of being white, are yellow. Mr. Wallace once took it in Singapore. EURYARTHRUM. Euryarthrum, Blanchard, Hist. Nat. des Insectes, t. ii. p. 149 (1845). Blemmya, Pascoe, Trans. Ent. Soc. ser. 2. iv. p. 42 (1856). No less than six new species are in this collection, all with the terminal joints of the antennae from the sixth, or in two from the seventh, inclusive, ochreous yellow. Two of these species, E. cari-natum and E. lambii, are in other respects almost identical with E. albocinctum and E. bifasciatum respectively, confined, so far as we know at present, the former to Singapore and Sarawak, the latter to Sarawak only. In general form and coloration they are strikingly alike, and in the latter respect are imitated by Asmedia, which, as we shall see, has the antennae of Pachyteria, some species of this genus having those organs coloured precisely in the same remarkable manner. All the Evryarthra are intensely black, very closely and finely punctured, especially on the prothorax, and are furnished above with one or more bands of silky white or yellowish hairs. The under surface is clothed with a thin delicate silvery pile, the shade varying according to the light; but generally it is more condensed, forming well-marked lines, on the edges of the abdominal segments and sterna. The pubescence is so slight on the legs that it can only be detected by a good lens. In many individuals the basal abdominal segment is very large, the others being reduced to mere rings. I am not satisfied whether this is merely sexual or not. The most striking peculiarity, however, of this genus is a well-marked rim round the elytra similar to that of some of the Tenebrionidar amongst the Heteromera, but not closely embracing the abdomen. |
