NORTH AMERICAN GEOTRUPINAE — ^HOWDEN 153 



Without the generous loan of specimens from numerous institutions 

 and individuals, the present work could not have been accomplished. 

 In the following list of collections studied, the letters in parentheses 

 represent the abbreviations used in the text when citing material 

 studied; the name of the curator responsible for the loan of the speci- 

 mens follows the abbreviation: Academy of Natural Sciences of 

 Philadelphia (ANSP), J. A. G. Rehn; American Museum of Natural 

 History (AMNH), Mont A. Cazier; British Museum (Natural His- 

 tory) (BM), F. I. van Emden; California Academy of Sciences (CAS), 

 H. B. Leech; Canadian Department of Agriculture (CC), W. J. Brown; 

 Carnegie Museum (CM), G. Wallace; Chicago Natural History 

 Museum (CNHM), Henry S. Dybas; Cornell University (CU), 

 Henry Dietrich; Emory University (EU), P. W. Fattig; EmoryUni- 

 versity Field Station (EUFS), S. Breeland; Illinois Natural History 

 Survey (INHS), M. W. Sanderson; Iowa State College (laSt), J. L. 

 Laffoon; Museum of Comparative Zoology (MCZ), P. J. Darlington; 

 North Carolina Department of Agriculture (NCSM), D. L. Wray; 

 North Carolina State College (NCSC), T. B. Mitchell; Ohio State 

 University (OSU), J. N. KnuU; Oregon State College (OSC), P. O. 

 Ritcher; Tulane University (TU), A. Miller; United States National 

 Museum (USNM), O. L. Cartwright, E. A. Chapin and W H.. 

 Anderson; University of Arizona (UA), George D. Butler; University 

 of California, Davis (UCD), A. T. McClay; University of Idaho 

 (Unid), W. F. Barr; University of Kansas (UnKa), R. H. Beamer 

 and P. J. Spangler; University of Maryland (UnMd), E. N. Cory; 

 University of Michigan (UnMich), T. H. Hubbell and A. L. Olson; 

 University of Missouri (UnMo), G. W. Thomas; University of Wis- 

 consin (UnWis), R. D. Shenefelt and E. W. King. 



In addition, I am indebted to the following individuals who kindly 

 loaned material for study from their personal collections: O. L. 

 Cartwright, T. Daggy, R. W. Dawson, B, K. Dozier, M. Robinson, 

 P. J. Spangler, and F. N. Young. 



Thanks also are due to Drs. O. H. Fulkner, B. B. Fulton, D. L. 

 Grosch, Z. P. Metcalf, T. B. Mitchell, and T. L. Quay of North 

 Carolina State College, and to Dr. W. L. Engles of the University of 

 North Carolina for suggestions and corrections in the manuscript. 

 B. K. Dozier and W. H. Long were able field assistants on some 

 occasions. 



Dr. F. I. van Emden, British Museum, and Dr. S. L. Tuxen, 

 Zoologische Museum, Copenhagen, were extremely helpful in com- 

 paring specimens with type material. 



My wife, Anne, was of tremendous help, both in the field and in 

 the typing of the manuscript. Without her encouragement and help 

 the work involved would have been much more difficult. 



