10. 
Le 
INSECT ENEMIES OF EASTERN FORESTS 
KEY TO INSECT INJURIES BY SCOLYTIDAE AND PLATYPODIDAE—Continued 
Phloeosinus canadensis Sw., p. 321. 
On juniper, Eastern and Southern States 
Phloeosinus dentatus Lec., p. 321. 
On cypress, Southern States__Phloeosinus taxodii Blkm., p. 321. 
Brown to black beetles about 3.6 mm. long, killing healthy southern 
pines by making S-shaped egg galleries in the inner bark 
Dendroctonus frontalis Zimm., p. 315. 
Reddish brown to black beetles, 3.5 to 6.5 mm. long, sometimes 
killing smaller trees or the tops of larger trees, but usually breed- 
ing in dying or cut trees; burrows radiate: 
Ips calligraphus Germ., p. 334 
Ips grandicollis Eichh., p. 334 
Ips pint Say, p. 335 
Ips chagnoni Sw., p. 335 
Beetles 3 to 6.5 mm. long, reddish brown to black; in radiate 
burrows in the inner bark of trunks of dying or cut pines; rarely 
or never killing healthy trees; burrows radiate: 
; Ips longidens Sw., p. 335 
Orthotomicus caelatus Eichh., p. 335 
Dryocoetes americanus Hopk., p. 336 
Brown to black beetles, 5 to 6 mm. long, making longitudinal egg 
galleries in mature, living spruce and killing the trees 
Dendroctonus piceaperda Hopk., p. 318 
Reddish brown to black beetles, 2 to 4 mm. long, making radiate or 
forked burrows in the bark of the trunk or larger limbs of dying 
OLRICULES RU CCn ete eae ee ee ee See ey ee 
Beetles shining black, 3 mm. long; forked burrows 
Scolytus piceae Sw., p. 313 
Beetles reddish brown, 4 mm. long; radiate burrows 
Dryocoetes americanus Hopk., p. 336 
Beetles reddish brown, 2.5 mm. long; radiate burrows 
Dryocoetes piceae Hopk., p. 336 
Beetles dull black or brown, 2.4 mm. long; burrows radiate, the 
4-eyed dark beetle________-_ Polygraphus rufipennis Kby., p. 313 
Beetles dull brown, 2.2 mm. long; eyes normal; burrows radiate 
Xylechinus americanus Blkm., p. 321 
Beetles reddish brown, 8 mm. long; 3 teeth each side at rear end; 
LAGCAceHDUTEOWS 2. 2 Orthotomicus caelatus Eichh., p. 335 
Dark reddish-brown beetles, 3.5 to 5 mm. long; making straight or 
wavy egg galleries in the bark of living, felled, or decadent larch 
TREC Seren ee = Be oe Dendroctonus simplex Lec., p. 319 
Scolytus piceae Sw., p. 313 
Polygraphus rufipennis Kby., p. 313 
Orthotomicus caelatus Eichh., p. 335 
Dryocoetes americanus Hopk., p. 336 
Attacking the medium to small branches of pine______-________- 
Aitackines he branches Of spbUCese 29s ee See ee ee 
Attacking the branches of larch: 
Scolytus piceae Sw., p. 313 
Polygraphus rufipennis Kby., p. 313 
Attacking the branches of balsam fir: 
Pityokteines sparsus Lec., p. 336 
Cryphalus balsameus Hopk., p. 329 
192440°—_49——_2.0 
303 
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