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APPENDIX. 
THE LOMBARDY POPLAR BORER. 
(Agrilus granulatus, Say.) 
Order COLEOPTEJRA. Family Buprestid2E. 
By Prof. T. J. Burrill. 
A is known by every one that the Lombardy poplar lives but a 
)rt time in the rich soils of the Mississippi valley, where its growth 
i exceedingly rapid. Many suppose that this is due to some degen- 
:dion, through the processes of propagation or otherwise, of the 
astitutional vitality of the tree,.—that it is inherently short-lived. 
After some studies upon this subject, I am quite sure, that the early 
ith of the tree comes from other causes, and is due to agencies 
;side the tree itself and not specially connected with the soil 
5 climate. For the present note, one of these, and only one, may 
mentioned. 
About the middle of June a small beetle ( Agrilus granulatus , Say) 
s its eggs in the crevices of the rough bark, depositing them 
gly here and there, but sometimes only an inch or two apart, on 
: trunk and limbs old enough to become roughened by the fissures 
■1 cracks of the outer bark. The larvae penetrate the living bark 
l gnaw tortuous galleries in it and the young layer of wood just 
jieath. These galleries are at first as fine as the puncture of a 
| nbric needle, and never become larger than one-tenth of an inch 
!j diameter. For the most part they run in irregularly horizontal 
factions, or crosswise of the grain of the wood. When numerous, 
| they often are, they sometimes cross each other, but this is un- 
s nmon. They are closely packed with the excrement of the larvae. 
-he latter are exceedingly slender, 'slightly flattened, much eion- 
ed, footless and white; the first segment of the thorax is some- 
