WASP GENUS CERCERIS — SCULLEN 347 



24. Markings silvery white; tegula smooth, not elevated. 



finitima vierecki Banks 

 Markings yellow; tegula elevated and pitted 25 



25. Bands on terga narrow and deeply emarginate; propodeum black, immacu- 



late; occiput black except for small yellow spots back of the compound 



eyes finitima finitima Cresson 



Yellow markings greatly extended; yellow bands on terga wide with little 

 or no emargination; considerable yellow on the propodeum and occiput. 



finitima citrina Scullen 



Group II 



1. Enclosure surface deeply ridged at 45" angle to base 2 



Enclosure surface not ridged 4 



2. Pygidium with sides converging uniformly to a narrow apical point; length 



20 mm 3 



Pygidium pyriform with sides concave on the apical half; length 14 to 15 mm. 



completa Banks 



3. Yellow with very limited amber markings, very little or no black. 



grandis grandis Banks 

 Black with yellow markings grandis percna Scullen 



4. Abdomen black with one complete, wide ivory band on second tergum. 



fumipennis Say 



Abdomen largely yellow, light amber, or with light bands on more than one 



tergum 5 



5. Posterior half of abdomen (from center of third tergum) brownish yellow; 



thorax black except for broken band on pronotum and metanotum . . 6 



Thorax largely black or amber yellow; yellow bands on all terga or abdomen 



all yellow 7 



6. First and second abdominal segments black . . dilatata dilatata Spinola 

 First abdominal segment reddish, second tergum with a limited amber yellow 



patch and red shading dilatata chisosensis Scullen 



7. Black with yellow markings, little or no amber. 



californica californica Cresson 



Head and thorax light amber marked with yellow; abdomen largely yellow 



or with some light amber californica arno Banks 



Group III 



1. Clypeal process broad and lunar or crescent shaped with the free margin 



subequal to the process in width 2 



Clypeal process narrowing to a margin apically subequal in width to one- 

 half the width of the process 7 



2. Process with an undivided short but continuous lamella extending over 



nearly the entire margin of the process mandibularis Patton 



Lamella of process divided into two distinct oval lobes 3 



3. Process equal to approximately two-thirds of the distance between the 



eyes 4 



Process equal to about seven-eighths of the distance between the eyes . . 6 



4. Amber and yellow markings cochisi Scullen 



Black and yellow markings * 5 



