INTRODUCTION VII 



his efforts. Some of his other collecting work in Mexico provided a 

 valuable set of specimens which were used in relating the species de- 

 scribed from Mexico and Central America to those in the southern 

 United States. 



Another strategic lot of material was from Mr. Gerd Heinrich of 

 Dry den, Maine, consisting of a beautifully prepared set of specimens 

 from Central Europe. A large portion of the genotype illustrations 

 was made from these, and the collection in general has been useful 

 for comparisons between the Nearctic and European faunas. A set 

 of named specimens received in exchange from Prof. Toichi Uchida 

 has been useful in dealing with the species of the eastern Palearctic. 



Collections included in the study are listed below. In the distribu- 

 tional data these are referred to by the names of their cities for insti- 

 tutional collections, or by the names of their owners for personal 

 collections. 



American Museum of Natural History, New York, New York 



California Academy of Sciences, San Francisco, California 



Canadian National Collection, Ottawa, Ontario 



Carnegie Museum, Pittsburgh, Pennsylvania 



Dreisbach Collection, Midland, Michigan 



Harvard University, Cambridge, Massachusetts 



Michigan State University, East Lansing, Michigan 



Mitchell Collection, Riverdale, Maryland 



North Carolina Department of Agriculture, Raleigh, North Carolina 



Ohio State University, Columbus, Ohio 



Oregon State College, Corvallis, Oregon 



Townes Collection, Ann Arbor, Michigan 



United States National Museum, Washington, District of Columbia 



University of California, Berkeley, California 



University of California at Davis, Davis, California 



University of Idaho, Moscow, Idaho 



University of Kansas, Lawrence, Kansas 



University of Michigan, Ann Arbor, Michigan 



University of Minnesota, St. Paul, Minnesota 



University of Wisconsin, Madison, Wisconsin 



Several colleagues have given assistance beyond the customary 

 loan of specimens. These are: Dr. Hugh B. Leech of the California 

 Academy of Sciences, Dr. Edwin F. Cook of the University of Minne- 

 sota, Miss Luella Walkley of the United States Department of Agri- 

 culture, Mr. G. Stuart WaUey and Dr. W. R. M. Mason of the 

 Canadian National Collection, and Mr. J. F. Perkins of the Natural 

 History Museum in London. Prof. Jan Noskiewicz and Dr. J. Aubert 

 have compared specimens for us with the types of Cryptus calescens 

 Gravenhorst and Cryptus Juscipennis Brulle, respectively. 



The drawings are by Miss Y. Morimoto, executed under the super- 

 vision of Prof. M. Tokunaga of Kyoto Prefectural University. Pho- 

 tomicrographs are by Mr. Louis Martony and Mr. Karl Kalmbach 



