Bui. 437, U. S. Dept. of Agriculture. 



Plate IX. 



Work of Flat-Headed Borers. 



Fi(i. 1. — Ksrgs of Af/riluH anncHr.UH lai<l Hiiixly on twigs of live oiik (Quercrm af/ri/olia). 

 /I. FlO. 2. — Kkk of Ajjriliuf Hp. laid KitiKly on hUmii of nmiizanita {Arrtontaphj/los 

 vofcula). XI. K(0. 3. — JCk« moHscs of Ai/riliiH pidUiiK on bark of .stem of arr'o.vo 

 wiUow {SalU IfutwkpM}. Some covered wiili the pnitceiive covering, some uncdv- 

 r.Tcd. Xj. Flo. 4.— Egg inaH«eH of A (/rUuH hi>. oi\ bark of trunk of while alder 

 ( AlnuH ilidmhijiilid). /i. Vui. .5.— Trunk of living white alder (A/min rliiiiiihi- 

 folin ) hiiowiiiK i-XK nia-v.wH of yl.r/n7/i« sp. and the .^aj) flowing from Ihe wounds 

 eau.sed hy the feeding of the young larv;i:. y,\. Flo. O.— Sec lions fn mi the I run k 

 of a living white aldi.-r (/l/7/w.« W/'/m/z/yr^WH) nhowing old egg niii.'-ses on the Imrk, 

 larval work under the hark, aii<l the "eraU.Ts" fonmil in llic hnrk wln-n llie 

 altaek wa.H not Hevere enough to kill Ihe tree. The hrond died in I he lurviil stage; 

 and the wound will euusi; a check In tliu wood. XI- ( l'h(Hogra|)hs hy 11. K. 

 lliirke.) (Original.) 



