634 FAMILY IV. SCOLYTID.E. 



into four parts. Head of male finely punctured, opaque, with two very 

 deep excavations, extending almost to the front margin, and separated by 

 a narrow, elevated longitudinal carina; eyes deeply and narrowly emar- 

 ginate. Thorax longer than wide, anterior half densely asperate, separated 

 from posterior half by a shallow transverse impression, posterior half shin- 

 ing, distinctly but not densely punctured, smooth dorsal line not elevated, 

 base distinctly margined. Elytra and declivity as described in key; suture 

 slightly impressed and marked with a row of punctures as far as declivity, 

 where it becomes smooth and deeply impressed, concavity smooth, broader 

 at tip; tibiae with two or three feeble teeth toward tip. Length 2.5 mm. 



Michigan, Ontario, Pennsylvania. Western Maine to West 

 Virginia in terminal twigs of spruce, excavating many short, 

 radiating, curved galleries from a large central chamber in the 

 bark and surface of the wood of twigs and branches of dying trees, 

 and main stem of young dying red spruce. (Hopkins.) Evi- 

 dently a northern species and thus far quite rare; at Ithaca, N. 

 Y, under bark of small twigs of white pine, P. strolnis; Aug. 21 

 and October. (Chittenden.) 



1021 ( ). PITYOPHTHORUS coxiPERDA Schwarz, 1895, 144. 



Cylindrical, less elongate. Shining, sparsely beset with rather long, 

 erect and serrate hairs; black, mouth parts, antennae and tarsi reddish- 

 testaceous, tibiae often reddish. Antennal scape straight, gradually thick- 

 ened apically, funicle 5-jointed, club large, ovate, on both sides shining 

 and sparsely pubescent, fringed with moderately long hairs, sutures nearly 

 straight, dividing it into three nearly equal parts. Head very shining, 

 with but a few hairs in both sexes; eyes large, acutely emarginate in 

 front. Thorax almost as wide as long, narrowed apically, anterior half 

 tuberculate, posterior half densely punctured, more densely hairy than 

 head. Elytra with sparse, long, erect pubescence; first and second inter- 

 vals very sparsely, uniseriately punctured, the others with regular series 

 of punctures; declivity moderately steep, not sulcate, traversed by a fine, 

 elevated subsutural stria, which is either crenulate or slightly tubercu- 

 late, and limited externally by a tuberculated ridge which is the continua- 

 tion of the second interval. Male, head smooth, except scattered punctures 

 near the eyes, and with a flattened tubercle on the clypeal margin, which 

 is continued posteriorly as a feeble ridge. Female, head with small scat- 

 tered punctures which become stronger and denser at sides. Length 2.7 

 3.3 mm. 



Canada, Michigan, Massachusetts, Virginia, New York, Penn- 

 sylvania ; June, July, November. Develops within the cones of 

 pine trees. Synonymous with this species appears to be Dryo- 

 coetes sp. Hamilton,* which breeds in cones of Pinus strobus, 

 which normally grow to a length of six or seven inches; eggs 

 probably deposited in young cones which, from impaired vitality, 

 drop when three or four inches long, full grown larvae found in 

 July ; adults found Sept. 10. 



*Can. Ent. XXV, 1893, 279. 



