BULLETIN OF THE UNITED STATES FISH COMMISSION. 
42 G 
AQUATIC INVERTEBRATE FAUNA OF THE YELLOWSTONE NATIONAL PARK, WYOMING, 
AND THE FLATHEAD REGION OF MONTANA. 
Page. 
Aerial sound, note on 215 
Bridge Creek 227 
Bridge Bay 228 
Discussion of the collections 213-214 
Descriptions of species and varieties 240-256 
Duck Lake 230 
Explanation of plates 258 
Flathead Lake 236-238 
Flathead River system 236-239 
Genera and species referred to : 
Acroperus leucoceplialus 222, 230, 232 
Agabus 233, 234 
Agrion 218, 220, 232, 233, 239 
Agrioninax 219, 230 
Alona 225, 230, 232, 239 
Allorchestes 216, 219, 221, 227, 235 
dentata 214, 218, 219, 220, 225, 230, 232, 233, 
238, 239 
inermis 225, 227, 228, 229 
Amnieola 220, 229 
Amphipoda 218 
Annelida 233 
Aulostoma lacustris ’ 2i8 
Bosmina 216, 227, 238 
longirostris 222 
Cfenis 222 
Candona 230 
Ceriodaphnia 214, 227, 232, 233 
reticulata 232. 233 
Chietogaster 233 
Chara 226,231 
Chironomus 214, 217, 218, 219, 220, 222, 225, 226, 227, 228, 
■ 231, 232, 233, 234, 235, 238, 239 
Chydorus 216,218,231,232 
sphaericus 225, 227, 229, 232, 233 
Cladocera 225, 233, 240, 244 
Cladophora 215, 222 
Clepsine 220, 225, 226, 227, 231, 234, 235, 239 
elegans 220 
ornata 232 
Crelambus 219 
Coleoptera 227, 239 
Colymhetes 233 
Conochilus 219, 220, 225, 227 
leptopus 225,229,256 
volvox 219 
Copepoda 233,247,255 
Corethra 214, 220, 228, 230, 233, 234 
Corisa . . .214, 217, 218, 219, 220, 226, 227, 228, 232, 233, 235, 239 
Crustacea 238 
Culex 218 
Culicidse 227 
Cyclops 214, 216, 220. 225, 227, 231. 232, 233, 235, 238 
capilliferus 248-249 
gyrinus 216, 218, 222, 225, 230, 238, 239 
minnilus 216. 225, 230, 247 
serratus - 247, 248 
serrulatus 216,218,225,229 
tbomasi 238, 249-259 
Cypris 
barbatus 
grandis 
Daphuella 
bracliyura 
216, 218, 225, 226, 227, 228, 232, 239 
227, 228, 244-246 
246 
220. 227 
221,222 
Page. 
Genera and species referred to— Continued. 
Daplmia 214,218,227,231 
angulifera 218, 220 
arcuata 222 
clathrata 235, 240-241 
dentata 244 
dentifera 240, 243-244 
pulex . . . 214, 216, 218, 225, 226, 227, 228, 230, 232, 233, 
237, 238, 242, 243 
pulex var. pulicaria 242-243 
schoedleri 231, 232, 233, 234 
thorata 237, 238, 239, 241, 242 
Daphniidse 235 
Deronectes 226, 228, 233 
griseostriatus 234 
Diptexa 218 
Diaptomus. - .216, 217, 218, 219, 220, 221, 222, 225, 227, 228, 229 
233, 235, 238 
leptopus 253 
lintoni 216. 225, 230, 231, 232, 233, 234, 235, 
252, 253 
piscinae 232, 253, 254 
Shoshone .214, 216, 219, 221, 225, 229, 232, 233, 235, 
251-252 
sicilis 216, 219, 222, 225, 226, 229, 232 
stagnalis 251, 253 
Difflugia 222 
globulosa 230 
Dytiscidae 218, 232, 233, 238, 239 
Echinopyxis 222 
Ephemera 2-20 
Ephemeral* 227, 239 
Episclnxra 220 
tluviatilis 254 
lacustris 254,255 
nevadensis Columbia 1 . 238, 239, 254-255 
nordenskicehlii 254 
Eurycercus 232,238 
lamellatus 218, 222, 227, 239 
Gammarus 216. 217, 219, 221, 225, 226, 227, 230, 232, 233, 
235, 238 
robust, us 216, 218, 219, 228, 229, 239 
Graphoderes fasc.iaticollis 230 
Gregarinae 216 
Haliplus 228,230,235 
Holopedium gibberum 219, 222, 234 
Hydaticus 232 
Hydrachnidax 218, 220, 228, 239 
Hydra fusca - 220,222 
Hydropbilidae 238, 239 
Hydx-ophilus 217, 220 
Hydroporus 232, 233 
Hygrotrechus 228, 231 
Lacinularia socialis 214 
Leptodora 
hyalina . 
Libellula 
Libellxxlida 
Libellulinae 
Limnaxa 
Macrothrix 
Melaniidae 
Monostyla 
cornuta 
238 
222, 239 
232 
217 
230 
227, 228, 229, 232, 233, 238, 239 
227, 232 
220 
228 
229 
