160 JOHN L. LECONTE, M. D. 



5. X. biographus. — Cylindrical, not very slender, chestnut-brown, antennae 

 and feet paler, shining, thinly clothed with very long hairs ; head sparsely 

 punctured, prothorax ( % ) longer than wide, broadly and deeply excavated 

 before the middle, and covered with flat granules, producing an imbricated ap- 

 pearance, anterior margin obtusely angulated ; the surface at the sides is sparsely 

 punctured, and near the middle of the base is almost smooth; elytra less than 

 twice as long as the prothorax, with rows of large feebly impressed punctures, 

 posterior declivity flat, impunctured, with three acute tubercles each side 

 equally distant from the suture and the margin of the declivity, which is 

 marked with a second row of three or four smaller teeth, and outside of these 

 again are two or three scarcely perceptible denticles. Long. 3 mm. 



One male from Illinois is before me. This species seems to be the 

 analoo'ue of the P]uropean X. monographus, the male of which has 

 the thorax similarly impressed and retuse. It is also related to X. re- 

 tusirollis Zimni., but differs by its larger size, less prominent tubercles 

 of the apical declivity of the elytra, as well as by minor differences in 

 sculpture. 



6. X. retusicollis Zimm. (Ante, p. 14f).) 



7. X. fuscatus Eichh. Berl. Ent. Zeitschr. 1867, 400. (Ante, p. 145.) 



8. X. irapressus Eichh. Berl. Ent. Zeitschr. 1867, 400.— Georgia. 



9. X. xylographus.=5o.s<ricAMS xylogr. Say ; X.pini Eichh. Berl. Ent. Zeitschr. 

 1867, 401. (Ante, p. 145.) 



10. X. pubescens Zimm. (Ante, p. 145.) 



11. X. planicoUis Zimm. (Ante, p. 145.) 



h. — Tibia? coarsely serrate. 



12. X. caelatus.=Tb»iicws coclatus Eichh. Berl. Ent. Zeitschr. 1867, 402. (Ante, 

 p. I4i;.) 



The circularly annulate portion of the club of the antenna3 is 

 larger than in the other species, (except X. sparsus and plagiatus,') 

 and the smooth basal part correspondingly smaller, showing therefore 

 the same tendency towards Tomicus mentioned below. 



c. — Tibiae with only a few small teeth, anterior pair narrower than 



the others. 



rS. X. sparsus. — Elongate cylindrical, blackish-brown, shining, sparsely 

 clothed with very long erect hairs; antennse and feet dark ferruginous; head 

 densely pilose, with long yellow hair, prothorax a little longer than wide, 

 coarsely asperate in front, coarsely and sparsely punctured behind, with an 

 elongated, smooth dorsal space; anterior margin fringed with hairs which are 

 half as long as the thorax; elytra with>T0Ws of distant coarse punctures, inter- 

 vals with more distant but equally coarse punctures, so that at first sight the 

 punctuation appears confused; tip obliquely declivous, impunctured, except in 

 the subsutural furrow, which is well marked, face of the declivity each side 

 with two large acute tubercles, and a third smaller one at the upper edge of the 

 slope, margin of the slope with a few (three or four) small denticles; extreme 

 tip slightly produced into an acute jjoint. Long. 2 mm. 



Que specimen from Point Kewenaw, Lake Superior. The tibiae in 



