1866.] MR. F. P. PASCOE ON THE COLEOPTERA OF PENANG. 523 



by Mr. Fortune in the north of China, and it has since been found 

 commonly on the coasts of Mantchuria mixed with numerous Euro- 

 pean or boreal forms. The occurrence, therefore, of a second species 

 so remote from the locality of the first is very interesting. 



Sigeum. 



Caput inter oculos planatum, subdilatatum. 



Antennae apicem versus serratce, 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 

 flattish 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. (PI. 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 Pachyleria, some species of this 

 genus having those organs coloured precisely in the same remarkable 

 manner. All the Enryarthra 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 abdo- 

 minal 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 Tenebrionidce amongst 

 the Heteromera, but not closely embracing the abdomen. 



