2 UNITED STATES NATIONAL MUSEUM BULLETIN 2 76 



reviewed through May 1964. The manuscript was submitted to the 

 United States National Museum for publication in September 1964. 



Research described herein, particularly the field work carried out 

 in 1960, 1961, and 1962, was supported in large part by grant number 

 Ct-7468 from the National Science Fovmdation. 



It should be understood that all changes in nomenclature presented 

 in this publication are the sole responsibility of Stehr (not Stehr and 

 Cook). 



Acknowledgments 



Our sincerest appreciation is due the following individuals, and the 

 organizations they represent, for the use of their facilities while the 

 field work described in this report was being carried on: Dr. Carl B. 

 Huffaker and Dr. Kenneth S. Hagen, Department of Biological Control, 

 University of California (Albany facilities) ; Dr. Charles B. Eaton and 

 Dr. Ralph C. Hall, Pacific Southwest Forest and Range Experiment 

 Station (Hat Creek Field Station); Dr. Clifford E. Brown, Forest 

 Biology Laboratory, Calgary, Alberta (Seebe Field Station) ; Dr. L. A. 

 Carruth, Dr. Floyd G. Werner and Dr. George D. Butler, Jr., Depart- 

 ment of Entomology, University of Arizona (University of Arizona 

 Experimental Farm) ; Dr. B. Austin Haws, Department of Entomology, 

 Utah State University, Mr. Gordon Van Epps, Snow College, Ephraim 

 Utah, and Mr. Larry Stewart, Snow Field Station, Ephraim, Utah 

 (Snow Field Station); Dr. Donald K. Scharff, Department of Ento- 

 mology, Montana State College, and Mr. and Mrs. C. E. Axtell, 

 Bozeman, Montana (private property). It would have been difficult 

 to accomplish much of the field work if these facilities had not so kindly 

 been made available. 



We wish to acknowledge and thank the following individuals for 

 their cooperation in collecting specimens, lending specimens, and for 

 assistance given in numerous other ways: F. H. Rindge, American 

 Museum of Natural History; C. D. MacNeill, California Academy of 

 Sciences; R. L. Langston, E. A. Steinhaus, P. D. Hurd, Jr., and J .A. 

 Powell, University of California, Berkeley; G. T. Okumura and A. G. 

 Forbes, California State Department of Agriculture; E. G. Munroe 

 and M. R. MacKay, Canadian National Museum; R. H. Fox and 

 G. W. Wallace, Carnegie Museum; H. S. Dybas and R. L. Wenzel, 

 Chicago Museum of Natural History; F. Pacheco, Colegio de Post- 

 Graduados, Chapingo, Mexico; L. L. Pechuman, Cornell University; 

 D. L. Arrieta M., Director General de Defensa Agricola, Departamento 

 de Entomologia, Mexico, D. F.; R. Coronado P., Escuela Nacional de 

 Agricultura, Chapingo, Mexico; W. L. Sippell, Forest Insect Labora- 



