PLECOPTERA OF NORTH AMERICA 7 



C. Smith, C. K. Sibley, E. C. VanDyke, E. P. Van- 

 Duzee, R. J. Weith. 



In working over the materials and in the prepara- 

 tion of drawings we have been aided by many of our 

 advanced students, especially the following: Miss 

 Hazel E. Branch, Miss Ellen Edmonson, Miss Mary 

 J. Fisher, Mrs. Quinta Cattell Kessel, Miss Leola J. 

 Kruger, Miss Theresa McConnell, Miss Theresa M. 

 Robinson, Mr. C. F. Wu, also by Mr. Albert Force 

 and Mr. C. H. Curran. Very special courtesies have 

 been shown us in the way of museum privileges by 

 Abbe Huard of the Provincial Museum Quebec ; by 

 Mr. Samuel Henshaw of the Museum of Compara- 

 tive Zoology; by Dr. Walther Horn of the Berlin 

 Museum, in the loan for study of Burmeister's types 

 and by Dr. Nathan Banks in the loan of manuscript 

 notes on types in the British Museum. Our figures 

 of the species of Pteronarcys are copied from the 

 plates of Lucy Wright Smith. Much assistance has 

 been given by Mrs. V. N. Argo in the reading of the 

 proofs. 



