462 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ue 



Thorax black except for two widely separated patches on the 

 pronotum, the metanotum, and the tegulae, all of which are yellow; 

 tegulae low and smooth; enclosure smooth except for a very faint 

 medial groove; mesosternal tubercle absent; legs fuscous to near the 

 apical ends of all femora, beyond which they are fulvous; wings 

 subhyaline but somewhat clouded with amber. 



Abdomen with a broad but divided band on tergum 1, a broad band 

 with variable amounts of emargination on terga 2, subequal narrower 

 bands on terga 3 to 5; venter immaculate; pygidium with sides 

 subparallel, ends subequal, and the apical one rounded laterally. 



Male. — Unknown. It may be confused with the males of closely 

 related species. 



From specimens named by Banks, it appears he considered this the 

 female of C. deserta Say; however, it is not the female of that species 

 (see discussion under C. deserta Say). 



Types.^ — -The type female, from Falls Church, Va., June 18 (N. 

 Banlcs), is deposited at the Museum of Comparative Zoology, Har- 

 vard, no. 30447. Paratypes are as follows: 



Connecticut: 9, Black Point, July 8, 1896. District of Columbia: 9, 

 June 13, 1886 (T. P. Pergande). Illinois: 9, Carlingville (Charles Robertson). 

 Kansas: 2 9 9, Burbon Co., 800 ft. (R. H. Beamer). Massachusetts: 9, 

 Nantucket, July 16, 1926 (C. W. Johnson); 9, Southampton, July 14, 1894. 

 Maryland: 9, Indian Hdw. [Head?], Aug. 27, 1902 (J. C. Bridwell). Missouri: 

 9, Berry Co., June 2, 1936 (B. Frank Blair). North Carolina: 9, Tryon, 

 juniper (W. F. Fiske). New jersey: 9, Riverton, July 18, 1909 (G. M. 

 Greene); 9, Trenton, July 5. New york: 9, White Plains, June 29, 1918 (J. 

 Bequaert). Virginia: 9 (T. Pergande); 9, July 1, 1883 (T. Pergande); 9, 

 Glencarlyn, July 2, Ceanothus (N. Banks); 9, Rosslyn (Chittenden); 2 9 9 

 [no data]. 



Distribution. — Scattered records over the Eastern States, west to 

 Missouri. 



Prey record. — None. 

 Plant record. — ^None. 



50a. Cerceris bicornuta bicornuta Gu6rin 



Figures 71, 153a,b,c,d,e 



Cerceris bicornuta Guerin, 1845, p. 443. — Smith, F., 1856, p. 466. — Cresson, 

 1865, p. 117.— Packard, 1866, p. 61.— Saussure, 1867, p. 100, pi. 4, fig. 58.— 

 Cresson, 1872, p. 227; 1875, p. 717.— Robertson, 1887, pp. 202-216, 246.— 

 Cresson, 1887, p. 282.— Schletterer, 1887, p. 486.— Cameron, 1890, p. 127.— 

 Robertson, 1891, p. 570.— Dalla Torre, 1897, p. 453.— Bridwell, 1898, 

 p. 209.— Smith, J. B., 1900, p. 519.— Viereck, 1903, p. 120.— Viereck and 

 Cockerell, 1904, p. 130.— Smith, J. B., 1910, p. 678.— Banks, 1912a, p. 16.— 

 Mickel, 1917b, p. 446.— Bequaert, 1928, p. 62.— Rau, 1928, pp. 337-341, 

 pi. 24.— Cartright, 1929, p. 35.— Scullen, 1942, p. 188.— Guiglia, 1948, 

 p. 179.— Scullen, 1951, p. 1005. 



