376 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lis 



Plant record. — Acacia augustissima (Arizona), Chilopsis sp. (New- 

 Mexico), Crotonella neomexicanum (New Mexico), Larrea tridentata 

 (Texas), Opuncta sp. (Texas), Pedis pepposa (New Mexico). 



15a. Cerceris echo echo Mickel 



Figures 15, 118a,b,c 



Cerceris echo Mickel, 1916, p. 412.— Mickel, 1917b, p. 453.— ScuUen, 1951, p. 1007. 

 Cerceris rufinoda crucis H. S. Smith, 1908, p. 370 (in part). 



Female. — Length 9 to 10 mm. Color black and reddish amber 

 with yellow markings; closely and deeply punctate; clothed with 

 very short sUvery hairs. 



Head one-sixth wider than the thorax, black except large lateral 

 eye patches, small spots back of the compound eyes, basal end of 

 mandibles, and patch on scape, which are yellow; clypeal border 

 with two widely separated broad extensions, between which is a 

 single denticle, and laterad of each extension is a low denticle-like 

 process; clypeal surface process is in the form of a low transverse 

 ridge wdth the extremities dentiform; mandibles with one centrally 

 located denticle, more apicad of which is a low rounded elevation; 

 antennae normal in form, scape yellow to light amber, peduncle 

 amber, flagellum light amber below, dark above. 



Thorax, exclusive of the propodeum, black except for two elongate 

 patches on the pronotum, two spots on the metanotum, and patch 

 on the tegulae, all of which are yellow; tegulae sparsely pitted and 

 slightly elevated; propodeimi dorsally reddish amber except for the 

 enclosure, which is black; enclosure deeply pitted and rugose with a 

 prominent central groove; mesosternal tubercle small and black; legs 

 largely amber basally, becoming more yellow beyond the middle of 

 the femora; wings slightly clouded. 



Abdomen: tergum 1 reddish amber; terga 2 to 5 black with bands 

 of light yellow, that on tergum 2 broader and not emarginate as are 

 the others; venter black except for the first stemite, which is reddish 

 amber; pygidium oval, narrowing, and rounded at both ends. 



Male. — Unknown. It may be confused with closely related 

 species. (See note under rufinoda rufinoda Cresson, p. 394.) 



Type. — The type female, taken at Monroe Canyon, Sioux Co., 

 Nebr., Aug. 4, 1908 (C. H. Gable), is at the University of Nebraska. 



Distribution. — Widely distributed but not collected in any great 

 numbers over the Central Plains States from southern Canada to the 

 Mexican border. Recorded from Alberta, Idaho, Montana, North 

 Dakota, South Dakota, Minnesota, Iowa, Nebraska, Kansas, 



