414 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lie 



folm (Massachusetts), Stillingia sylvalica (Texas), water parsnip 

 (Texas), Vitex negundo (Texas). 



29a. Cerceris grandis grandis Banks 



Figures 37, 132a,b,c 



Cerceris grandis Banks, 1913b, p. 423; 1947, p. 10.— ScuUen, 1951, p. 1008. 



Female. — Length 19 mm. Light yellow amber with limited 

 markings of medium amber; punctation sparse and shallow; 

 pubescence very short except in the region of the propodeum and first 

 abdominal segment. 



Head subequal in width to the thorax; Ught yellow amber except 

 patch in ocellar area, small patch on occiput and clypeal margin, all 

 of which are light amber, and the apical part of the mandibles, which 

 are dark amber; clypeal margin with two acute denticles opposite the 

 junction of the middle and lateral lobes of the clypeus, and two mesal 

 denticles that are broad and flat; clypeal surface convex with two 

 conspicuous small surface denticles just above the clypeal border; 

 mandibles with one broad but pointed denticle, apicad of which is a 

 depression; antennae normal in form with the scape mostly yellow 

 and the remaining segments light amber. 



Thorax largely hght yellow amber with a broad mesal stripe and 

 two narrow lateral stripes of amber on the mesotergum and more or 

 less amber along all sutures; enclosure heavily ridged at 45° angle to 

 the base; legs yellow; wings subhyaUne. 



Abdomen all yellow; pygidium with sides narrowing abruptly to a 

 rounded apical point. 



Male. — Length 14 mm. Coloration close to that of the female 

 but with somewhat more amber; punctation and pubescence as in the 

 female. 



Head subequal in width to the thorax; largely yellow with dark 

 amber stripes between the antennal scrobes and ocelli, and an ir- 

 regular area of amber on the vertex; clypeal surface convex; clypeal 

 margin extended on the medial lobe with the margin showing three 

 inconspicuous denticle-like points; mandibles smooth; antennae 

 normal except the apical segment, which is slightly curved. 



Thorax largely light yellow amber except the mesotergum, which 

 is light amber; tegulae not elevated and relatively smooth; enclosure 

 smooth except for inconspicuous ridges that appear in the lateral 

 angles. 



Abdomen entirely yellow except for slight amber shading along 

 some sutures; pygidium with sides converging slightly to a truncate 

 apex. 



C. grandis grandis Banks is very close to C. calijornica arno Banks, 



