108 FLOATING FLIES 



ficiently familiar to warrant discussion, are very 

 interestingly given by Prof. Vernon L. Kellogg 

 in his book, to which I have previously alluded, 

 " American Insects," a volume, by the way, in- 

 valuable to the tentative American dry fly fish- 

 erman. (Published by Henry Holt & Com- 

 pany, New York.) 



" So it was that my first summer's camping 

 and climbing in the Rockies acquired a special 

 interest from the slight acquaintanceship I 

 then made with a group of insects which, un- 

 fortunately, are so little known and studied in 

 this country that the amateur has practically 

 no written help at all to enable him to become 

 acquainted with their various kinds. These in- 

 sects are the caddis flies; not limited in their 

 distribution by any means to the Rocky Moun- 

 tains, but found all over the country where 

 there are streams. But it is in mountain 

 streams that the caddis flies become conspicu- 

 ous by their own abundance and by the scarcity 

 of other kinds of insects. 



" In Europe the caddis flies have been pretty 

 well studied and more than 500 kinds are 

 known. In this country about 150 kinds have 

 been determined, but these are only a fraction 

 of the species which occur here. Popularly the 

 adults are hardly known at all, the knowledge 



