REVISION OF GENUS EUCERCERIS CRESSON 71 



38. Eucerceris vittatifrons Cresson 



Figures 46, 96 a, b, c, d, e, f 



Eucerceris vittatifrons Cresson, 1879, p. xxiv; 1882, pp. vii, viii; 1887, p. 281.— 

 Ashmead, 1899, p. 295.— Cresson, 1916, p. 101.— Scullen, 1939, pp. 17, 19, 

 51-53, figs. 31, 49, 72, 86, 105, 119, 133, 153; 1948, pp. 157, 158, 180; 1951, 

 p. 1013. 



Cerceris vittatifrons Dalla Torre, K. W. Von, 1890, p. 202.— Dalla Torre, C. G., 

 1897, p. 481. 



Type. — The lectotype male of E. inttatifrons Cresson from Nevada 

 (H. K. Morrison) is in the collection at the Philadelphia Academy 

 of Natural Sciences, no. 1969.1. 



The female of E. vittatifrons Cresson is very close to the female 



Figure 46. Western U.S. E. vittatifrons 

 Cresson 



of E. arenaria Scullen but they may be separated by the following 

 characters: The elevation on the medial clypeal surface is more 

 prominent and pointed on the latter than on the former, and the 

 basal end of the pygidium of the latter is not constricted as it is in 

 the former. 



DiSTRiBUiiON. — All Pacific western states. Specimens from Mexico 

 are as follows: 



MEXICO: Aguascalientes: c?", 12 km. N. Rincon de Romos, July 28, 1951 

 (H. E. Evans). San Luis Poxosf: Scfcf, 10 mi. NE. San Luis PotosJ, 6,200 ft. 

 elev., Aug. 22, 1954 (Dreisbach); d' 84 mi. NE. San Luis Potosf, 4,000 ft. elev., 

 Aug. 22, 1954 (Dreisbach); 3cf cf, 18 mi. W, San Luis Potosi, 6,000 ft. elev., 

 Aug. 21, 1954 (J. G. Chilcott). 



Prey record. — None. 



