2.2 to 2.8 mm. long. The elytral declivity of the female is steep, 
opaque, finely granulate, and marked by rather large striae punc- 
tures. Galleries run obliquely across the grain of the wood at 
depths of an inch or more (fig. 101). Eventually they branch and 
the arms follow the grain. 
Other eastern members of the genus and their hosts are as 
follows: Xyleborus pint Eichh.—probably occurs in various hard- 
woods and conifers; X. howardi Hopk.—pines; X. cavipennis 
(Eichh.)—recorded from Rhizophora in southern Florida; X. 
obliquus (LeC.)—birech, hickory, and chestnut; X. rubricollis 
Eichh.—oak; X. lecontet (Hopkins)—hickory and palm in Flo- 
rida; X. tachygraphus Zimm.—wide variety of deciduous trees; 
X. obesus LeC.—wide variety of deciduous trees; X. sayz (Hop- 
kins)—wide variety of deciduous trees; X. dispar (Fab.)—wide 
variety deciduous trees and certain conifers; X. volvulus (Fab.) 
—probably various deciduous trees and shrubs in southern Flo- 
rida; and X. pecanis Hopk.—various hardwoods in Sauthern 
States. 
Xylosandrus zimmermant (Hopk.), an introduced species, has 
been recorded in southern Florida. Its hosts are listed as Ardisia 
sp., Ocotea catesbyana, and probably Chrysobalanus. X. germanus 
(Blandford), also an introduced species, breeds in the branches, 
logs, and stumps of elms in areas surrounding New York City 
and in the Ohio River Valley. It also attacks many other species 
of hardwoods. Heavy infestations have been found in elms killed 
COURTESY OF DUKE UNIV. SCH. OF FOREST. 
FIGURE 101.—Tunnels of the ambrosia beetle, Xyleborus xylographus, 
in the wood of a shortleaf pine. 
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