LeConte.] 



SCOLYTINI. 371 



SCOLYTUS Oliv. 



The name of this genus was first proposed by Geoffroy in 1763 ; but for 

 reasons wliich I have given in detail elsewliere,* I prefer citing Olivier, 

 1789, for its first proper use in Zoology, f 



Elytra with distinct stri« of close set punctures. ... 2. 



Elytra with numerous rows of punctures 3. 



2. Strise deep, interspaces narrow with single rows 



of fine punctures bearing short hairs ; (abdo- 

 men of (^ with several spines) 1. quadrispinosus. 



Striae less deep, interspaces wider, with single 



rows of fine punctures ; (abdomen of both 



sexes without spines, coarsely punctured) .... 2. fagi. 



Striae hardly impressed, interspaces wide, with 



single rows of fine punctures ; (abdomen (j^ 



with one spine at the middle near the basej . . 3. unispinosus. 

 Strife hardly impressed, interspaces wide towards 



the suture with confused small punctures ; 



(abdomen finely punctured, third and fourth 



ventral segments with very small tubercles at 



the hind margin) 4. californicus. 



3. Elytra nearly glabrous 4. 



Elytra clothed with long fine erect hairs 5. muticus. 



4. Abdomen sparsely punctured 5. 



Abdomen densely punctured, anterior face of de- 

 clivity large, perpendicular, margined 6. prseeeps. 



5. Punctures of elytra not larger towards the base.. 6. 

 Punctures of elytra larger and somewhat scabrous 



towards the base 7. subscaber. 



6. Second ventral segment not tuberculate 8. sulcatus. 



Second ventral segment with a small apical 



tubercle 9. ventralis. 



1. S. quadrispinosus Say, Journ. Ac. Nat. Sc. Phila. iii, 333, (cJ*); 

 ed. Lee, ii, 183; Lee, Tr. Am. Ent. Soc. 1868, 165; S. carym Riley, Prairie 

 Farmer, Febr. 1867; Walsh, Practical Entomologist, ii, 58; Lee, Tr. Am. 

 Ent. Soc. (9) 1868, 166; Riley, Noxious Ins. Missouri, (1873) v, 103, 

 (d^, '^); S. mw^icits t Cliapuis, (nee Say,) Mem. Soc.Roy. Sc. Liege, 1869. 



^. Head flat, longitudinally finely aciculate, fringed with long curled 

 hairs; anterior part of ventral declivity very deeply concave; the margin. 

 is acute, subsinuate and more or less angulated at the middle; the concave 

 face of the second segment is more or less carinate, and nearly smooth; the- 



* On some changes in the nomenclature of North American Coloeoptera, 

 which have been recently proposed. Canadian Entomologist, 1874, p. 185. 



t The table of species in my memoir (Trans. Am. Ent. Soc. 1868, 165,) needs 

 some modification on account of the discovery of additional species, and the^ 

 sexual characters of some of those already described. 



