An. das Mem. do Instituto de Butantan — Vol. 1 - fasc. 1 (Ofiologia) 81 
to my great surprise, I verified that not only the properties, but 
above all the toxic activity of the same was very different from, 
that of the poison of other Brazilian Lachesis. 
Encouraged by these preliminary results, I resolved to make 
a visit to the Queimada Grande Island and there to study the 
biology of the new species. 
As will be seen in Part II of this article, Lachesis insularis 
lives exclusively on trees and shrubs, and feeds on birds. It is 
therefore the first Crotalinea found im Brazil which is simul- 
taneously avivorous and tree living. 
