LUKALU— ISENTWA 111 



clelia. Glossina averaged 10- 6 per boy-hour. There is a 

 small accessory islet to the east of Lukalu, separated 

 from the main isle by about 50 yards of water ; it measures 

 about 100 by 50 yards, and is composed of red rock broken 

 up into pebbles on its surface. There was a variety 

 of flowering plants and low bushes at one end, and 

 many ambatch trees, among which a species of moor- 

 hen was noted. Weaver birds, sunbirds and wagtails 

 were plentiful. 



The only butterflies noted on this accessory islet were 

 the Lycaenid T. telicanus, which was evidently much 

 attacked by wagtails, for a large proportion had a 

 A -shaped piece taken symmetrically out of the two hind 

 wings. 



On February 16th we visited Isentwa Isle, which is 

 roughly triangular, having sides about three hundred 

 yards long. 



It is composed almost entirely of grass land, with a 

 narrow fringe of bush or cane at those parts of the coast 

 where the rock is not too steep. Enswa-swa were noted 

 abundantly, but no crocodiles were seen ; indeed, as a 

 whole the islands of this group had very few crocodiles. 



Big spiders were absent from Isentwa, and also Glossina ; 

 butterflies were very few, the feature being abundance 

 of the woolly-legged Lycaenid Lachriocnema bibulus, of 

 which at least half a dozen individuals arose together 

 from one plant as I passed. The only Nymphaline seen 

 was Precis archesia. 



KiuwA Island was visited on February 19th, and proved 

 to be remarkably interesting from the point of view of 

 the bionomics of Glossina, which was found to the extent 

 of 18-2 per boy-hour, and yet we could not make out where 

 were the pupae which kept the numbers at this level. 



Search as we would, no more than an average of 3* 3 

 pupae could be found per boy-hour, in spite of rewards 

 offered. 



