178 PAPERS BY DR. B. CLEMENS. 



very dark, concolorous green, shield paler; head pale brown, 

 varied with darker brown. 



The tube is very long, cylindrical, enlarging from the 

 beginning;, which is a mere thread until it attains considerable 

 thickness. The open extremity is covered by a web, in the 

 middle of which is a gallery lined on each side with frass, and 

 the larva passes through it in order to feed. In feeding the 

 larva leaves the outer cuticle and the net-work of veins 

 entire. 



About the middle of September the larva abandons its 

 tube to form a cocoon on the surface of the ground. I have 

 seen numbers of this larva on oaks in Minnesota, near 

 St. Paul. 



2. C. Aceriella. The larva forms a moderately long, 

 slender, cylindrical tube at the base of the leaf of maple, 

 A. rubrum, early in July, and is covered with a thin trans- 

 parent web closed in advance. The tube increases in diameter 

 from the beginning to the end and is placed between two 

 principal veins of the leaf, and the web is extended from one 

 vein to the other. 



3. C? Hamamelielld. The larva constructs a little, short 

 tube of frass along the midrib of the leaf of witch-hazel, 

 Hamamelis Virginica, during the latter part of September. 

 The tube is begun in the angle made by a vein and the mid- 

 rib, and the triangular space between them is covered with a 

 thin web of silk, having beneath it the tube. 



The larva is nearly cylindrical, slender, with the head 

 pointed. It is of a uniform, rather pale-green colour. 



