482 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ns 



A female of C. occidentalis Saussure, designated a lectotype by the 

 writer, is at the Museum d' Histoire Naturelle, Geneva. Both of the 

 above were typical lighter forms of C. frontata Say and were from 

 Texas. This is our largest species of Cerceris in North America. 



Distribution.' — Throughout the South Central States and the 

 Southwest, from southern Illinois, southern Nebraska, Colorado, 

 Utah, and central California, south into Mexico. 



Prey records. — Lixus mucidus LeConte (California; Curculioni- 

 dae), Eupagoderes sp., and Cleonus pvlvereus LeConte (Krombein, 

 1960b, Portal, Ariz.). 



Plant record.' — Acacia sp. (Arizona), A. augustissima (Arizona), 

 Ampelopsis arborea (Texas), Ascelpias sp. (Arizona, New Mexico, 

 Mexico, and Texas), A. speciosa (Utah), A. subverticUlata (Arizona), 

 Baccharis sp. (Arizona, Mexico), B. glutinosa (Arizona, Mexico), 

 Baileya pleniradiata (Arizona), Eriogonum sp. (California), E. thomasii 

 (Arizona), Gutierrezia sarothrae (Arizona), Lepidium sp. (Arizona), 

 Melilotus alba (Arizona, Kansas, New Mexico), Mimosa sp. (Arizona), 

 parsnip (Texas), Petalostemum midtiflorum (Texas), Salsola pestifer 

 (Utah), Solidago sp. (Kansas), Spindus saponari (Arizona). 



56b. Cerceris frontata raui Rohwer 



Figure 82 



Cerceris raui Rohwer, 1920, p. 230.— Rau, 1922, p. 21; 1928, pp. 325-337.— 



Scullen, 1951, p. 1010. 

 Cerceris frontata raui Scullen, 1960, p. 80. 



Female. — Length 20 mm. Structurally like C. frontata frontata 

 Say but considerably darker. 



Head dark ferruginous with the antennal and ocellar areas dark 

 fuscous. 



Thorax black and dark ferruginous; metanotum and tegulae yellow; 

 yellow may also appear on the propodeum and the scutellum; legs 

 dark ferruginous; wings hea\Tly clouded with ferruginous. 



Abdomen largely dark ferruginous; yellow bands on terga 3 to 6 

 deeply emarginate or broken into two lateral patches; venter rufo- 

 ferruginous. 



Male. — Length 17 mm. Structurally Uke the male of C. frontata 

 frontata Say but with yellow markings much more limited. 



Head black except the face yellow and small amber spots back of 

 the eyes. 



Thorax black except for two patches on the pronotum, two spots 

 on the scutellum, the metanotum, and the tegulae, all of which are 

 yellow infused with ferruginous; legs ferruginous and yellow; wings 

 lightly clouded with ferruginous. 



