436 Mr. It. E. Turner on Fossorial Hymenoptera. 



Abdominal fasciae narrow and pale ; sixth 

 ventral segment not emarginate, 

 seventh dorsal segment not sinuate at 

 the sides B. cursitans, Handl. 



19. Sixth ventral segment with a raised, 



flattened, triangular tubercle 20. 



Sixth ventral segment with a low longi- 

 tudinal carina 2o. 



20. Clypeus pure white, with a black basal 



fascia, subconcavely truncate ante- 

 riorly ; apical joint of antennae 

 strongly bent and pointed, tbree sub- 

 apical joints strongly spined B.Jlaoipes, Sm. 



Clypeus and antennae differing from the 

 above characters 21. 



21. Tubercle of second ventral segment not 



much curved, broadly truncate at the 



apex 22. 



Tubercle of second ventral segment 

 strongly curved, pointed at the apex . 23. 



22. Abdomen yellow beneath ; basal joint 



of the anterior tarsi witb eight spines. B. tuberculiventris, Turn. 

 Abdomen black beneath; basal joint of 



the anterior tarsi with six spines .... B. madkayensis, Turn. 



23. Clypeus, scape beneath, and legs almost 



entirely yellow B. littoralis, Turn., var. 



Clypeus and legs mostly black, scape en- 

 tirely black 24. 



24. Eighth and ninth joints of the antennae 



prominent behind B. musca, Handl. 



Eighth and ninth joints of the antennas 



not prominent B. littoralis, Turn. 



25. Seventh dorsal segment broadly rounded 



at the apex ; abdomen entirely black . B. leemoinensis, Turn. 



Seventh dorsal segment narrower, trun- 

 cate at the apex, or feebly emarginate. 2G. 

 2G. Abdominal fasciae interrupted, not very 



broad B. variabilis, Sm. 



Abdominal fasciae continuous, very broad. B. raptor, Sm. 



??• 



1. Basal joint of the fore tarsus with twelve 



or more spines 2. 



Basal joint of fore tarsus with six to eight 

 spines 3. 



2. Clypeus and labrum with a deep longi- 



tudinal groove on each side B.Jlavifrons, Sm. 



Clypeus almost, labrum quite without 



grooves B. pectinipes, Handl. 



3. Discal area of the mesonotum marked 



with yellow 4. 



Discal area of the mesonotum without 

 yellow markings 11. 



4. Sixth dorsal segment with yellow mark- 



ings 5. 



Sixth dorsal segment entirely black .... 10. 



5. Abdominal fasciae very broad, occupying 



at least half the length of the segment. 6. 



