456 



WEST VIRGINIA EXPERIMENT STATION 



Cymatodera inornata, 437. 

 D 



Dakruma coccidivora, 426, 451- 

 Davis, Hon. H. G., 228. 

 Decatomidea polygraph!, 429. 

 Dendroctonus, genus of, 392. 

 Dendroctonus frontalis, 245, 283, 

 284, 286, 289, 290, 291, 293, 294, 

 296, 298, 301, 320, 327, 344, 346, 

 350, 394, 426, 429, 448. 

 Bibliography, 395. 

 Characteristic features 



of injury of, 413. 

 Cause of death of, 470. 

 Description of, 394, 

 eggs, larva and 

 pupa, 396. 

 Distribution of, 407. 

 enemies, Predaceous 

 and parasitic of, 

 378. 



Friendly elements,411. 

 Galleries of. 397. 

 Brood exits, 400. 

 Hibernating, 400. 

 Egg cavaties, 400. 

 Larval mines, 400. 

 Main Entrance, 397. 

 Nuptial chambers,399. 

 Preliminary, 397. 

 Primary, secondary 



and brood, 399. 

 Pupa cases, 400. 

 Habits of, 403. 

 Habit of flight of, 406. 

 Host plants of, 407. 

 Life history, 401. 

 Natural enemies, 408. 

 Birds, 410, 

 Diseases, climatic 

 conditions, etc., 

 411. 



Parasitic, 408. 

 Predaceous, 409. 

 Robbers, 410. 

 Remedies and preven- 



tatives, 412. 



Dendroctonus rufipennis, 349, 393- 



simplex, 394,434,447- 



terebrans, 284, 294, 



296, 333, 342, 344, 



347, 392, 415. 447. 



Character of injury of, 



419. 

 Description, 415. 



D. terebrans Continued. 



Adult, 392, 515, 

 Egg, 515. 

 Larva. 515. 

 Pupa, 416. 



Habits and life his- 

 tory of, 416. 

 Kinds of trees attack- 

 ed by, 420. 



Natural enemies, 420. 

 Destructive bark beetles, 392. 

 Destructive pine bark beetle, (Den- 

 droctonus frontalis) 237, 239, 

 245. 



All examples of, dead, 431. 

 Destructive spruce bark beetles, 

 (Polygraphus rufipennis), 235, 

 246. 



Abundance of, and its 



economic relations 



to the spruce, 250. 



Distribution, 249. 



Imported enemy of, 



251, 



Method of combatting 



and preventing 



future loss by, 250. 



Natural enemies of, 



251. 

 Previous knowledge of 



habits of, 249. 

 Trees infested by, 249. 

 Destructive scolytids and their im- 

 ported enemy , 353. 

 Destructive sapwood borers, 242. 

 spruce wood miner, 250. 

 Destruction of timber by snow and 



wind, 309. 

 Destruction. Total, of pine and 



spruce threatened, 296. 

 Dicerca punctulata, 436. 

 Diomorus zabriskii, 429. 

 Diplosis pini-rigidae, 451. 

 Diseases of insect enemies of the 



spruce, 268. 

 Dobbins, Judge, 230. 

 Don, Dr. C. A., 301. 

 Dromius quadricollis, 432. 

 Dryocoetes autographus, 252, 316, 

 346, 427, 433,^445- 



granicollis, 251, 346, 445- 

 Dryophanta gemmula, 426. 



E 



Elaterid larva, 436. 



