INVESTIGATION INTO HABITS OF THE CATTLE TSETSE FLIES. 153 



7. Does the fly-area contain Glossina morskans only or have you reason to 

 beh'eve that another species of tsetse is present as well? 



8. Does the size of the fly-area vary at diflferent times of the year, and if 

 so, is there a definite relation between these variations and the dry and rainy 

 seasons respectively or the prevalence of wind ? 



9. Are the limits of the fly-belt sharply defined, and if so, what is the 

 nature of the limiting boundaries ? 



10. Are there any natural features which are specially characteristic of 

 the fly-belt and which are not to be found in the surrounding fly-free areas 

 (e. g. nature of soil, bush, herbage, presence or absence of water) ? 



11. Are there any such features which you have specially noticed to be 

 present in every fly-belt you have visited? E.g.^ Does the presence of fly 

 in large numbers seem to be associated with that of sand ? 



12. Have you ever observed a tsetse-fly depositing its larva, and if so, can 

 you describe the circumstances? 



13. Have you observed any marked differences in the number of tsetses in 

 a particular area at different seasons? If so, describe these differences. 



14. To what do you attribute such differences ? 



15. Have you made any attempts to trap tsetses with pieces of black cloth 

 or paper worn by men or animals and smeared with bird-lime, and if so, with 

 what success? Have you tried any method of deterring the flies from biting 

 animals while passing through a fly-belt ? 



16. Do you know of any mammals, birds, reptiles, or predaceous or 

 parasitic insects which actually destroy tsetse-flies ? 



17. Are there, within your knowledge, any facts which lead you to believe 

 that tsetse-flies are entirely dependent for their continued existence upon the 

 blood of wild mammals ? 



18. Have you any reason to believe that tsetses are specially dependent 

 upon and associated with any particular species of mammals ? 



19. Have you ever observed tsetses feeding upon birds, lizards or 

 crocodiles ? 



20. Have you any reason to suppose that tsetses may be capable of 

 subsisting on the juices of plants or that they suck up water or dew ? 



21. Do you personally know any facts tending to show that tsetses move 

 about with big game either in the natural migrations of the latter or when 

 they are driven away, and return when or soon after the game returns ? 



22. Are you acquainted with any instance in which the appearance of 

 tsetses in a new locality has been due to the movement of natives ? 



23. Do you know personally of any cases of healthy domesticated animals 

 of any kind living at a Kafir kraal within a fly-belt ? 



BULL. ENT. RES. VOL. I. PART II. JULY IQIO. 



