II4 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); b=Very young stream and intermittent riffles (ephemeral consocies). 
Common Name Scientific Name CAVA en crane IN ue eae aay lh 7 
Caddis-worm........ Phryganeidae.......-.- = 
Mosquito larva ...... AP OPELCS a, Bae pets 5 iste - 
Amphipod)ssrsrs sete Eucrangonyx gracilis 3 
Smitheyene wesw bs 
Tsopod).t2:3d.qstenerasese Asellus communis Say...| * 
Snails 2128 5 eee Lymnaea modicella Say..| * 
Crayfish oes Cambarus diogenes Gir ..| * 
Black-fly larva....... Simulium sp..........- gil ieee tell Pelle 
May-fly nymph...... Heptageninae.......... ee SAA CEN 
Grayiishter crs cersec Cambarus blandingi 
acutus Girard........ lee 
Burrowing dragon-fly.! Cordulegaster obliquus 
Sayre comes cs oD | te ta ie 
Dragon-fly nymph.. Aeschna constricta Say... oe accel lace 
Ammphipod 5.22.0..." Gammarus fasciatus Say. al oe 
TAM See See esos ea Physa gyrina Say....... hk 
Crayfish etee neice Cambarus virilis Hag .. . EOE Try rae eel 
(Crayiis De yar tss-r ne ete Cambarus propinquus Gir bah Prd 
Crane-fly larva...... Pedicia albivitta Walk 
(rarely)}iiosce tee 
Amphipodienieccs sore Hyalella knickerbockeri 
Baten re wciccs iced 
SNA teste eee Planorbis campanulatus 
Say ete See rere 
Dragon-fly nymph... .| Tetragoneuria cynosura 
Saye, 2 nee eee ns 
