EUEOPEAN MIGEANTS IN EAST AFEICA 101 
(4) Earthy olive brown cobra, length 5 feet. 
Note : Probably Naja nigricollis. 
(5) Green * mamba ’ — lives in trees to a great extent — 
length 5 feet. 
Note : Probably a green viper of genus Causus. 
The poisonous snakes of this country are not very well 
known, and it is hoped that members of the Society will devote 
some attention to the collection of specimens ; for the purpose 
of identification it is not necessary to send in the whole body 
of a snake, but the head and upper part of the neck should be 
sent in, in spirit ; but the length should be measured and a 
careful description of the body markings noted immediately 
after death ; the body should be skinned and the dried skin 
forwarded, or the skin can be left attached to the hood and 
placed in spirit with the head. 
It is very important that all residents should be able 
readily to identify all the poisonous reptiles of the country. 
EUEOPEAN MIGEANTS IN BEITISH EAST AFEICA 
By A. B. Pbrcival. 
Few subjects have interested naturalists more than the 
migration of birds, and it is only comparatively recently that 
it was accepted that birds migrated for any great distance. 
Even such a good naturalist as White of Selborne had doubts 
about the Swallows, and quoted cases of hibernating Swallows 
having been found in various places, though he admits that 
he never saw any himself. 
One can quite understand doubts being held as to the 
possibility of such weak -winged birds as the Willow- Warbler 
and Sedge- Warbler being able to cross even the English Channel, 
but the man who had told White that they actually travelled 
for 4000 miles to their winter resort would have been laughed 
at. Yet such is the case. One can easily understand such 
strong-winged birds as Swallows and Swifts travelling any 
distance, but that the small warblers that flit from tree to tree 
