[175] HYMENOPTERA 181 



10. All coxae black, the anterior sometimes testaceous at apex, rest 



of legs mostly black, with sutures of trochanters, tips of 

 femora, tibiae except hind pair, and the tarsi, except the 

 posterior, dark rufous, the middle and front tarsi with the 

 joints more or less fuscous basally ; first and second joints 

 of flagellum equal hardly or not more than thrice longer 

 than thick at apex. 



Metathoracic areola hexagonal but much -wider than long ; fovea at base 

 of scutellum smooth, without striae ; antennal joints 13 to 19 distinctly 

 longer than thick B. quadriceps. 



Metathoracic areola hexagonal but longer than wide ; fovea at base of 

 scutellum with striae ; antennal joints 13 to 19 hardly longer than 

 thick S. simulator, 



11. Antennae i8-jointed 12. 



Antennae 19-jointed. 



Legs black, with the sutures of trochanters apices of femora and tibiae 

 except the posterior at apex rufo-testaceous, tarsi black or fuscous, 

 the extreme tips of the anterior and middle tarsal joints (rarely 

 entirely) and the apex of the antennal pedicels testaceous. 

 First joint of the flagellum only two-thirds the length of the sec- 

 ond, joints 5 to 10 not longer than thick, the last oblong, thrice 

 as long as thick ; petiole of abdomen coriaceous or finely sha- 

 greened to the spiracles. Female B. simillima. 



12. Legs black, with the sutures of trochanters, tips of femora, the front 

 and middle tibiae and tarsi and the hind tibiae, except at apex, rufo- 

 testaceous ; third joint of antennae obconical, only a little longer than 

 thick at apex and much shorter than the fourth, joints 7-10 quadrate 

 or nearly. Female. (Male 22-jointed antennae.) B. confusa. 



13. Abdomen not entirely red, always black at base and apex.... 14. 

 Abdomen, except sometimes the petiole or the petiole at 



base, entirely red or ferruginous 24. 



14. Abdomen with dorsal segments 2 and 3 and sometimes 4, 



or at least basally or in the sutures, red 22. 



Abdomen quite differently marked, dorsal segments 2 and 

 3 never both red jr. 



15. Antennae 23-jointed or less 17. 



Antennae 24-jointed. Male. (Female 20-jointed) 16. 



16. Abdomen with the second suture and extreme apex of the segment, and 

 the base of third segment or the third wholly testaceous or dark 

 rufous ; rarely with base of fourth segment red ; first and second 

 joints of flagellum equal or very nearly, the penultimate joint very 

 distinctly longer than thick B. rubrocincta. 



