352 SCOLYTID.i:. [LeConte. 



5. Elytra strong!}' punctured in approximate rows 6. 



" strongly and confusedly punctured 10. carinicepr. 



Elytra finely and confusedly punctured 11. fossifrone. 



6. Larger and stouter, rows of punctures confused to- 



Avards the suture 12. confinis. 



Smaller and more slender, rows regular approximate 13. nitidulus. 



Much smaller, rows more distant, asperities of pro- 

 thorax not concentric 14. puncticollis. 



Much smaller, rows stronger, asperities of prothorax 



concentric 15. lautus. 



7. Eh'tra punctured in rows 8. 



' ' confusedly pianctured, hairs erect 16. puberulus. 



8. Rows of punctures irregular, approxima'e 17. digestus 



" " fine and distant; prothorax with 



an oval patch of d„'nse hair each side 18. comatus. 



7. p. carinulatus. Cryphalus car. Lcc, Trans. Am. Ent. Soc. 1874, 70. 

 California, extending as far South as theMojave region. The pubescence 



is long and erect, and the eyes are not eraarginate. The dorsal line of the 

 prothorax is narrow, smooth and dis'inctly elevated. Length 2-3 mm.; 

 .08-. 12 inch. 



(5^. Seven specimens agree in having the head dull, densely punctured, 

 with a very large and deep excavation; the general surface of the head is 

 thinly^ clothed with erect pubescence, but the anterior margin of the front, 

 above the mandibles, is fringed with long, yellow prostrate hair. 



9 ?• One specimen differs in having the head more convex, less densely 

 punctured, the excavation much smaller and less deep, with a distinct lon- 

 gitudinal elevation at the middle. The cusps of the declivity of the elytra 

 are less prominent, and I am therefore in doubt if it should be referred to 

 this species. 



8. P. pullus. Cryj^furgvsXpullun Z\mm., Trans. Am. Ent. Soc. 1868, 143; 

 ? P. bisulcatus Eichhoff, Bcrl. Ent. Zei.schr. 1868, 274. 



(J'. Head strongly punctured, rather flat, broadly but slightly concave in 

 front. 



9. Head strongly punctured, uniformly convex, with a slight callus on 

 the front. 



Middle States. The declivity of the elytra is almrst without cusps, and 

 is slightly more refuse in the 9 than in the (^, but the suture is strongly 

 elevated in both. Length 2.3 mm. ; .09 inch. 



P. pulchellus Eichhoff, 1. c. 275. seems to Ijc closelj' allied to this 

 species, and to differ chiefl}' by the prothorax strongly, rugosely punctured 

 behind, and the suture less elevated. If the locality be California, then it 

 may possibl}^ be P. puncticollis, but until the species of this avitlior are de- 

 scribed with some reference to allied species, or synoptic tables prepared, 

 they cannot be satisfactorily identified. 



