452 



Corixidae : adults. 



Gelastocoridae : Gclastocoris oculatus (Fabr ) 

 adults and nymphs along wet margins of stream 

 Neuroptera. Sialidae : Sialis iiifiiiitala Xewm., lan'ae. 



Corydalis cornnta (Linn.), larvae. 

 Trichoptera. Hydropsychidae : Hydropsyclic sp., larvae an<l 



nets. 

 Coleoptera. Gyrinidae : Dincutcs aincricanus Say. adults. 



Haliplidae: Peltodytcs 12-punctatus (Say), adults. 

 Hydrophilidae : Tropistcrmis glabcr (Hbst.), 



adults. 

 Dryopidae: Helichus Uthophilus (Germ.), adults. 

 Diptera. Tipulidae : Erioccra sp., possibly i/ibbosa Doane, 



larvae beneath stones in rapid water. 

 Chironomidae : Chironomus sp., larvae abundant. 

 Tabanidae: Tahamis sp., larva. 



Station 24. — Collections made beyond the mouth of the ^liddle 

 Fork, one and one-half miles south of Hillery. The conditions here were 

 very much as in the Salt Fork farther west. Most collections were 

 made in the rapids and among the roots of the Dianthcra beds. The 

 water at this date (August 31) was very low and had a strong odor 

 like that of decaying fish. 



Plecoptera. Perlidae : Ptcrouarcys dorsata Say, naiades. 



Perla sp., naiades of various sizes. 

 Ephemerida. Ephemeridae : Cacnis sp., possibly dintiiiuta \Y\<., 

 naiades. 

 Hcptagcnia sp., naiades. 

 Chirofcnctcs alboinaiiicatus Ndm., naiades. 

 Callibaetis sp., possibly fcrruginca Wk., na- 

 iades. 

 Odonata. . .Aeschnidae : Gomphus sp., naiades. 



Libellulidae : Macrom'ia sp., possibly illiiioicnsis 



Walsh, naiades common. 

 Agrionidae : Hctacriiia anicricaiia (Fabr.), na- 

 iades abundant. 

 Coenagrionidae : Argia iiiocsta piitrida Hag., na- 

 iades abundant. 

 Hemiptera. Corixidae : adults and nymphs. 



Gerridae : Mctrobatcs Iicspcrlus Uhl., adults. 

 Mesoveliidae : Mcsoi'clia )in<Isaiiti \\'hite, adults. 

 Veliidae : Rhagovclia obcsa Uhl., adults and 

 nymphs abundant. 

 Neuroptera. Sialidae: Corydalis cornnta (Linn.), larvae, all 



sizes, extremely abundant. 

 Trichoptera. Hydropsychidae. Hydropsyclic sp., larvae abun- 

 dant. 



