( vi ) 



others henceforth possibly to become established. Introduced species 

 are distinguished by spaced type; and the few which are known a^ yet 

 only at a single station, though sometimes already abundant there, are 

 also enclosed within brackets. 



Some corrections and additions will be found at the end. 



E. T. 

 Amherst, 



10 July, 1875. 



