331] LARVAE OF THE TENTHREDINOIDEA—YUASA 13 



Acknowledgments. — I am deeply indebted to various scientists who 

 have assisted me by donation of specimens, by encouragement, and by 

 criticism and suggestions. I am obliged to the former Director of the 

 Maine Agricultural Experiment Station, C. D. Wood, and to Dr. Edith 

 Patch of the same Station; to Dr. J. Chester Bradley, of the Cornell 

 University, and to Professor S. A. Forbes, of the University of Illinois, for 

 the loan of specimens and for the privilege of examining collections under 

 their charge. I wish to thank Dr. J. G. Needham for the privilege of 

 working in the entomological laboratories of Cornell University during the 

 summers spent at Ithaca, and Mr. S. A. Rohwer, of the U. S. Bureau 

 of Entomology, Washington, D. C, for his generous criticism and for the 

 donation of valuable reprints. I am also indebted for separates to Dr. W. 

 E. Britton, and to Messrs. H. E. Burke and William Middleton; for the 

 donation of specimens, to Messrs. H. G. Crawford, Wm. Baerg, C. C. 

 Hamilton, R. W. Harned, J. W. McColloch, J. R. Malloch, H. S. Smith, 

 H. B. Weiss, and to Drs. W. E. Britton, C. H. Kennedy, Edna Mosher, and 

 Alvah Peterson; and for the loan of rare specimens of Cephidae and Xiphy- 

 dria, and of Monoctenus and Trachelus to Dr. E. P. Felt and Mr. S. A. 

 Rohwer, respectively. I take pleasure in acknowledging my deep in- 

 debtedness to Dr. Albert William Bellamy, of the University of Chicago, 

 for constant encouragement. I am greatly obliged to Professor William 

 Trelease, of the University of Illinois, and to Professor K. M. Wiegand 

 and Mr. A. R. Bechtel, of the Cornell University, for the identification 

 of the host-plants. It gives me great pleasure to acknowledge my lasting 

 obligation to Professor Alexander Dyar MacGillivray, under whose 

 supervision this work was undertaken, for his constant interest, encour- 

 agement, and helpful suggestions thruout the entire course of this study 

 and for identifying all of the bred specimens in my collection, as well as 

 for the privilege of using his unpublished morphological terminology. 



