174 Mr. H. W. Bates on the Longicorn Coleoptera 



having in the middle on each side a large chalky-white spot. 

 Body beneath dull chalky white;; breasts with pinkish streaks, 

 and abdomen spotted with black. Legs black, thinly clothed 

 with grey pile. 



Ega; rare. This handsome species, like the preceding (H. 

 maculosa), approaches Oncideres in many of its characters, espe- 

 cially the elongate eyes, subconvex form of body, and scarcely 

 curved third antcnnal joint; but it lacks the massive head, 

 cylindrical form of body, and short transverse thorax of Onci- 

 deres, and therefore must be classed with Hesycha. 



Genus Trachysomus, Serville. 



Serville, Ann. Soc. Ent. Fr. iv. (1835). 

 (Char, emend.) Buquet, Ann. Soc. Ent. Fr. 1852, p. 345. 



This remarkable group is distinguished from the allied genera 

 chiefly by the elytra being disfigured by tubercular excrescences, 

 and by the antennae being composed of short joints reaching 

 only three-fourths the length of the body. The head is mode- 

 rately narrow, the eyes oblong (not narrow and elongated as in 

 Oncideres), the basal joint of the antennae very abruptly clavate, 

 the third joint very slightly curved, the thorax subcylindrical, 

 and the claw-joint of the tarsi shorter than the remaining joints 

 taken together. The species are found closely clinging to thin 

 woody stems of plants, and strongly resemble portions of the 

 stems distorted by glandular prominences or galls. 



Trachysomus Santarensis, n. sp. 



T. Trachysomo fragifero (Kirbii) valde similis, differt colore ochra- 

 ceo- vel rufo-fulvo ; thorace supra ochraceo ; elytris juxta scutel- 

 lum utrinque spinis quatuor acutis, fasciculis singulis pilorum 

 subapicalibus nigris linea curvata nigra communi connexis. 

 Long. 7} lin. 



This is so closely similar in form of body and tubercular 

 excrescences to the South-Brazilian T. fragifer, that it can 

 scarcely be considered more than a local form of the same stock. 

 It is a little broader and more robust, the thorax is less uneven 

 on the disk, and is there of a bright yellowish-tawny colour. 

 The two tubercles on each elytron, near the scutcllum, are longer 

 and more acute. The elytra are of a nearly uniform reddish or 

 orange-brown hue; the subapical fascicle of hairs is a little 

 further removed from the apex and margin of the elytra; it is 

 connected with the corresponding fascicle posteriorly by a curved 

 black line, and a large portion of the disk behind each basal 

 excrescence is quite smooth. 



Dry woods near Santarem. 



