WASP GENUS CERCERIS — SCULLEN 345 



38. Lateral apices of the clypeal process considerably prolonged giving the 



appearance of horns or the points of a new moon 39 



Lateral apices of the clypeal process not greatly prolonged 40 



39. Terga of the abdomen almost entirely yellow . . . frontata frontata Say 

 Terga of the abdomen with yellow bands much reduced. 



frontata raui Rohwer 



40. Distance between apices of the clj^peal process very much less than one- 



third the distance between the eyes; surface of the clypeal process not 



lunar shaped mimica Cresson 



Distance between apices of the clypeal process approximately equal to or 

 greater than one-tliird the distance between the eyes; surface of the 



clypeal process somewhat lunar shaped 41 



4L Mostly black to dark amber with limited yellow. 



bicorniita bicornuta Guerin 

 Mostly light amber and yellow . . bicornuta fidelis Viereck and Cockerell 



42. Tergum 2 black or dark amber without a yellow band (small evanescent 



yellow spots may appear) 43 



Tergum 2 with a yellow band 44 



43. Clypeal process as long as or longer than its width at the base and with a 



definite overhang; tergum 1 with a creamy yellow lateral border, black 



medially azteca Saussure 



Clypeal process very low without an overhang extension (somewhat similar 

 to that of C. bicornuta Guerin) ; tergum 1 with a broad medial yellow 

 patch and black lateral borders tolteca Saussure 



44. Clypeal process with a single acute apex (mostly Northeastern States, 



rarely in Texas) nitida Banks 



Clypeal process with two or more apices 45 



45. Clypeal medial lobe with a single medial acute denticle flanked by a pair of 



blunt denticles, all black melanthe Banks 



Clypeal medial lobe with a pair of yellow denticles connected by a low 

 concave carina boharti ScuUen 



Group I 



L Elevated process on the free surface of the central clypeal lobe distinctly 



separated from the anterior border 2 



Clypeal process or denticles confined to or embodying the free anterior 

 border 21 



2. No red area on the abdomen or thorax 3 



Distinct red area covering one or more anterior abdominal terga and possibly 



extending onto the propodeum of the thorax 15 



3. Elevation on the surface of the clypeus a single, low, cone-shaped process 



with a pair of erect denticles below near the clypeal border 4 



Elevation scoop shaped, truncate, or double pointed 5 



4. Black with yellow markings vanduzeei vanduzeei Banks 



Black with cream markings vanduzeei cburnea ScuUen 



5. Clypeal process extended so that the length is equal to or greater than the 



width; often inverted scoop shaped 6 



Clypeal process either short and broad or otherwise modified 8 



6. Apical border of clypeal process smooth and straight with rounded corners. 



truncata Cameron 



Apical border of clypeal process sinuate, giving the effect of three slight 



extensions 7 



