LeConte.] TOMICINI. 857 



XYLOTERUS Er. 



In this geuus tlie club of the antenn® is oval, compressed and solid, 

 Avithout articulations ; the basal shining corneous part extends forwards in 

 a narrow band as far as the middle, except in X politus, where it is entirely 

 basal, and the club is indistinctly divided by one round suture ; the rest of 

 the surface is opaque, finely pubescent and sensitive. The funicle is com- 

 posed of two parts, as in the two preceding genera ; the first joint is large, 

 and stout as usual, the remaining part is about equal in length, forming 

 a pedicel to the club, and is divided by two not well marked transverse 

 sutures, thus causing the funicle to be 4-jointed. The eyes are moderately 

 finely granulated and completely divided. The head is large, exserted, 

 and in the (iJ^ is deeply concave. The prothorax is broader than long, and 

 strongly asperate in front in the 9 . l^ss so in the (^. The tibire are 

 dilated, finely serrate on the outer edge, rounded at tip, and very feebly 

 mucronate at the inner angle ; the tarsi have the joints 1-3 rather stout, 

 nearly equal in length ; fourth very small, fifth slender, as long as the 

 second and third united, with simple divergent claws. The hairs are not 

 serrate or verticillate, as in Pityophthorwi, but slender and smooth. 



The four species in our fauna are easily recognized: 

 lElytra with well defined strite of punctures, interspaces 



nearly smooth 2. 



Elytra with ill-defined distant rows of punctures, inter- 

 spaces equally strongly punctured, pubescence 



erect, abundant 4. politus. 



2. Prothorax finely and sparsely punctured at the sides 



towards the base 1. retusus. 



Prothorax finely but less sparsely punctured at the 



sides towards the base 2. bivittatus. 



Prothorax scabrous and granulate behind the middle 3. scabricollis. 



1. X. retusus Lee, Trans. Am. Ent. Soc. 1868, 158. 



Canada one (^. It is quite possible that this is only an extraoi-dinarily de- 

 veloped specimen of the next, but as I have seen no intermediate forms, I 

 would suggest that for the present, it be retained as a distinct species. It is 

 •of larger size, (4-5 mm.; .18 inch), rather stouter, with the prothorax more 

 ■suddenly declivous, and distinctly retuse in front, and less punctured on the 

 :8ides behind the middle. Otherwise the ditferences are chiefly in color, 

 which is of no value in this genus. 



3. X. bivittatus Mannh., Bull. Mosc. 1853, 236; Ajjate biv. Kirby, Faun- 

 Bor. Am. iv, 193, pi. 8, f. 5; Bostrtchus cavifrons Mannh., Bull. Mosc. 

 1843, 297 {(^)\ ibid. 1852, 359; Xyloterus cm. Mannh., ibid. 1852, 385. 



Maine, Canada, Alaska, Vancouver Island. Length 3-3.3 mm.; .12-. 13 

 inch. Varies greatly in color. Usually the front part of the prothorax, the 

 •suture and the margin of the elytra are black: someti'ues only a short, pale 

 stripe is seen on e ich elytron. 



