H4 



ANIMAL COMMUNITIES OF STREAMS 



TABLE XVII 



Distribution of Invertebrates in North Shore Streams 

 The meaning of the numbers is shown in Figs. 67 and 69. a = Temporary pool 

 {consocies); & = Very young stream and intermittent riffles (ephemeral consocies). 



Common Name 



Caddis- worm 



Mosquito larva 



Amphipod 



Isopod 



Snail 



Crayfish 



Black-fly larva 



May-fly nymph 



Crayfish 



Burrowing dragon-fly 



Dragon-fly nymph. . . 



Amphipod 



Snail 



Crayfish 



Crayfish 



Crane-fly larva 



Amphipod 



Snail 



Dragon-fly nymph. . . 



Scientific Name 



Phryganeidae 



Anopheles 



Eucrangonyx gracilis 



Smith 



Asellus communis Say.. . 

 Lymnaea modicella Say. . 

 Cambarus dio genes Gir . . 



Simulium sp 



Heptageninae 



Cambarus blandingi 



acutus Girard 



Cordulegaster obliquus 



Say 



Aeschna constricta Say.. . 

 Gammarus fasciatus Say . 



Physa gyrina Say 



Cambarus virilis Hag . . . 

 Cambarus propinquus Gir 

 Pedicia albivitta Walk 



(rarely) 



Hyalella knickerbockeri 



Bate 



Planorbis campanulatus 



Say 



Tetragoneuria cynosura 



Say 



