242 MR. F. P. PASCOE ON THE COLEOPTERA OF PENANG. [May 8, 



Sybra umbratica, Pascoe, /. c. p. 203. 



Occurs also in Sarawak, Mysol, and Temate. Fifty-two species 

 of this genus are described in the work above quoted. 



Atimura. 



Atimura, Pascoe, Trans. Ent. Soc. ser. 3. i. p. 548. 



Atimura bacillina, Pascoe, Long. Malay, p. 158. 



Mr. Wallace finds this species in Sarawak aud Sumatra, and an- 

 other species in the same localities as well as in Singapore. It is 

 one of the few Longicorn genera common and confined to Australia 

 and the Malayan archipelago. 



Xylorhiza. 

 Xylorhiza, Laporte de Castelnau, Hist. Nat. des Ins. ii. p. 4/6. 



Xylorhiza vexosa, Laporte, I. c. p. 47G. 



A handsome insect, sometimes nearly two inches long, common to 

 both sides of the Bay of Bengal. It is lazy in its habits, remaining 

 for a long time in one spot, and, unlike the Longicorns generally, 

 bores into the young and living shoots of trees, probably to deposit 

 its eggs. 



Thylactvs. 



Scapus obconicus. 



Palpi breviusculi, glabri. 



Prothorax utrinque spina valida armatus. 



Head transverse in front ; antenuary tubers very stout and promi- 

 nent, approximate at the base. Eyes narrow, broadly emarginate. 

 Antennae shorter than the body, pubescent, not fimbriated, the scape 

 obconic ; third joint longest, the rest gradually shorter (the last 

 joints are wanting). Palpi rather short, not hairy or only slightly 

 pubescent. Prothorax narrow, unequal, armed on each side with a 

 stout spine. Elytra elongate, cylindrical, irregular, a little depressed, 

 expanded at the apex into a broad angular process. Legs short ; 

 femora fusiform ; tibiae rather shorter than the tarsi. Pro- and 

 mesosterna depressed. 



A remarkable insect, allied to Xylorhiza and Cymatura, is the 

 type of this genus. From both it will be readily distinguished by 

 its strongly toothed prothorax, as well as the different form of the 

 scape. I should have been inclined to consider these, and other 

 species still referred to Xylorhiza, highly individualized members 

 of one group, which, although differing in several technical charac- 

 ters, have a very obvious relationship. This view, however, would 

 not be likely to be adopted. 



Thylactus angularis. (PI. XXVII. fig. 6.) 



T. pube sericea densissima fulvo-brunnea indutus ; elytris late- 

 raliter fasco iiniplayiatis. 



Covered above with a very dense short silky pubescence of a light 



