INSECT ENEMIES OF WESTERN FORESTS 71 



Figure 29. — A, Monterey pine needles galled by the Monterery pine midge 

 (Thecodiplosis pini-radiatae) ; B, adult midge. Enlarged. 



the dying tips the bark will be found to be pitted with small resin- 

 ous pockets, in each of which are small bright-red maggots. If the 

 pockets are not numerous enough to kill the terminal, the injury 

 heals over, but for several years the annual rings are distorted 

 into a peculiar whorl until the pocket is completely covered. This 

 produces a defect in the grain of ponderosa pine lumber known 

 as "bird's-eye pine" which actually enhances its value for finishing 

 purposes. 



The Monterey pine resin midge (Retinodiplosis resinicoloides 

 Wms.) is another small pitch midge which inhabits the resin exu- 

 dations of Monterey pine but apparently is not injurious to the 

 trees, 



