r. S. D. A., V. v.. nu). TvS, Part III. F. T. I., Miinh 5. 1907 



SOMK INSKITS IXJriMOrS TO FOIIKSTS. 



ADDITIONAL DATA ON THE LOCUST BORER. 



{CiiUeiic rohiiiin' Fori^t. )" 



By A. D. Hopkins, 

 In Cli(ir{/t' of Forest Inxert Investigations. 



This pjirt of BuUotin '58 contains a partial i-evision of Part T. with 

 additional information based on the results of sul»se(iuent investiga- 

 tions l)y the writer and one of his assistants. Mi-. \\'. F. Fiske. 



SEASONAL HISTORY. 



The data under this head refer to the District of CoUinil)ia and vicin- 

 ity, latitude 31^^, altitude 10 to !♦(> feet above tide. 



HIBERNATION. 



Hil)ernation bei^ins soon after the larva' hatch from eggs deposited 

 at various times from August to October, and the peiiod is passed as 

 minute larva*, scarcely longer than the eggs from which they hatch, in 

 small individual hibernating cells excavated by them just lieneath the 

 corky baik and in the outer layers of the living bark on the main 

 trunk of the larger to small trees or small saplings, and larger to small 

 branches. 



.VfTIVTTV OK TIIK 0^■EI{WINTKI;K1) I..\H\ .K. 



Activity of tin* overwintered larv;e l)egins in .Vjuil. or with the l)egin- 

 ning of the mo\ement of the saj) in the t»aik and just Ix'foic the leaf 

 buds open. In ll^oC) activity began .Vpril II: on .\])ril l."! tlu' more 

 advanced individuals had entered to the wood, on the l»)th were gi'oov- 

 ing th<' surface, and on the 'J.'.th some of tlimi had enteriMl the wood. 

 Hy Mav 1 1 nearly all (»f them ha<l ent«'r(Ml the sapwood and soini' of 

 them had extended their bunous into tin' hraitwood and wnr rai)idly 



" OnliT Cok'optora, I'ainily (\Tmiil)yciilii-. 



31 



