450 



Odonata. Libellulidae : Macromia sp., possibly illinoiensis 



Walsh, numerous small naiades. 

 Coenagrionidae : Enallagma antcnnatnin (Say), 

 small naiades. 

 Enallagma sp., naiades abundant. 

 Agrionidae: Hetaerina amcricana (Fabr.), adults 

 common, ovipositing in the stream. 

 Hemiptera. Nepidae: Rauatra amcricana ( Mont.), adults. 



Hydrometridae : Hydronictra ;;jar/;;;t Kirk., adults 



abundant. 

 Mesoveliidae : Mesovelia iniilsaiiti White, adults 



abundant. 

 Gerridae : Trcpobalcs pictiis (H. S.), few nymphs 

 and adults. 

 Neuroptera. Sialidae : Sialis iufvmata Newm., fully grown lar- 



vae. 

 Coleoptera. Gyrinidae : Gyrinits acncolus Lee, adults. 



Helmidae : Hclinis vittata Melsh., adults. 

 Stcnehnis sp., adults and larvae. 

 Diptera. Culicidae : Anopheles punclipcnms Say, larvae. 



Station 21. — Salt Fork, one-fourth mile below its union with Stony 

 Creek, August 25. The bottom is covered with coarse rubble, forming 

 riffles. The banks and margins of the stream are dense with Dianthcra 

 which in places quite chokes the stream. 



Plecoptera. 

 Ephemerida. 



Odonata. 



Hemiptera. 



Neuroptera. 



Trichoptera. 



Perlidae : Pcrla sp., naiades. 



Ephemeridae: Hcxagcnia bilineata Say, naiades. 

 Ephemera sp., naiades. 

 Bactis sp., naiades abundant. 

 Heptageiiia sp., several species, naiades. 

 Chirotcnctcs albomanicatus Ndm.. naiades. 

 Agrionidae: Hcfacriiia aiiicricaini (Fabr.), adults 



common, ovipositing in the stream. 

 Coenagrionidae : Argia niocsta piitrida Hag. and 

 Ischnura vcrticalis (Say), adults common, ovi- 

 positing in the stream. 

 Gerridae: Mctrobatcs hcspcritis Uhl., adults abun- 

 dant. 

 Veliidae: Rliagovella obcsa Uhl., adults abundant. 

 Mesoveliidae: Alesovelia iiiiilsaitti White, adults 



abundant. 

 Sialidae: Corydalis coniuta (Linn.) larvae very 

 abundant, all sizes from newly emerged to almost 

 fully grown. 

 Hydropsychidae : Hydropsyclie sp., larvae and 

 their nets. 



