206 DESCRIPTIONS OF NEW SPECIES. 



One female, Oregon; collected by Lord Walsingham, and 

 kindly given me by Mr. G. R. Crotch. The antenna? are about 

 three-fourths the length of the body. This species resembles 

 entirely the figure of the European X. Spinolse* except that 

 the. basal and subapical spots of the elytra are wanting, and only 

 the two marginal ones remain ; these are transverse, and directed 

 towards each other in a diagonal direction, and extend nearly 

 one-half the breadth of the elytra. The genus is very closely 

 allied to Centrodera Lee, and differs only by the eyes being 

 smaller, less transverse and less prominent, and by the sides of 

 the head being prolonged behind the eyes, suddenly but feebly 

 constricted at the base (somewhat as in Encyclops, etc., though 

 to a less degree), instead of being obliquely narrowed to the neck. 

 These differences are not generic in Acmasops, nor is the form of 

 the head and eyes constant in Leptura. I am therefore disposed 

 to believe that the two genera are not sufficiently distinct. Those 

 who agree to combine them will adopt the generic name Xylos- 

 teus as having many years priority over Centrodera Lee. 



TOXOTUS Skrv. 



532. T. oMtisus. Testaceus subtilissime pnbescens, capite fusco, 

 prothorace latitudine haud longiore, lateribus bisinuato, tuberculo late- 

 rali obtuse rotundato, disco convexo, antice et postice transversim modice 

 eonstricto, vage canaliculato ; elytris vix punctulatis, fere parallelis, 

 apice rotundatis ; oculis parvis, subtiliter granulatis. Long. 15 mm. 



One denuded specimen from Yellowstone basin, Dr. Horn, 

 and another well preserved in Mr. Ulke's collection. Differs from 

 all the other species before me by the less deeply constricted pro- 

 thorax and more obtusely rounded lateral tubercles ; the eyes are 

 smaller than usual, and finely granulated, but more convex than 

 in T. vestitus, with which it agrees in this character; the 3d and 

 5th joints of the antenna? are equal, and the 4th is two-thirds as 

 long ; the head is feebly narrowed behind, but not rounded on 

 the sides. The pubescence is extremely short and fine. The 

 species of this genus are not alike in the eyes; in T. cinnamop- 

 term they are much larger, and less finely granulated, than in any 

 of the others. 



* Vide Du Val, Gen. Col. Eur., iv. pi. 56, f. 262. 



