588 FAMILY IV. SCOLYTIM3. 



thighs stout; tibiae rather broad and compressed, the front pair 

 not serrate on the outer edge, their outer apical angle armed with 

 a long curved hook ; middle and hind tibije with outer margins 

 feebly serrate, their tips truncate and armed with two spines at 

 outer angle. (Figs. 142 and 130 K.) 



KEY TO SPECIES OF SCOLYTUS. 



a. Elytra with distinct strise of close-set punctures. 

 &. Strise deep; interspaces narrow with single rows of fine punctures 



bearing short hairs. 



c. Abdomen af male with several spines. 909. QUADRISPINOSUS. 



cc. Abdomen of male with a single blunt, slender spine, that of fe- 

 male much shorter and conical. 910. PICE^:. 

 1)1). Strias less deep; interspaces wider with single rows of fine punc- 

 tures; abdomen of both sexes without spines, coarsely punctured. 



911. FACT. 

 act. Elytra with numerous rows of punctures. 



d. Elytra clothed with long, fine, erect hairs. 912. MUTICUS. 



dd. Elytra nearly glabrous. 



e. Size larger, 3.7 mm. 913. SULCATUS. 



ee. Size smaller, 2.5 mm. 914. RUGULOSUS. 



8. multistriatus Marsh, also mentioned by Felt (1905), is an imported 

 elm bark borer, received from J. W. Chapman, Dorchester, Mass., who found 

 it October 5, 1912, in adult and larval stages. 



909 (9144). SCOLYTUS QUADRISPIA T OSTTS Say, 1824, 323; ibid, II, 182. 



Male, head flat, longitudinally finely aciculate, fringed with long 



curled hairs. Anterior part of ventral de- 

 clivity very deeply concave, its margin 

 acute, subsinuate and more or less angu- 

 lated at middle; concave face of second 

 segment more or less carinate, and nearly 

 smooth, its lateral angles slightly pro- 

 duced into short spines; third segment 

 with three spines, which are sometimes 

 very long, sometimes short; fourth seg- 

 ment concave, rounded and strongly mar- 

 Fig. 143. Beetle 7 , and side g} ne d behind, sparsely punctured, and 



view of posterior extremity of male. 



(After Felt.) " with a more or less distinct tubercle at mid- 



dle of hind margin; fifth segment very short and retracted, visible only 

 from behind. Female, head less flattened, punctured at sides, aciculate 

 only at middle, thinly clothed with long hair. Anterior face of ventral 

 declivity flattened, margined, nearly perpendicular, sparsely punctured; 

 remaining segments flat, strongly punctured; fifth rounded behind, as 

 long as the third and fourth united. Length 4 5 mm. (Fig. 143.) 



Putnam, Marion and Posey counties, Tnd. ; June 12 Dec. 21. 

 Ranges from Quebec and New York to Georgia and Missouri. 

 This is the "hickory bark borer," a very destructive enemy of 

 bitter-nut, shell-bark and pig-nut hickory and probably pecan. 



