WASP GENUS CERCERIS — SCULLEN 351 



26. Length 14 to 15 mm. (North Central States) stigmosalis Banks 



Length 9 to 10 mm 27 



27. Propodeum immaculate (Northern States from coast to coast). 



nigrescens nigrescens F. Smith 

 Propodeum with large white patches 28 



28. Enclosure smooth (eastern slope of the Rocky Mountains). 



calochorti Rohwer 

 Enclosure more or less coarsely ridged (southern California) . 



macswaiiii Scullen 



Group I 



1. Showing shades of ferruginous or red on the first abdominal tergum and 



bordering areas 2 



Colors black with yellow, white, or cream markings only, no ferruginous or 

 red markings 6 



2. Markings creamy white or white 3 



Markings yellow 5 



3. Terga 2, 3, and 4 with broad bands of creamy white, in some specimens 



the fourth showing slight emargination; punctation sparse (known only 



from southern California and southern Arizona) . . . bridwelli Scullen 



Wide bands on terga 2 and 3 only, or aU bands subequal and of medium 



width; punctation crowded or average 4 



4. Bands on terga 2 and 3 broad medially but narrowing laterally, bands on 4 



and 5 narrow; punctation medium (known only from southwestern Arizona 



and southern Texas) crotonella Viereck and Cockerell 



Bands on terga 2 to 6 subequal and of medium width; punctation crowded 

 (general over western arid sections but more common in the Southwest). 



conifrons Mickel 



5. Band on tergum 2 with a deep V-shaped emargination, bands on terga 3 to 



6 broad but deeply emarginate and often completely divided (extreme 



Southeastern States) blakei Cresson 



Band on tergum 2 broad and with little or no emargination, bands on terga 



3 to 6 of medium width with broad and moderately deep emarginations 



(recorded from most states except the New England States, the Great 



Lake Area and the extreme Southeast) . . . rufinoda rufinoda Cresson 



(also echo echo Mickel ;8 argia Mickel and irene Banks, when recognized, 



probably will run to this couplet also) 



6. Markings on tlie abdomen creamy 7 



Markings on the abdomen yellow 12 



7. Propodeum with medium patches of creamy white; usually two small spots 



near the apex of the enclosure; first tergum cream except for a black patch 

 at the base (southern Arizona, New Mexico, and Texas). 



truncata Cameron 



Propodeum and enclosure immaculate; tergum 1 either immaculate or with 



only a small cream patch on the dorsum 8 



8 The males of rufinoda rufinoda Cresson and echo echo Mickel so far are indis- 

 tinguishable except as they are associated with the females. Some specimens of 

 males taken at the same time and place as some females of echo echo Mickel are 

 more cream than the males usually accepted as the males of rufinoda rufinoda 

 Cresson. These forms with lighter markings may prove to be the males of echo 

 echo Mickel, 



