106 PROCEEDINGS OF THE ACADEMY OF 



Small ; scutellum convex, sides abrupt ; metathorax -without spines ; 



antenna; % black, -n-ith a -white annulus 11. frivolus. 



Body honej'-yello-n' or ferruginous, slightly marked "uith black : 

 Ferruginous ; black band at base of third abdominal segment ; an- 

 tennae 9 black, -with -n'hite annulus and red nt base ; -n'ings 



yello-v\'-hj'aline ; posterior legs ferruginous 10. passivus. 



Ferruginous ; black band at base of second and third abdominal 

 segments ; -wings yellowish, banded -with fuliginous ; antenna', 



% 9 5 tricolored IG. cupidus. 



Ferruginous ; black band at base of second and third abdominal seg- 

 ments ; posterior legs mostly black ; -wings yello-wish, of 'J, 

 dusky at base and apex ; anteunoe, % 9 i tricolored. 



14. izucarus. 

 Ferruginous ; abdominal segments constricted at base ; -nings black- 

 ish, -with a broad submediau yello-sv band 15. arrogans. 



Body yello-w, abdomen entirely so : 

 Spots on vertex and occiput, a spot on anterior margin of mesothorax, 

 a line on each side over tegulse, and the antennae, black. 



13. citrinus. 

 Spot on vertex, mesothorax except four yellow stripes, and the an- 

 tennae, black ; thorax yello-w, legs and abdomen honey-yello-w. 



12. additus. 

 Body black ; abdomen yello"-, v:hh black band on third and fourth seg- 

 ments ; legs honej'-yello-w, apex of posterior femora black ; 



anteunse tricolored ; scutellum yello-w 45. placitus. 



Head and thorax black ; abdomen ferruginous : 



Head and thorax entirely black 2. meridionalis. 



Head and thorax marked more or less -with -white : 

 Metathorax -without spines : 

 Large ; scutellum perfectly tlat, margined with white ; metatiiorax 



entirely black 3. mexicanus. 



Small ; scutellum flat above, with two white spots, sides abrupt ; 

 meso- and metathorax entirely black ; abdomen short, ovate. 



4. totonacus. 

 Metathorax with two spines : 



Small ; scutellum flat, with two white spots ; mesothorax -with two 

 short white discal lines, and metathorax with two white apical 



spots ; abdomen short, ovate, immaculate 5. otomitus. 



Small ; scutellum rather flat, white ; mesothorax black ; metatho- 

 rax red ; abdomen % elongate, polished, more or less blackish 

 on three basal segments above ; of 9 immaculate. 



7. ciiriatus. 



Medium ; scutellum subconvex, sides abrupt, red at base, white at 



tip ; metathorax entirely red; posterior tibiae black, their tarsi 



white G. chiapus. 



