304 MISC. PUBLICATION 657, U. S. DEPT. OF AGRICULTURE 
KEY TO INSECT INJURIES BY SCOLYTIDAE AND PLATYPODIDAE—Continued 
2s Breeding in slash by choice but also breeding in decadent and . 
weakened branches amd (bop se 2 ae ee 13 
Breeding by preference in slowly dying, shaded-out limbs, less 
commonly inislashs 2.26 e ee oe ey ee 15 
13. In smooth, thin bark of white pine, less common in other pines: . 
Pityogenes hopkinsi Sw., p. 330. Pityogenes lecontei Sw., p. 330. | 
Ips pint Say, p. 335. Pityophthorus cariniceps Lec., p. 332. . 
In rougher bark of pine}s) asia ee 14 
14. In southern pines: 
Ips grandicollis Eichh., p. 334. Ips avulsus Eichh., p. 335. 
Pityogenes plagiatus Lec., p. 380. Pityophthorus pulchellus 
Eichh., p. 332. Pityophthorus pullus Zimm., p. 3382. 
In northern pines: 
Ips grandicollis Eichh., p. 334. Ips pini Say, p. 335. 
15. Found only in southern pines: 
Pityogenes meridianus Blkm., p. 330. Pityoborus comatus 
Zimm., p. 330. 
Found most commonly in white pine but also in others, including 
southern pines: 
Pityophthorus consimilis Lec., p. 333. Pityophthorus nudus | 
Day [Oo Bees i, 
6: Found in medium-sized branches of spruce: | 
In longitudinal forked burrows 
Scolytus piceae Sw., p. 318. 7 
In radiate burrows___ Polygraphus rufipennis Kby., p. 313. il 
In transverse forked burrows 
Phthorophloeus piceae Sw., p. 315. 
In irregular radiate burrows; larger 
Dryocoetes americanus Hopk., p. 336. 
In irregular radiate burrows; smaller | 
Dryocoetes piceae Hopk., p. 336. | 
Found in the smaller branches of spruce: 
Cryphalus mainensis Blkm., p. 329. Pityophthorus cascoensis 
Blkm., p. 3382. P. shepardi Blkm., P. tonsus Blkm., p. 332. 
P, pulchellus Eichh., P. consimilis Lec., p. 3382. P. nudus Sw., 
p. 333. 
We neigh the twigs of pines. (902 2a eee 18 
Attacking the twigs of spruce: 
Various species of Pityophthorus, p. 331. Cryphalus spp., p. 329. 
Attacking the twigs of larch_______~_ Pityophthorus spp., p. 331. 
Attacking the twigs of balsam fir: 
Pityophthorus spp., p. 3381. Cryphalus spp., p. 329. 
Attacking the twigs of juniper, arborvitae, cypress, etc.; young 
adults eating out the bases of twigs causing them to wilt or to 
break: offs Baw so etn eae eee aes Phloeosinus spp., p- 321. 
18. Attacking living pine twigs, boring through the bark and wood to 
the pith: 
Inereds pines: ay tats oem Myeloborus fivazt Blkm., p. 331. 
Inewhite pines =.= ssuen Myeloborus ramiperda Sw., p. 331. 
In various pines____ Pityophthorus pulicarius Zimm., p. 331. 
Attacking the twigs of decadent or severed branches; breeding 
principally in the inner bark but often affecting the wood: 
Carphoborus bicristatus Chap., p. 314. 
Carphoborus bifurcus Eichh., p. 314. 
Pityophthorus spp., p. 331. 
19. Small brown to black beetles causing the death of growing pine 
cones: 
Destroying white pine cones 
Conophthorus coniperda (Sz.), p. 328. 
Destroying red pine cones 
Conophthorus resinosae Hopk., p. 328. 
Affecting cones of loblolly pine 
Conophthorus taedae Hopk., p. 328. 
Affecting cones of Virginia pine 
Conophthorus virginianae Hopk., p. 328. 
