NATURAL SCIENCES OF PHILADELPHIA. 169 



Genus HEMITELES, Grav. 



Abdomen black, banded with white. 

 Thorax black, marked with white. 

 Form short, robust; metathorax rather abruptly truncate behind, tuber- 

 cles short and blunt ; first abdominal segment white, with a black 



spot before apex 1. lascivus. 



Form elongate, slender ; metathorax gradually sloping behind, tuber- 

 cles short and blunt ; first abdominal segment black or red, white at 



apex 2. patruelis. 



Form long, linear and very slender ; metathorax without tubercles ; 



hind coxse red 3. exilis. 



Form slender ; metathorax without tubercles ; abdomen clavate ; hind 



coxae white, black above 4. rarus. 



Thorax ferruginous, mesothorax black above ; abdomen black, with a 

 white spot at apex and a pale band at base of third segment. 



5. irritatus. 



Thorax entirely ferruginous ; wings hyaline 6. ingenuus. 



Thorax entirely ferruginous ; wings hyaline, with two fuscous bands. 



7. adjicialis. 

 Abdomen white, banded with black ; mesothorax black, with two white 



stripes 8. adultus. 



Abdomen white and honey -yellow, with one or more black bands. 

 Metathorax without tubercles. 



Mesothorax with two short white lines ; metathorax with two oval 



white spots behind 9. bimaculatus. 



Mesothorax with a central white spot ; metathorax white, black only at 



base 10. centralis, 



Metathorax with tubercles or spines. 

 Tubercles short, broad and blunt ; abdomen honey-yellow, whitish at 

 apex of first and second segments, and a blackish band at base of 



third segment 11. junctus. 



Tubercles rather long and subacute; abdomen ferruginous, first seg- 

 ment black, base and apex white, also two apical segments, base of 



second black 12. scitulus. 



Abdomen ferruginous and white. 

 Head and thorax black ; collar, spot on scutellum and on apex of abdo- 

 men white ; metathorax entirely black 13. monilis. 



Head and thorax black, marked Avitli white ; metathorax ferruginous, 

 with two white spots behind ; apex of first, narrow apical margin of 

 second and apex of two apical segments white ; apex of wings dusky. 



14. admirabilis. 

 Head and thorax black marked with white ; metathorax black, the fianks 

 and two spots behind white; apex and spot on each side at tip of 

 second segment white, base of first and second segments dusky. 



15. sulsus. 

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