536 



the most abundant, among algae near the shores ; Asellus was also 

 common at the margin ; and the river shrimp (Palcemonetes) and 

 crawfishes were frequently taken. The aquatic insects occurring 

 here were as follows : 



Adults: Gyriiins analis^ Tropistcniiis dor sails, T. glaher, Pelto- 

 dytes edentidus, P. pednnculatus, Coptotomits interrogatus, Dryops 

 lithophihis, Philhydriis nebulosus, Colynibetes scidptilis, Notonecta 

 variabilis, Corixa erichsoni, C. hurmcisteri; C. alternata, C. har- 

 risii, MesoTclia viulsanti, Zaitha Huminca, Pelocoris poeyi, Ranatra 

 fusca. Larvae: agrionid nymphs, Mcsotheniis simplicicollis, Anax 

 Junius (nymph), Celithemis nymphs, Odontomyia, Chironomidcc, 

 caddis larvae, Chauliodcs. 



Our mussel collections, representing twenty-two species, were very 

 like those at Hennepin, differing in the addition to the Hennepin 

 list of Lanvpsilis aiwdontoides, Obliquaria reHexa, Plagiola elcgans, 

 P. sccuris, Quadrula cbcna, Tritogonia tuberculata, and Unio gibbosus. 

 Among the most abundant species were Anodonta imbecillis, Lamp- 

 silis fallaciosa, Quadrula heros, and Q. plicata. Sphccriuni transver- 

 sum was also common here, with occasional specimens of S. stri- 

 atinuDi and S. jayamim. Pisidiuni was taken in four collections with 

 the Ekmann dredge, in water six to eight feet deep. 



The commonest snails were Cainpcloma and Vivipara contcctoides, 

 both very abundant in various situations, and Pleurocera, obtained 

 mainly by the Ekmann dredge at depths varying from six to thirty 

 feet. Additional species are Physa gyrino, Planorbis trivolvis, P. 

 parvus, Valvata bicarinata, Lioplax, Goniobasis, and Amnicola. 



Commercial fishing is carried on in the Henry-Chillicothe sec- 

 tion on a large scale in good seasons, but much complaint has lately 

 been made, all along this part of the river, that fishing is not so 

 good as in former years. No systematic work for the collection 

 of fishes was done, and the only specimens taken were caught in 

 small seines used for collecting shore invertebrates, and are as follows : 



Golden shiner, i. Fundulus dispar, 8. 



Spot-tailed minnow, 3. Warmouth sunfish, i. 



Silverfin, i Blue-gill sunfish, 7. 



Shiner, 61 Large-mouth black bass, 2. 



Top-minnows (young), 2. Yellow perch, i. 



This list should be combined with the list for Hennepin to give 

 a fair idea of our collections from this section of the river at this 

 time, those from Hennepin having been made wholly with large 

 seines. 



