372 SCOLYTID^. 



[LeCoiite. 



lateral angles ar3 slightly produced into short spines; the next segment has 

 three spines, which are sometimes very long, sometimes short; the fourth 

 segment is concave, rounded and strongly margined behind, sparsely punc- 

 tured, and has a more or less distinct tubercle at the middle of the hind 

 margin; the fifth segmsnt is very short, and retracted, visible only from 

 behind. 



9- Head less flattened, punctured at the sides, aciculate only at the mid- 

 dle, thinly clothed with long hair; anterior face of ventral declivity flat- 

 ten 'id, margined, nearly perpendicular, sparsely punctured; remaining seg- 

 ments flat, strongly punctured; fifth rounded behind, as long as the third and 

 fourth united. 



New York, Georgia, Kansas, Missouri; for an excellent series bred from 

 hickory trees, I am indebted to Mr. Riley. Length 4-5 mm. ; .16 -.20 inch. 



2. S. fagi "Walsh, Practical Entomologist, ii, 58, (J*, ?); Lee, Tr. Am. 

 Ent. Soc. 1868, 166. 



(^. Head flattened, punctured, densely clothed with long erect hairs; 

 ventral surface strongly punctured, more sparsely in front; declivity mar- 

 gined, nearly perpendicular; fifth segment as long as the third and fourth 

 longitudinally impressed. 



9. Head more convex, less hairy; the ventral segments more strongly 

 punctured. 



Illinois, one pair. Length 5.5 mm.; .33 inch. Depredates upon beech 

 trees, according to Mr. Walsh. 



3. S. unispinosus, n. sp. 



Cylindrical, shining black, head aciculate, thinly clothed with long erect 

 hairs. Pr^thorax a little longer than wide, sides rounded and feebly con- 

 stricted in front, finely and not densely punctured. Elytra with feebly im- 

 pressed striae composed of small punclures; interspaces with single rows of 

 much smaller punctures. Ventral declivity feebly punctured; anterior 

 edge somewhat prominent, but obtuse at the middle; a long obtuse spine 

 projects from the middle of the nearly perpendicular face; fifth segment 

 hardly longer than the fourth, concave, rounded and strongly margined 

 behind. Length 3.3-3.7 mm.; .09-. 13 inch. 



Two specimens, Oregon. The head is more flattened in one than in the 

 other, but I observe no other indication of sexual diff"erence. The antennte 

 are ferruginous, and the tarsi brown, as in the other species of the genus. 



4. S. californicus Lee, Tr. Am. Ent. So3. 1868, 166. 



One (^, California; Mr. A. Murray. Length 4.5 mm.; .18 inch. 



5. S. muticus Say, Journ. Ac. Nat. Sc. Phila. iii, 333; ed. Lee, ii, 183; 

 Lee, Tr. Am. Ent. Soc. 1868, 166. 



Pennsylvania, one (^. Easily known by the elytra with numerous rows 

 of strong, but distant punctures, which bear long, erect, soft hairs. Head 

 flat, finely aciculate, sparsely fringed with long hair. Ventral surface 

 sparsely punctured; declivity oblique, margined; fifth segment triangularly 



