GENERAL 



13 



Linear mines are formed when the larva tunnels straight 

 ahead through the parenchyma. If the course taken be 

 winding they are called serpentine mines. 



Fig. 7. Mine types, a and b, upperside blotch mines of Lithocolletia; 

 c, full depth blotch mine of Brachys; d, a serpentine mine of Nepticula; all 

 on a leaf of white oak. 



Blotch mines are formed when the larva excavates a broad 

 patch. The blotch may take on various shapes, circular, 

 oblong, lobed, etc. When a number of slender lobes radiate 

 from its margin, it is called a digitate mine. 



