l8o ASHMEAD 



5. Antennae 22-jointed or less 6 



Antennae 23-jointed. (Female i9-jointed.) 



Legs black, with the sutures of trochanters, front and middle legs except 

 femora basally, tips of hind femora and their tibiae, except apex, rufo- 

 testaceous B. simillima. 



6. Antennae 2 1 -jointed. Male 7. 



Antennae 22-jointed. Male. (Female iS-jointed.) 



Legs, except the anterior coxae basally, the middle and hind coxae, bases 

 of front and middle femora and hind legs, except basal two-thirds of 

 tibiae which are black, ferruginous ; abdomen with usually more or 

 less of the third dorsal segment red, or the apex of the second and the 

 base of the third segments are reddish. Male B. confusa. 



7. Legs black with the sutures of trochanters, apices of femora, all tibiae, 

 except the hind pair at apex, and the anterior and middle tarsi more 

 or less testaceous ; first and second joints of flagellum subequal, the 

 first slightly the longer with a pale annulus at base, about 3^ times 

 as long as thick ; abdomen longer than the head and thorax united, 

 the petiole finely rugulose to a little beyond the spiracles. Male. 



B. ungce. 



8. Antennae less than 2O-jointed n. 



Antennae 20- jointed. 



Females 9. 



Males 10. 



9. Legs black, with the sutures of the trochanters, apices of femora (the 

 anterior usually entirely beneath), and the tibiae, except the posterior 

 at apex, dark rufous, the tarsi black or fuscous ; pedicel testaceous at 

 apex ; metathoracic areola hexagonal, fully as long as wide or a little 

 longer ; first joint of flagellum only about two-thirds the length of the 

 second, the third only a little shorter than the second, joints 5 and 

 those beyond to the last, not, or scarcely, longer than thick, the last 

 oblong B. nigricornis. 



Legs black with the apex of front coxae, their femora, except slightly at 

 base above, their tibiae and tarsi, second joint of middle and hind 

 trochanters, apices of their femora, middle tibiae and tarsi and hind 

 tibiae, except at apex, rufo-testaceous ; pedicel and first joint of flag- 

 ellum at base, rufo-testaceous ; metathoracic areole hexagonal, a little 

 wider than long. 



First joint of flagellum about two-thirds the length of the second, the 

 third only a little shorter than the second, joints 7 and 8, a little 

 thicker than long, the following to the last a little longer than 

 thick, the last joint oblong; petiole finely coriaceous B. imitator, 



First joint of flagellum only a little longer than thick at apex, usually 

 two-thirds the length of the second, joints 5 and 6 quadrate, the 

 following to the last a little longer than thick, the last oblong, 

 nearly thrice as long as thick ; petiole coriaceous to the spiracles 

 and along the sides to beyond the spiracles B. simulans. 



