590 NEW YORK STATE MUSEUM 



EXPLANATION OF PLATES 



PLATE 1 



Oatlet of Little Clear pond ; view, looking northward from the railroad. 



Photo by J. G. Needham 



PLATE 2 



Little Clear pond ; view from the outlet, looking toward Green hill : St Regis 

 mountain iu the distance. Photo by J. G. Xeedham 



PLATE 3 



Little Clear creek on the grounds of the Adirondack hatchery; looking down 

 stream from the railroad. Photo by C. Betten 



PLATE 4 

 Little Clear creek just below the hatchery. Photo by K. C. Spears 



PLATE 5 



Little Clear creek at the edge of the woods below tbe hatchery; cages, nets 



and trap lantern. From the bare strip partly occnpied by a single screen cage 



in the foreground the first quantitative study detailed in part 2 was made. 



Photo bv J. G. Xeedham 



PLATE 6 



Little Clear creek on the hatchery grounds, looking toward the railroad. 

 Prom the boarded bank of the pool in the foreground the dragonfly exuviae 

 were collected for the count recorded in part 2. Photo by J. G. Needham 



PLATE 7 

 View across Little Bog pond, from the •'■ carry ". Photo by J. G. Needham 



PLATE 8 



Shore of Little Bog pond. Photo by C. Betten ^ 



PLATE 9 

 Bur reed (Sparganium) with long-horned leaf beetles (Donacia 

 emarginata Kirbyj. a summit of the plant, with beetle on the leaf 

 (greatly reduced); & roots as withdrawn from the water, with larval and pupal 

 cases of the beetle attached (slightly reduced). Photos by J. G. Needham 



PLATE 10 



Fig. Leucorhinia glacialis Hagen 



1 Two nymphs on the bottom of the pond 



2 The empty nymph skin, left clinging to a branch after transformation 



3 The female imago 



4, 5 Dorsal and lateral views of the male imago 



