NEW FOEMS OF SPHECOID WASPS OF THE GENUS DIDINEIS WESMAEL By J. E. Malloch Biologist, Bureau of the Biological Survey and S. A. EOHWER Assistant Chief, Plant Quarantine and Control ACLmvnistration, Department of Agriculture The present paper contains a revision of the North American species of the genus Didineis Wesmael, with descriptions of two new species and one new variety. Genus DIDINEIS Wesmael Didineis Wesmael, Revue Critique, 1851, p. 96. — Kohl, Ann. li. k. Hofmus. Wien, vol. 11, 1896, p. 402.— Fox, Ent. News, vol. 5, 1894, p. 126. Kolil considers the genus Didineis as a subgenus of Alyson Jurine, but with the striking differences in the venation of the fore and hind wings (figs. 1, 2), together with the differences that seem to exist in the genitalia (figs. 3, 4), it would be desirable to recognize it as a genus, which has been done by many European and most American workers. Fox tabulated the American species in 1894. Since that time three new species have been described, and in the collections of the United States National Museum there are representatives of two additional new species and a new variety. To make it easier to rec-ognize these forms we have prepared the following key, which includes all the North American species; but the species marked with an asterisk is placed entirely on description. KEY TO THE NORTH AMERICAN SPECIES OP DIDINEIS 1. Females 2. Males 6. 2. Thorax and abdomen reddish-brown 3. Thorax and part of the abdomen black 4 3. Head black stevensi Rohwer, Head pale peculiaris Fox. 4. Apical tergites black *sanctacrucae Bi'adley. Abdomen entirely rufous 5, No. 2837.— Proceedings U. S. National Museum, Vol. 77. Art. 14 2599 — 30 1
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