INSECT ENEMIES OF WESTERN FORESTS 4] 
dead lateral shoots the damage is often referred to as tip droop. 
The terminal leaders of young, thrifty trees are seldom killed, but 
the growth may be shortened. Lucosma sonomana Kearf. in the 
larval stage bores through the pith of the terminal twigs of pon- 
derosa pine and Engelmann spruce. “. bobana Kearf. is an och- 
reous-colored moth with white spots on the forewings and a wing 
expanse of about Linch. The larvae have been found boring through 
the pith, cones, and seeds of ponderosa, Jeffrey, and knobcone pines 
in California and Oregon. /. rescissoriana Hein. is a dark brick- 
red moth with faint sprinklings of black scales. It has about seven- 
eighths of an inch wing expanse. The larvae feed through the pith 
and cones of lodgepole pine in California and Oregon. 
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FiGurE 17.—A pitch nodule moth (Petrova metallica): A, Pitch nodule opened to show 
larval mine; B, larva, X 3; C, pitch nodule with chrysalid protruding; D, adult moth, 
Xx 1.8; H, nodule opened to show larva of moth surrounded by three parasite pupae 
and at right adult chalcid fly, parasite of the larvae of P. metallica, X 4. (Drawings 
by Edmonston.) 
BarRK MorTHs 
Some of the species of the genus Laspeyresia are cambium miners, 
working in the bark of various coniferous trees. Laspeyresia 
inopiosa Hein. works in the bark of lodgepole pine in Idaho. ZL. 
laricana Busck feeds in the cambium of larch and Douglas fir. Z. 
leucobasis Busck works in the bark of larch and Engelmann spruce. 
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