]\Ir. 1\. E. 'runiev on Fossorial Ilymenoptera. 437 



Abdominal fascias uarrower 9. 



G. Sixth dursiii segment with a large median 



siiot 7. 



Sixth dorsal segment with a spot on each 



side 8. 



7. Sixth dorsal segment broadly rounded 



at the apex B, lohimana, Ilaudl. 



Sixth dorsal segment narrowly rounded 



at the apex B. mcusttpiata, Flandl. 



8. Second ventral segment entirely yellow . B. latifasciata, Turn. 

 Second ventral segment black in the 



middle and at the base B. raptor, Sm. 



9. Abdominal fasci* continuous B.fldoiventris, Sm. 



Abdominal fascise narrowly interrupted . B.Jiaxiipes, Sm. 



10. Tibife entirely yellow; basal joint of 



fore tarsus with seven spines. Large, 



17 mm. iu length B. palmata, Sm. 



Tibite with broad black line ; basal joint 

 of fore tarsus with six spines. Smaller, 

 13 mm. in length B. littoralis, Turn., var, 



11. Third and fourth dorsal segments en- 



tirely black, first wilb a broad fa.«cia . B. vespiformis, Sm. 

 Third dorsal segment at least with a 

 fascia, when the fourth is entirely 

 black, then the first also without a 

 fascia 12. 



12. Clyjieus and labrum entirely black .... 13. 

 Labrum at least yellow 14. 



13. I'horax entirely black B. leeuwinensis, Turn. 



Thorax with lateral yellow spots on 



mesonotiim and scutellum B. severa, Sm. 



14. Clypeus entirely black B. atrifrons, Sm. 



Clypeus at least partially yellow 15. 



15. Eyes strongly convergent above, second 



ventral segment with a low carina 



from the base B. cursitans, Haudl. 



Eyes not strongly convergent above .... 16. 



16. With a small yellow spot on each side of 



the anterior ocellus. Length never 



exceeding 15 mm 17. 



"Witbout a yellow spot on each side of 

 the anterior ocellus. Length always 

 exceeding 15 mm B. furcata, Erichs. 



17. Third cubital cell distinctly longer on 



the radius tban on the cubitus B. variabilis, Sm. 



Third cubital cell no longer on the radius 



than on the cubitus, if as long B. mackayensis, Turn. 



I have uot seen B. lamellata, Handl., so cannot include 

 the female in my key. The species of the musca group are 

 so close that I cannot tabulate the females on the insufficient 

 material available. Some of the species of this group appear 

 to have the spines of the fore tarsi much more strongly 

 spatulate than others ; colour is very variable and uot 

 reliable in distinguishing these species. 



