560 PROCEEDINGS OF THE ACADEMY OF [Aug., 



11. Larger; second siibmarginal cell very broad below, and narrowed 



almost to a point above, so that the lower inner angle is very 



acute; tegulse dull yellow, coquilletti, Ckll, 



Smaller; second submarginal cell ordinary; basal nervure meeting 

 transverso-medial, or slightly basad of it, 12. 



12. First abdominal segment dark brown above, with a few light dots; 



apex entire; scape entirely dark, suhgracilis, CkW. 



First abdominal segment with a distinct light (yellow or reddish) 

 band, 13. 



13. Abdominal bands (except first) continuously light yellow; scape 



yellow in front ; apex of abdomen emarginate, subangusta, Ckll. 

 Abdominal bands ferruginous centrally on middle segments, yellow 

 laterally; scape yellow in front, 



rhodosoma, Ckll. (and other males?). 



[Females. \ 



Large species with yellow-banded abdomen, and bright ferruginous 



hair on thorax, rhodotricha, Ckll. 



Not so colored, and usually much smaller, 1. 



1. Abdomen black, with continuous light bands on the first two seg- 



ments at least, or the black reduced to bands ; a light spot before 



each upper corner of scutellum, 2. 



Abdomen red, without entire bands on first two segments, if any, 4. 



2. Mesothorax partly red ; scutellum red ; abdominal bands white, 



crotchii nigrior, Ckll. 

 Mesothorax black, 3. 



3. Larger; metathorax with large light patches, . . o-s/iweac/i, Ckll. 

 Smaller; metathorax without light patches, . formida, ^'iereck. 



4. Scutellum black, size small, 5. 



Scutellum red, size mostly larger, 6. 



5. Basal nervure ending a little before transverso-medial, almost join- 



ing it; size a little larger; abdomen with interrupted j^ellowish- 

 white bands, those on segments 3 and 4 deeply notched in front, 



marginella, Ckll. 

 Basal nervure ending a little beyond transverso-medial; abdomen 

 red without light bands, except two whitish spots or a band on 

 fifth segment ; apical part of abdomen suffused with black, 



elegantula, Ckll. 

 0. Abdomen with large yellowish- white markings, pointed mesad on 

 segments 1 to 3, forming entire bands on 4 and 5, 



daridsoni, Ckll. 

 Abdomen without such markings; basal nervure ending basad of 



transverso-medial, or rarely joining it, 7. 



7. Base of first abdominal segment black right across ; abdomen with 

 a purplish luster; segments 2 to 5 with lateral cream-colored 



spots, angelarum, Ckll. 



Base of first alxlominal segment not black riglit across, or without 

 black, 8. 



