504 REPORT OF THE 



trout. The adults are known to English fishermen, in addition to the general com- 

 mon name given above, as the red fly (Old Joan) and the willow fly (Shamrock fly), 

 according to Prof. Miall. They are also known as Duns in this country. These 

 insects were not very common at Saranac Inn as most of the water in that region 

 was not rapid enough for them. 



Cliloropcrla bilincata Say. This species had begun to disappear by June 15th, 

 though a few could be found about the hatchery windows each day. Many dead 

 ones were also discovered entangled in spider webs, and adults were not observed 

 flying except from the place of transformation to the window. Empty nymphal 

 skins were very abundant, and hundreds were to be found sticking to the sides 

 of the hatchery troughs, the greatest number near the inflow pipe. 



Lciict?'a tcuclla Pro v. This form, the adult of which is shown at plate i, figure 

 12, was much less common than the preceding one, and adults were not observed in 

 flight. A few were taken on the hatchery windows, some on aquatic vegetation 

 close to the water and others under boards overhanging the water near the railway 

 embankment where there is a little ripple. In this last mentioned place nymphs 

 were found crawling over the surface of stones and boards among the brown and 

 empty cases of Siuiuliiun pupae. 



i^EpJieiiieridcE) 



The May-flies, or Ephemeridae, are very common insects along the banks of 

 streams and beside bodies of water. They are known to fishermen as drakes, 

 including the green and other varieties. Other fishermen's names common in Eng- 

 land as listed by Prof. Miall are as follows: March Brown, Great Red Spinner, 

 Yellow Dun, Iron Blue Dun, Jenny Spinner, Little May Yellow Dun, Sky Blue, 

 Orange Dun, Dark Mackerel, Pale Evening Dun, Whirling Blue Dun, July Dun and 

 August Dun. The May-flies are readily recognized by their delicate structure. 

 The very slender body is tipped posteriorly by two or three long, many-jointed fila- 

 ments. The wings are many veined, the hinder pair being either much smaller than 

 the fore pair or entirely absent. A glance at plate 2 will enable anyone to recognize 

 the May-flies, as all the species have a very characteristic appearance. 



It is popularly supposed that these insects live but a few hours or a day, and this 

 is undoubtedly true of some forms, but others have an adult existence extend- 

 ing over a longer period. The eggs are deposited by some species on the surface 

 of the water and by others on stones beneath the water. A note regarding the 

 prolificacy of one form, Heptagcnia pulcliella Walsh, may be of interest in this con- 



