NO. II LARVAE OF THE ELATERID BEETLES GLEN 3 



Entomology, University of Minnesota, for assistance in planning and 

 developing the study; W. J. Brown, Ottawa, Canada, for the iden- 

 tification of all reared adults made available to the writer and for 

 assistance with nomenclatorial and taxonomic difficulties ; M. C. Lane, 

 Walla Walla, Wash., for the identification of reared adults in his 

 possession and for his cooperation in obtaining larval material ; and 

 H. G. Crawford, formerly Chief, Field Crop Insect Investigations, 

 Canada, from whom encouragement and generous support at the 

 administrative level was received throughout the study. 



In acknowledging the loans and gifts of larvae, the writer must 

 especially thank Dr. J. McDunnough, formerly Chief of Systematic 

 Entomology, Ottawa, Canada, for permission to use the material in 

 the Canadian national collection ; C. F. W. Muesebeck, Chief of the 

 Division of Insect Identification, United States Bureau of Ento- 

 mology and Plant Quarantine, and Dr. E. A. Chapin, Curator of 

 Insects, United States National Museum, for the privilege of study- 

 ing the larval Elateridae assembled at Washington ; C. A. Thomas, 

 Kennett Square, Pa., for granting access to the collection of the 

 Pennsylvania Agricultural Experiment Station ; Dr. Fritz van Emden 

 and Dr. K. G. Blair, of the British Museum of Natural History, Lon- 

 don, England, for the use of both personal and museum material ; 

 Dr. Mathias Thomsen, Royal Veterinary and Agricultural College, 

 Copenhagen, Denmark, and Dr. S. L. Tuxen, University Zoological 

 Museum, Copenhagen, for important Danish material ; Dr. Uunio 

 Saalas, Helsingfors, Finland, for larvae of several European species ; 

 and W. A. Rymer Roberts, Cambridge University, Cambridge, Eng- 

 land, for reared adults and their larval exuviae of the genotype 

 Ludhis cupreus (Fabricius). The use of other larval material is 

 gratefully acknowledged to each of the following contributors : 

 W. A. McDougall, Central Sugar Experiment Station, Mackay, 

 Queensland, Australia; Dr. Herbert H. Ross, Illinois State Natural 

 History Survey, Urbana, 111. ; Sarah E. Jones, University of Illinois, 

 Urbana, 111. ; H. H. Jewett, Agricultural Experiment Station, Lex- 

 ington, Ky. ; M. W. Stone, United States Entomological Laboratory, 

 Alhambra, Calif. ; R. P. Gorham, R. E. Balch, and Dr. R. F. Morris, 

 Dominion Entomological Laboratory, Fredericton, New Brunswick; 

 Dr. G. M. Stirrett, Dominion Entomological Laboratory, Chatham, 

 Ontario ; and all the permanent staff members of the Dominion Ento- 

 mological laboratories at Brandon, Manitoba, Lethbridge, Alberta, 

 and Saskatoon, Saskatchewan. 



All illustrations were prepared by the writer. 



