PREFACE. V 



In conclusion, I wish to thank the collectors mentioned for their 

 industry and material assistance. Especial thanks are due Dr. Kind-, 

 berg for his gratuitous and unremitting labors in examining between 

 5,000 and 6,000 specimens from 1887 to the present time. Indeed 

 without his assistance the work could never have been don<L s 

 thoroughly and completely. 



JOHN MACOUN. 



Ottawa, June 16th, 1892. 



