WASP GENUS CERCERIS — SCULLEN 441 



half of the mandibles, and the scape, all of which are yellow; clypeal 

 margin with five closely placed, denticle-like processes, the two 

 lateral ones being much lower and broader than the medial thi-ee, 

 which are subequal to each other; the clypeal process reduced to a 

 low rounded elevation slightly more than an exaggerated convex 

 area; mandibles with three closely placed denticles, the most apical 

 one very large; antennae normal in form, fulvous below on the 

 flagellum and darker above. 



Thorax black except for two elongate patches on the pronotum, 

 band on the scutellum, an elongate patch on the propodeum, and 

 the tegulae, all of which are yellow; tegulae low and smooth; enclosm-e 

 smooth except for a limited number of deep pits along the lateral 

 borders; mesosternal tubercles absent; legs largely dark fuscous 

 basally to or beyond the middle of the femora, beyond which they 

 are mostly yellow; wings subhyaline but lightly clouded toward 

 the apex. 



Abdomen black except for a uniform band on tergum 1 and sub- 

 equal emarginate bands on terga 2 to 5, all of which are light yellow; 

 venter immaculate; pygidium with the sides convex and the apical 

 end somewhat wider than the basal end. 



Male. — Length 10 mm. Black with yeUow markings; punctation 

 and pubescence average. 



Head subequal in width to the thorax; black except for the entire 

 face, a minute spot back of the compound eye, small spot on the 

 mandible, and a patch on the scape, all of which are yellow; clypeal 

 border slightly extended, showing three indistinct undulations; hair 

 lobes very wide and ahnost meeting at the meson; mandibles with one 

 denticle on a broad base; antennae normal in form. 



Thorax black except for two elongate patches on the pronotum, a 

 semidivided band on the scutellum, and a patch on the tegulae, all of 

 which are yellow; enclosure smooth except for a slight medial groove 

 and coarse punctations along the lateral margins; mesosternal tubercles 

 very prominent and acute with the points extending toward the 

 posterior; legs colored as follows: forelegs dark to apical end of the 

 femora, beyond which they are largely yellow; the midlegs with the 

 two basal segments dark above and yellow below, the femora dark 

 except for a small yellow spot near the apical end, the tibiae and tarsi 

 yellow except for a dark patch on the tibiae; the hindlegs with the 

 two basal segments largely yellow, the femora dark, and the tibiae 

 and tarsi largely yellow except for a large dark patch on the tibiae; 

 wings subhyahne but clouded near the apex. 



Abdomen with subequal light yellow bands on all terga 1 to 6; venter 

 with variable light yellow lines on sternites 2 and 3; pygidium with 



