168 U.S. NATIONAL MUSEUM BULLETIN 27 7 



5. Abdomen brown or orange 6 



Abdomen brown grading to tan, posteriorly 7 



6. Abdomen brown with white posterior bands; 8th tergum with 7 spines 



B. arnaudi, new species 

 Abdomen orange; 8th tergum with 7 spines and much hair 



B. dicksoni, new species 



7. Eighth tergum with 8 spines and a dorsal pit . . . B. boharti, new species 

 Eighth tergum with 6 spines B. schlingeri, new species 



8. Halter knob tan 9 



Halter knob orange, 8th tergum with 8 spines . . . B. davisi, new species 



9. Halter knob tan above cream below, 8th tergum with 8 spines and a ventral 



pit B. beameri, new species 



Halter knob entirely tan, 8th tergum with 9 short stiff spines 



B. halli, new species 



10. Wing smoky white 15 



Wing smoky brown 11 



11. Halter knob tan 12 



Halter knob cream, abdomen with red-brown "T"s; 8th tergum with 6 spines 



and much hair B, coquilletti, new species 



12. Halter knob lighter below 13 



Halter knob all tan, abdomen dark red-brown; 8th tergum with 1 dorsal 



spine and 7 pits B. hodgdeni, new species 



13. Halter knob cream below 14 



Halter knob white below; 8th tergum with 7 spines . B. griflSni, new species 



14. Abdomen brown; 8th tergum with 8 spines . . . B. melanderi, new species 

 Abdomen red-brown with white lateral patches grading to all red-brown; 8th 



tergum with 4 spines B. yucatani, new species 



15. Halter knob yellow-brown, cream or tan 16 



Halter knob white, 8th tergum with 9 spines and a ventral tuft of hairs 



B. insulana (Cole) 



16. Halter knob cream or tan 17 



Halter knob yellow-brown, 8th tergum without spines but with 8 pits 



B. aspinosa, new species 



17. Halter knob cream or tan 18 



Halter knob tan ; abdomen red-brown, 8th tergum with 5 spines 



B. ordwayi, new species 



18. Halter knob entirely cream 20 



Halter knob cream with tan lateral bands 19 



19. Abdomen brown with white lateral patches, 8th tergum with hair only 



B. addacifons, new species 



Abdomen with red-brown "T"s grading to yellow-brown, 8th tergum with 



6 spines B. timberlakei, new species 



20. Abdomen brown grading to tan or with red-brown "T"s 21 



Abdomen black and white or red-brown and white bands 22 



21. Abdomen brown grading to tan; 8th tergum with a fringe of hair only 



B. minuta, new species 



Abdomen cream with red-brown central "T"s grading to orange posteriorly; 



8th tergum with 7 spines and very short hair . . . B. kerni, new species 



22. Abdominal segments red-brown with white posterior bands; 8th tergum with 



6 spines B. scitulaesca, new species 



Abdominal segments black with white posterior bands; 8th tergum with 

 8 spines B. griseola (Coquillett) 



