254 CERAMBYCID^E. 



Genus PERIS SUS. 



Perissus, Chew. Mem. Soc. JR. Sci. de Ltige, xviii, p. 262 (1863). 

 Amaursesthes, Chevr. (in part.) 1. c. p. 327. 



Type, P. X-littera, a species from the Aru Is. 



Range. Oriental and Austro-Malayaii .Regions ; Kashmir and 

 Europe. 



Head very slightly or not at all raised at the sides between the 

 antennae, the latter rather widely separated at the base, the distance 

 between them almost or quite as great as that between the lower 

 lobes of: the eyes ; face rectangular, not carinate. Antennae 

 variable in length, sometimes nearly as long as the body, generally 

 very much shorter. Hind femora extend as a rule past the apex 

 of the elytra in both sexes. 



The structural differences between this genus and some of the 

 forms included in Xylotrechus are very slight. The lateral edges of 

 that part of the front which lies between the antennae are sharp 

 and slightly raised, as in Xylotrechus, but do not extend down- 

 wards to the eyes, and form merely the inner rim of the condylar 

 cavities. The face has no median carina. The prothorax is 

 usually longer and more cylindrical than in Xylotrechus, and the 

 hind femora extend farther beyond the apex of the elytra. 



289. Perissus fuliginosus, Chevr. (Arnaurassthes) Mem. Soc. R. Sci. de 

 Lieye, xviii, p. 328 (1863). 



Head and prothorax black, with a very faint covering of grey 

 pubescence. Elytra dark brown, marked with very narrow bands 

 of ashy-grey pubescence ; the first band begins a little behind the 

 scutellum, diverges from the suture as it runs backwards some 

 distance, and is then curved round so as to extend outwards and a 

 little forwards to the side, where it is again bent back just before 

 it reaches the outer margin ; the second band curves obliquely 

 backwards and outwards from the suture behind the middle, and 

 is interrupted near the middle of its course ; the third band 

 consists sometimes of two small transverse spots on each elytron, 

 and is placed at a short distance before the apex. Antennae extend 

 a little past the middle of the elytra in the c? , not so far as to the 

 middle in the ; the first four joints brown and glossy, the rest 

 dull, covered slightly with grey pubescence. Prothorax widest 

 behind the middle, narrowed strongly at the base, gradually 

 and slightly in front ; the disc rather strongly asperate and 

 slightly raised along the middle. Hind femora extend past the 

 apex of the elytra slightly in the $ , by nearly a third of their 

 length in the c? . 



Variation. The elytra are sometimes of a paler (somewhat 

 reddish-brown) colour between the base and the first baud. 



Length 7^-12 ; breadth 2-3J mm. 



Hob. Northern India : Almora ; Tibet. 



