29. 
30. 
31. 
32. 
33. 
34, 
INSECT ENEMIES OF EASTERN FORESTS 
In stained ambrosial burrows, in both sapwood and heartwood; 
beetles longer, slender, cylindrical, with wide heads flat in front; 
the wing covers of the males with spinelike projections behind; 
INECOMMETS EAN GeNAanGWOOGSee =a m ames sean epee ee een 
In the wood of broadleaved trees; the burrows of various types__- 
Compound ambrosial burrows in the wood of decadent or felled 
COMME PS eeh Fe SHE iy 3. ai oa al ee uae coe Lael er oes 
Breeding in living broadleaved trees, not killing them but affecting 
the value of the wood; compound burrows in tulip, maple, 
ORIGMETCH eee Be Corthylus columbianus Hopk., pp. 301, 338. 
_ Breeding in dying or dead broadleaved trees, especially in recently 
AUT pita Gl] Y=) kee ear Sense a apes OD comers ic Rat Ne Be Te eee ie oe Seem 
Constructing simple, unbranched, ambrosial burrows (see page 299 
for description) in various hardwoods. 
~ In sapwood of various hardwoods, such as elm, maple, 
hickory, birch, ete.; beetles 2 mm. or less in length; 
Europe and eastern part of the United States 
Xyleborus saxesent Ratz., p. 340. 
In southern hardwoods, especially in pecan, hickories, birch, 
-sweet gum, etc.; beetle very similar to above, Southeastern 
St atesweas cw weenie Xyleborus pecanis Hopk., p. 340. 
Constructing branched ambrosial burrows (see p. 229 for descrip- 
TOM) iMeVATI OUST TAG WOO Sine ee ge eee ee 
Constructing compound ambrosial burrows (see p. 229 for descrip- 
TIO) RIN EVATAOUS aT: Cliv@ OCS wy eee ee es ees ee SU Vine 
In branched ambrosial burrows in the sapwood of dying and 
recently dead hickories; cylindrical beetles 4 mm. or more in 
Leni gt hehe Ge ene ee Sees X yleborus celsus Eichh., p. 341. 
In branched ambrosial burrows in the sapwood of various species of 
dying and dead hardwoods; beetles from 1 to 4 mm. long: 
In beech, birch, maple, oak, etc.; Northeastern States 
Anisandrus obesus Lee., p. 341. 
In branches of apple, maple, ete.; Eastern States 
Anisandrus pyri Peck, p. 341. 
In small branches and twigs of maples and beech; North- 
eastern States___________ Anisandrus minor Sw., p. 341. 
Attacking stumps and logs of hardwoods in New Jersey, 
New York, Connecticut, and the upper Ohio Valley; 
introduced from the Orient 
Xylosandrus germanus Bldfd., p. 341. 
In narrow black-stained burrows in various hardwoods; beetles 
SOA ea LS) Ey AG Ce ate we a Pa ae la Oe a pea ey aed atia baie re ee 
In notably coarser, black-stained burrows in hardwoods; beetles 
larger and much stouter: 
In birch, beech, maple, etc.; beetle brown to black in color 
> Xyloterinus politus Say, p. 339. 
In poplars; Northeastern States; beetle with smoky yellow 
stripe on each wing cover 
Trypodendron retusus Lec., p. 339. 
In various birches; Northeastern States; stripe of yellow on 
each wing cover _---_-_- Trypodendron betulae Sw., p. 339. 
Beetles very slender, more than 3 times as long as wide; antennal 
funicle 2-jointed: 
Beetle reddish brown, wing covers all one color; smaller; in 
many hardwoods__--_--- Monarthrum mali Fitch, p. 339. 
Beetle dark brown, wing covers with cross band of yellow; 
larger; infests many southern hardwoods 
Monarthrum fasciatum Say, p. 339. 
Beetles less than 3 times as long as wide; antennal funicle 5-jointed; 
in various hardwoods: 
Xyleborus affinis Eichh., p. 340. 
Xyleborus xcylographus Say, p. 340. 
Xyleborus fuscatus Eichh., p. 340. 
Xyleborus confusus Eichh., p. 341. 
307 
KEY TO INSECT INJURIES BY SCOLYTIDAE AND PLATYPODIDAE—Continued 
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