REVIEW OF THE WASPS OF THE SUBFAMILY PSENINAE OF NORTH AMERICA (HYMENOPTERA : ACULEATA) By J. R. Malloch Biologist, Bureau of Biological Survey, United States Department of Agriculture INTRODUCTION This paper is the result of some work done several years ago and brought up to date now in order to make available to entomologists the data accumulated in working over the collections in the United States National Museum and the Bureau of Biological Survey. Originally started as a joint undertaking with S. A. Rohwer, of the Bureau of Entomology, the matter is presented by the author alone because press of work on other subjects compelled his collaborator to give up the project after making an examination of the Fox and Cresson types in Philadelphia in 1926. The author regrets that this action was forced upon his colleague and accepts the full respon-sibility for the matter presented herein. All material except four specimens of a few of the more common species, retained in the collection of the Bureau of Biological Survey for purposes of comparative work in connection with the examina-tion of stomach contents of birds and mammals by the Division of Food Habits Research, will be found in the collection of the United States National Museum, and all type specimens of new species except one are deposited in that institution. TAXONOMIC TREATMENT The group is herein accepted as a subfamily of the family Psen-idae, Pemphredoninae being the other subfamily of that family. There has been considerable confusion in the North American literature regarding the application of the generic names in Psen-inae, and also in determining the limits of the genera. It is with the purpose of clearing up the status and relations of these and their species that this paper is published. A careful examination has been made of the genotypes, and the decisions as to the validity of the various genera are based upon these examinations. The type specimens of most of the species described b}^ Cresson, Fox, Packard, and Viereck have been examined to determine their status, and every No. 2967. — Proceedings U.S. National Museum, Vol. 82. Art. 26 1
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