494 Rev. K, St. Aiibyn Rogers' Bionomic Notes on 



which is on the eastern slopes of the Rift Valley and a 

 fine forest country. 



Most of my collecting, however, was done in Northern 

 Kikuyu at a place called Weithaga (GOOO ft.), about 15 

 miles due west of Fort Hall, and perhaps 60 miles north 

 of Nairobi. 



The country consists of a series of long ridges with 

 very steep narrow valleys between them, running down to 

 the plain from Mount Kinangop. Most of these valleys 

 are swampy, but tliey are often well cultivated, as indeed 

 is the whole country, the population being very large and 

 entirely dependent on agriculture. Woods arc few and 

 the whole country is very open. 



I also did a little collecting at Mogoiri (6500 ft. to 

 8000 ft.), which is a large district to the west, at a 

 somewhat higher elevation, rising in its western part 

 towards the slopes of Kinangop : also at Tuso (8000 ft.), 

 lying still further west and even higher up on Kinangop. 

 This last locality is, in part, low forest. 



The rainfall throughout this whole area is fairly high, 

 for such a cool country, amounting to some 50 inches, and 

 the land is never really dried up. Green grass is plentiful 

 even during the hot dry season, so that seasonal forms are 

 not well pronounced. I succeeded in breeding a species 

 of Precis, P. archesia, Cram., but all my specimens were 

 but little removed from the full wet season phase. Both 

 forms of Precis sesamus, Trim., are, on the other hand, well 

 marked and abundant. 



The material illustrating all parts of this paper exists 

 in the Hope Department of the Oxford University Museum, 

 where the authorities will always be glad to make it 

 available for the study of Naturalists interested in the 

 subject of insect bionomics. 



A. Danaine-centred mimetic combinations. 



Although, so far as I am aware, the mimetic Pcqnlio 

 rex, Oberth., has not as yet been taken in the Taveta and 

 Taita districts, it is of interest to observe that the model, 

 Tirumala {Melinda) formosa, Godm., certainly occurs there. 

 I have had one specimen brought to me at Taveta, and 

 on the journey from Voi to Taveta in 1905 I saw several 



