NATURAL SCIENCES OF PHILADELPHIA. 151 



3[etatliorax without lateral tubercle or spine : 



Metathorax black above, with au elongate, subtrefoil, white mark ex- 

 tending to apex 9. chichimecus. 



Metathorax black above, with two white spots near base, and an 

 elongate, median, white spot dilated at apex ; second abdominal 



segment with a white dot on basal middle 10. admirandus. 



Metathorax black above, with an arcuate white line at apex ; poste- 

 rior femora bivittate with black ; sciitellum black at tip. 



11. arcuatus. 

 Metathorax black above, with a large quadrate white mark on pos- 

 terior face, inclosing a small quadrate black spot, there is also three 

 small white marks on basal margin posterior coxse with a black 

 stripe or elongate spot above, their femora with a black stripe 



above 13. admotus. 



Mesothorax with two short white discal lines : 



Metathorax with three black stripes connected by a broad black band 



at base ; legs luteous, all the femora black above. 13. niexicaiius. 



Metathorax as in mexkanus ; posterior legs black, their coxne Avhitish, 



with a large black spot above, their femora reddish on basal half, 



and most of their tarsi white ; antenruB entirely black except scape 



heneutli 14. lassatus. 



Metathorax as m mexicanus ; legs fulvous, tarsi whitish tipped with 



black 15. moratus. 



Metathorax as in mexicanus^ with basal band narrow and inclosing a 

 white spot on each side ; legs as in moratm ; second abdominal 

 segment with an elongate white spot on basal middle. 



16. absoliitus. 



Metathorax with a broad central stripe, sometimes dilated anteriorly, 



not reaching basal suture ; legs fulvous, posterior tarsi white, black 



at base and apex 17. accolens. 



Metathorax with a subcruciform black mark, the posterior stem broad, 

 the cross-piece triangular, the anterior stem narrow and reaching the 

 basal suture ; legs fulvous, posterior tarsi white, black onlj^ at tips. 



18. novatus. 



Mesothorax with a white line on each lateral lobe, and a white spot on 



each side of middle lobe, which is prominent and grooved medially. 



19. stupidus. 



Mesothorax with a central white stripe 20. abactus. 



Mesothorax black, immaculate. 

 Metathorax broadly black at base, with three broad black stripes to apex ; 

 posterior femora rufous, black at base and apex, their tibite fulvous, 



their tarsi yellow 21. admonitus. 



Abdomen mostly reddish : 

 Metathorax black and white : 



Abdomen yellowish-red, sometimes black at base 22. incertus 



Abdomen yellowish-red, with whitish bands 23. animatus. 



