508 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ue 



The principal variations are found in the clypeal process of the 

 female, which may have the points considerably extended and the 

 yellow markings on the surface greatly reduced or completely absent. 

 Cerceris stigmosalis Banks most closely resembles Cerceris sexta Say, 

 from which the females of the former may be separated by the form of 

 their processes and the much lighter shade of their markings. Pos- 

 sibly stigmosalis should be considered a subspecies of the latter. 



Types. — The type male of C. stigmosalis Banks, from Fargo, N. 

 Dak., September, on Solidago sp. (Stevens), is at the Museum of 

 Comparative Zoology, Harvard, no. 13778. The type male of C. 

 iugatrix Mickel, from Mitchell, Nebr., Aug. 4, 1916 (C. E. Mickel), is 

 at the University of Nebraska. The type female and allotype male of 

 C. sayi Banks, from Steele, N. Dak., July 13 (Stevens), are at the 

 Museum of Comparative Zoology, Harvard, no. 14706. The type 

 female of C. stevensi Banks, from Steele, N. Dak., (Stevens), is at the 

 Museum of Comparative Zoology, Harvard, no. 14707. 



Distribution. — In the United States and Canada stigmosalis is 



found in the North Central States, from Alberta south to Nebraska. 



The same species has been taken on the plateaus of central Mexico by 



the writer and other workers. Specimens are as follows: 



Alberta: cf, Bow Island, July 14, 1937 (C. L. Neilson) ; c?, Cypress, July 24, 

 1923 (E. H. Strickland) ; 2 c? c?", Lethbridge, July 29, 1916 (Sladen) ; 3 ? 9 , 2c? cf, 

 Lethbridge, July 28, Aug. 8, 14, 1914, Aug. 14, 1922, Aug. 15, 1939 (E. H. Strick- 

 land); 3 9 9 , 5c? d^, Lethbridge, July 24, 1922, Aug. 8, 1923, July 2, 5, 6, 8, 1923 

 (H. E. Gray) ; c?, Lethbridge, Aug. 7, 1923 (Walter Carter) ; 9 , 2 c? cf, Lethbridge, 

 Aug. 9, 1926 (E. R. Tinkham); 2 9 9 , 5c? c?, Lethbridge, Aug. 20, 1921, July 27, 

 29, 1922 (H. L. Seamans) ; 9 , Lethbridge, July 1, 1940 (R. W. Salt) ; 4 9 9 , 8 c? c?, 

 Manyberries, Aug. 11, 1939 (E. H. Strickland); c?, Manyberries, July 14, 1949 

 (Gordon A. Hobbs) ; 10 9 9, 4 c? c?, Medicine Hat, Aug. 7, 1938, July 29, 1939, 

 Aug. 9, 1939, Aug. 11, 1941 (E. H. Strickland) ; 3 9 9 , Medicine Hat, Aug. 1, 1917, 

 July 23, Aug. 23, 1919 (Sladen) ; 9 , Medicine Hat (J. R. Mallock) ; 9 , Medicine 

 Hat, Aug. 16, 1939 (J. L. Carr) ; c?, Pple. Spgs. [sic], July 1922 (H. L. Seamans); 

 3 c? c?, Suffield, July 29, 1949 (Gordon A. Hobbs) ; 5 9 9, 7 c? c?, TUley, Aug. 23, 

 1939, July 12, Aug. 11, 15, 1940, July 9, 20, 1941 (J. L. Carr). British Columbia: 

 9, Summerland, Aug. 10, 1916 (Sladen). Montana: c?, Elkhorn Mts. (W. M. 

 Mann); 9, Laurel, July 12, 1914 (M. A. C.) ; North Dakota: c?, Marmantle, 

 July 30, 1934 (A. C. Fox); 10 9 9, 8c? c?, Steele, July 13, 1919, Aug. 18, 1922, 

 Aug. 4, 1923 (0. A. Stevens); 9, Washburn, July 23, 1926 (0. A. Stevens). 

 South Dakota: c?, Buflfalo, Sept. 9, 1927 (H. C. Severin) ; 9, Wewela, Sept. 16, 

 1930 (H. C. Severin). Mexico: 3 9 9, 64 mi. NE. Durango, Durango, 6500 ft., 

 Oct. 19, 1957 (H. A. Scullen) ; 6 9 9, 3 c? c?, San Luis Potosf, S. L. P., 7300 ft., 

 Oct. 1-2, 1957 (H. A. Scullen). 



Prey record. — None. 



Plant record. — Cleome serrulata (Alberta), Kuhnistera oligochylia 

 (North Dakota), Solidago sp. (North Dakota). 



