NEED OF FURTHER RESEARCH. 407 



defined and very restricted country, never crossing its limits, 

 consequently occupying a position of isolation with, regard to 

 their kindred, cannot be explained without special investiga- 

 tions, which, do not lie within the range of these general 

 observations, and which will be better worked out in the light 

 of later notes concerning the distribution of individual genera. 



