508 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1920. 



Comstock, Report of United States Entomologist for 1879; A. E. 

 Brunn, Second Report, Cornell University Agricultural Experiment 

 Station for 18S2-S3 ; J. II. Comstock and M. V. Slingerland, Cornell 

 Experiment Station Bulletin 23, 1890; and M. V. Slingerland and 

 Philena B. Fletcher, Cornell Experiment Station Bulletin 214, 1903. 

 These papers and others deal also with the destructiveness of the 

 insects to apple trees and treat of means for controlling them. The 

 resplendent shield-bearer occurs only occasionally in such numbers 

 as to make it a serious pest, and late summer sprays with arsenicals 

 are usually sufficient to keep the Bucculatrix caterpillars in control, 

 though winter washes of lime sulphur or miscible oils are also recom- 

 mended for killing the hibernating pupae in their cocoons. 



Plate 1. 

 The resplendent shield-bearer (Coptodisca splendwiferella). 



A. The winter case ( X7) from which the moth has emerged, leaving the pupal 



skin (a) projecting from the door. 



B. Pupa (X7). 



C. Moth at rest on twig (X7). 



D. Moth with wings spread (X7). 



E. Apple leaves containing the larval mines. 



F. Leaf mine broken open, showing the summer larva feeding within between 



the two surface'layers of the leaf (X7). 



G. Leaves showing perforated mines (b, b) from which the caterpillars have 



cut their cases ; c, a caterpillar with its case out on the leaf ; d, another 



hanging at end of a thread. 

 H. Cases attached to the twigs at e and e. 

 I. Caterpillar crawling, carrying its case on its body (X7). 

 J. Case hung up for the winter (X7). 

 K. The prepupal and hibernating stage of the caterpillar (X7). 



Plate 2. 

 The ribbed-cocoon-maker of the apple {Bucculatrix powifoliella). 



A. Apple twigs showing Bucculatrix cocoons («, a) attached to it. 



B. Pupa (X7). 



C. Winter cocoon from which the moth (D) has emerged, leaving the pupal 



skin (b) projecting from the opening (X7). 



D. Moth sitting on a piece of bark (X7). 



E. Eggs on under side of apple leaf. 



F. An egg near midrib on piece of leaf (greatly magnified). 



(1. Upper surface of leaf, showing mines of young caterpillers (c) and first 



molting cocoons (d). 

 H. Leaf showing feeding areas of caterpillars in subsequent stages. 

 I. The mature caterpillar (X7). 

 J. Tip of a leaf ( X2J) showing a caterpillar feeding at e, and a second molting 



cocoon at /. 



