. Bulletin of entomological research. Entomology. INVESTIGATIONS INTO THE BIONOMICS OF GLOSSINA PALPALIS. 429 that the fly population was not permanently resident, but was continually moving, and that virtually all flies infesting it at a given time were likely to move away from it in the course of a day or two, to be replaced by others. On Kizima the flies have not this privilege. They must remain on the islet and put up with whatever shelter it affords, or leave it permanently. If Kizima were a peninsula of Bulago, like Crocodile Point, its light shelter and breeding grounds, and the great q
. Bulletin of entomological research. Entomology. INVESTIGATIONS INTO THE BIONOMICS OF GLOSSINA PALPALIS. 429 that the fly population was not permanently resident, but was continually moving, and that virtually all flies infesting it at a given time were likely to move away from it in the course of a day or two, to be replaced by others. On Kizima the flies have not this privilege. They must remain on the islet and put up with whatever shelter it affords, or leave it permanently. If Kizima were a peninsula of Bulago, like Crocodile Point, its light shelter and breeding grounds, and the great quantity of food it provides, would certainly attract to it even more flies than infest Crocodile Point; but it must be concluded that its heavy infestations under such hypothetical conditions, like the heavy infestation actually existing on Crocodile Point, would be, as the other certainly is, due to the existence of good massive shelter within range or reach of the flies infesting it. These same facts concerning the movements of flies along shore, or along other favourite courses, answer also the first objections made above. The active flies are active with some positive object; the females are seeking either food or breeding places; the males are seeking either food or association with the females. Light shelter provides the best shade for breeding places, and food (Varanus and crocodile especially) is most frequently encountered associated with it; therefore it is sought by the females and equally by the males during their hours of activity. At other times (during the night, storms and dull weather generally), both sexes remain in seclusion, and it is then that massive shelter is presumptively necessary for their protection. A large number of data collected during the course of the survey of small islands sustained this as the true explanation for lightness or absence of infestation on a fair number of them. The data are of a sort not easily presented, and Table XXXIII is su
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