REPORT OF THE STATE ENTOMOLOGIST I907 1 57 



of his study of these insects are reserved for pubHcation in a sepa- 

 rate bulletin. I studied mainly stone flies. The results of my work 

 on this group I have reserved for a future bulletin. The largest 

 present gaps in the knowledge of the immature stages of aquatic 

 insects will be filled "when these two groups are reported upon; but 

 since these are omitted from present consideration, it is only some 

 supplementary studies the results of which are included in the 

 present brief report; namely, some additions to our knowledge of 

 Ephemeridae and Diptera and some new studies of the food and 

 foraging grounds of fishes. • 



Localities and methods 



Old Forge, as is well known, is situated at the outlet of the Fulton 

 chain of lakes. It has about the same altitude as Saranac Inn (a 

 little more than 1700 feet) and is like the latter place in being 

 surrounded by low densely wooded mountains and hills with lakes 

 and ponds occupying valleys between ; but it differs in some minor 

 particulars affecting its fauna. It is on the St Lawrence side of 

 the Adirondack drainage system, while Saranac Inn is on the Cham- 

 plain side [see accompanying map]. It is at the outlet of a chain 

 of lakes where a small river breaks into rapid descent over rocky 

 beds, while Saranac Inn is at the head of a similar chain where 

 streams are slow and sinuous, with sandy beds and sphagnum bor- 

 dered banks. The differences in fauna are not very marked. Old 

 Forge is richer in the species that live in rapidly flowing water, 

 having an abundance of stone flies and current-inhabiting caddis 

 flies. Saranac Inn is richer in lake and pond species, especially in 

 dragon flies. We collected chiefly from Moose river and Old Forge 

 pond because of their proximity to our laboratory, and from Bald 

 Mountain pond and Beaver Meadow brook because of their very 

 fine faunas. The characteristics of our collecting grounds are 

 worthy of more detailed statement. 



Moose river. The hatchery being located directly upon the 

 bank of Moose river [pi. 4] and a stone's throw below Old Forge 

 pond, we naturally visited these bodies of water most frequently. 

 Moose river was disappoint'.ng. Often in passing on the old Adiron- 

 dack railway I had seen its dark waters dashing over the rocks in 

 its channel and had imagined it would be a paradise of stone flies ; 

 and such it may have been in times past, but since the construction 

 of the dam and controlling works at the outlet of Old Forge pond, 



