10. 
1 aU 
230 
the egg gallery of irregular elongate type, extending 
downward ‘from entrances 22) ee eee 
In older stumps or the bases and roots of dying trees; 
preferring fermenting bark 
Hylastes spp., Hylurgops pinifex 
Beetles reddish brown, 5 to 9 mm. long; common in all 
parts of the United States 22. == Dendroctonus valens 
Beetles nearly black, slightly smaller; Southern States, 
rarer ins Northeast 2+). Dendroctonus terebrans 
In:thicker:bark of pines* =o 4-2 - ee ie 
In: thicker bark°of spruces7. =) -6e- = ee oe 
In thicker bark of standing and felled balsam fir; burrows 
radiate; beetle reddish brown, 2.5 mm. long 
Pityokteines sparsus 
In thicker bark of decadent and felled juniper, arborvitae, 
cypress, etc.; also causing injury by feeding on the 
twigs: 
Arborvitae, Northeastern States 
Phloeosinus canadensis 
Juniper, Eastern and Southern States 
Phloeosinus dentatus 
Cypress, Southern States .............. Phloeosinus taxodiu 
Brown to black beetles about 3.6 mm. long. In healthy 
southern pines; S-shaped egg galleries in the inner bark 
Dendroctonus frontalis 
Reddish brown to black beetles, 3.5 to 6.5 mm. long; some- 
times in smaller trees or the tops of larger trees, but 
usually in dying or cut trees; burrows radiate 
Ips calligraphus 
Ips grandicollis, Ips pint 
Beetles 3 to 6.5 mm. long, reddish brown to black ; in 
radiate burrows in the inner bark of trunks of dying or 
CU pINeSs =e. Ips longidens, Orthotomicus caelatus 
Brown to black beetles, 5 to 6 mm. long; longitudinal egg 
galleries in mature, living spruce....Dendroctonus obesus 
Reddish brown to black beetles, 2 to 4 mm. long; in radi- 
ate or forked burrows in the bark of the trunk or 
larger limbs of dying or cut spruce «. 4. : 
Beetles shining black, 3 mm. long; forked burrows 
Scolytus piceae 
Beetles dull black or brown, 2.4 mm. long; burrows 
radiater =. Polygraphus rufipennis 
Beetles reddish brown, 3 mm. . long; 3 teeth each side at 
rear end; radiate burrows “ Orthotomicus caelatus 
Dark reddish-brown beetles, 3.5 to 5 mm. long; straight 
or wavy egg galleries in the bark of living, felled, or 
decadent larch trees _.... Dendroctonus simplex 
Small bark beetles in decadent or felled larch 
Scolytus piceae, Polygraphus rufipennis 
Orthotomicus caelatus 
In medium to small branches of pine . 
In branches of spruce 
In branches of larch 
Scolytus piceae, Polygraphus rufipennis 
12 
16 
