252 



STATE BOARD OF AGRICULTURE. 



ally widens out in tlio form of a inimpcl until il hcconios about as wide as long. The 

 (oursf of till' mine is larjr<'ly deti'i inincd hy tlic lar^'c veins of the loaf after this stage, 

 and the iniiu' often is tunneled baek under the jwint where the original start was made. 

 I'ig. "i. These mines, as before stated, occiir on either the upper or lower surfaces of the 

 leaf. 



iifP^- 



■^<-, 





•jfcfe;-*" '- 



• •^■.3f:;j 



^00,^—' 





V 



■ -,r5-/-...y .,;tr«.A-*- 



Fig. 5. Apple-Leaf-miner, Tisrheria malifolieJla, work in apjjle and l)lackberry leaves. (Original.) 



The little caterpillar that builds the tunnel is about three-sixteenths of an inch in 

 length, slender, tapering gently from near the head to a very small size at the tail, 

 light yello\vi.sh-green in color, with a brow^nish black head. The legs are reduced to 

 mere depressions in the skin. The segments are strongly marked. Fig. 6. 



