20. 
21. 
22. 
INSECT ENEMIES OF EASTERN FORESTS 
KEY TO INSECT INJURIES BY SCOLYTIDAE AND PLATYPODIDAE—Continued 
Attacking the bark of the main trunk and larger branches of hard- 
WOCUE tLe ecmme apenas st Seek ener LS st Pee ey A eee 
Attacking the smaller limbs and twigs of hardwood trees_________ 
Entering the bark of the trunk and larger branches of living 
hickory; forming centipedelike engravings on the inner bark, 
killing the trees. Young adults injuring the small twigs in 
LECCITN Ge eee es ae ee Scolytus quadrispinosus Say, p. 308. 
Breeding in the inner bark of decadent or felled elms; not killing 
Beery trees but dangerous as vectors of Dutch elm disease 
aking short, simple, longitudinal egg galleries; young 
adults injuring small twigs in feeding: 
Scolytus multistriatus (Marsh), p. 310. 
Scolytus sulcatus Lee., p. 312. 
_ Making branched, tranverse burrows; young adults. often 
hibernating in bark of healthy elms 
Hylurgopinus rufipes Eichh., p. 323. 
Breeding in the inner bark of decadent and felled ash; making 
regular, transverse, branched engravings: 
Leperisinus aculeatus Say, p. 323. 
Leperisinus fasciatus Lee., p. 323. 
Breeding in the trunk and larger branches of decadent or felled 
birch, beech, red gum, and wild cherry; in irregular radiate 
burrows in the inner bark 
Dryocoetes betulae Hopk., p. 336. 
Engraving the inner bark and sapwood of decadent and felled mul- 
berry with regular, transverse, branched engravings; adults 
hibernating in inner bark of living trees, injuring them 
Phthorophloeus frontalts Zimm., p. 315. 
Breeding in the inner bark of injured wild plum and wild cherry: 
In short, unbranched, longitudinal galleries: 
Scolytus ,ugulosus Ratz., p. 310. 
In forked, tranverse burrows: 
Phthorophloeus liminaris Harr., p. 315. 
Phthorophloeus mississippiensis Blkm. p. 315. 
Breeding in the thin bark of the trunks of sumac;. making radiate 
burrows: 
Pityophthorus rhois Sw., p. 331. 
Pityophthorus crinatis Blkm., p. 331. 
Pityophthorus scriptor Blkm., p. 331. 
Breeding in the smaller limbs and twigs of hickory: 
Making short, unbranched burrows in the smaller limbs 
Chramesus hicoriae Lee., p. 314. 
Making very slender, branched longitudinal burrows in 
hickory twigs_-__-__- Cryptocleptes dislocatus Blkm., p. 326. 
Young beetles causing injury to green twigs and leaf petioles 
of hickory by feeding, causing them to wilt or break 
Scolytus quadrispinosus Say, p. 308. 
Breeding in the small branches of hackberry 
In unbranched, longitudinal burrows: 
Scolytus muticus Say, p. 310. 
Chramesus chapuisii Lec., p. 314. 
In transverse branched burrows 
Phthorophloeus dentifrons Blkm., p. 315. 
Breeding in the small branches of oaks and chestnut: 
Pseudothysanoes lecontet Blkm., p. 326. 
Pseudopityophthorus spp., p. 327. 
Breeding in the small branches of basswood: 
Pseudothysanoes rigidus Lee., p. 326. 
Pseudothysanoes drakevi Blkm., p. 326. 
Breeding in the small branches of redbud 
Pityophthorus natalis Blkm., p. 331. 
Breeding in the small branches of red gum 
Pityophthorus liquidambarus Blkm., p. 331. 
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