INTRODUCTION OF FOREIGN SPECIES. 161 



Upper Canada ; and, if we may judge by the climate 

 and physical characters, they must be as abundant there 

 as in the northern parts of the United States. But, as 

 we are not able to particularize species, or their local- 

 ities, or the extent of their range north of Lake Erie, 

 we have omitted them in the table. The few species 

 known to extend north of the St. Lawrence River, are 

 included in it. 



We are aware that no important deductions can be 

 drawn from this table in its present imperfect condition, 

 and therefore offer it with some hesitation. But as the 

 facts which would go to complete a table of this kind, 

 must necessarily be collected before we can determine 

 with accuracy the species which are Indigenous to the 

 United States exclusively, we have thought it expedient 

 to furnish the outline, in the hope that others would, ere 

 long, provide the materials for filling it up. It is also 

 not improbable that some of the species, now supposed 

 to be identical with extra-limital ones, may prove to be 

 different. The same facts might also have an important 

 bearing upon the question of the local origin of the sev- 

 eral species. For the species contained in the table, 

 we have given such authorities as are known to us ; 

 where none are named, we have relied either upon our 

 own personal knowledge, or upon the information of per- 

 sons whose accuracy we could not doubt. 



VOL. 1. 20 



