WASP GENUS CERCERIS — SCULLEN 



397 



which has a sinuate margin but no distinct denticles; mandibles 

 smooth; antennae normal in form, dark amber except the lower 

 surface of the flagellum, which is lighter. 



Thorax black except for a divided band on the pronotum, two spots 

 on the scutellum, the metanotum, two spots on the enclosure, two 

 triangular areas on the propodeum, small evanescent spot on the 

 pleuron, and a patch on the tegula, all of which are light yellow; 

 tegulae lightly pitted and not elevated; enclosure relatively smooth 

 except for a central groove and a few deep pits along the lateral 

 borders; mesosternal tubercle absent; legs black except for elongate 

 areas on the sides of the tibiae and the basal parts of the tarsi; wings 

 subhyaline except for a clouded area along the anterior half and the 

 stigma, which is dark amber. 



Figures 28-30. — Localities of: 28, C. iruncata Cameron; 29, C. vanduzeei vanduzeet B&nks; 

 30, C vanduzeei eburnea Scullen. 



Abdomen black except for a broad band on tergum 1, narrow bands 

 on terga 2, 4, 5, and 6, small lateral spots on tergum 3, sternite 1, 

 and small lateral spots on sternites 2 to 6, all of which are light 

 yellow; pygidium oval with ends subequal and rounded; light yellow 

 patches to the sides of the pygidium. 



The extent of the light markings varies in both sexes. Some 

 specimens may show little or no yellow on the face, and the spots 

 on the enclosure may disappear. 



C. truncata Cameron closely resembles C. convergens Viereck and 

 Cockerell and C. kennicottii Cresson. In both cases the clypeal 

 process is the best distinguishing character. 



Type. — The type female of C. truncata Cameron, from Temax, 

 Yucatan, Mexico (Gaumer), is at the British Museum, no. 21.1,433. 



Distribution. — Southern Arizona, southern New Mexico, and 

 southern Texas. 



r742-463— 65 5 



