AQUATIC INVERTEBRATE FAUNA OF WYOMING AND MONTANA. 
233 
Weedy beaver pool near Soda Bntte Creek, September 1, 1891: 
Agabus sp. (two). 
Hydroporus sp. (several). 
Colymbetes sp. (one). 
Dytiscidae (larvae). 
Corisa sp. (several). 
Ephemerid larvae (a few). 
Chironomus larvae (many). 
Pbryganeid* (many, with cylindrical tubes made 
of cylindrical pieces of vegetation). 
Turbellaria (brown cylindrical species. See page 
229). 
Weedy pond near Soda Butte Creek, September 
Chironomus larvae (a few). 
Corethra larva (one). 
Ephemerid larva: (several). 
Cyclops sp. (one). 
Standing pools left by Soda Butte Creek ; 
Hydroporus sp. (one). 
Chironomus larvae (a few). 
Ephemerid larvas (many). 
Phryganeidae (small, one). 
Podurid (great quantity on algae). 
Gammarus (one). 
1, 1891: 
Simocephalus vetulus (very many). 
Ceriodaphnia sp. (very many). 
Daphnia pulex (many). 
Annelida (one, fragment). 
covered with algae ; muddy bottom ; Sept. 1, 1891 : 
Cyclops sp. (one). 
Daphnia schcedleri (many). 
Simocephalus vetulus (very abundant). 
Ceriodaphnia reticulata (many). 
Physa sp. (large, two). 
Cliaetogaster sp. (one). 
Two circular ponds, each approximately 500 feet across, situated about a mile 
from Baronette’s Bridge and beside Lamar River, were examined in passing, so far as 
could be done by alongshore work and by wading out with a surface net. In one 
there was an abundance of vegetation — rushes and a variety of other water weeds — 
and no appearance of alkaline deposit, the bottom being a film of mud on gravel. In 
the other there were no rushes, but the water was sufficiently alkaline to have a smooth 
feeling, and the dead water weeds were whitened as they lay upon the bank. 
In the first pond, there was a great quantity of dead shells of a large Planorbis , 
and fewer of a large Limncea around the margin. Vast numbers of Allorchestes dentata 
occurred on the vegetation, and especially in the soft mud of this pond. The ento- 
mostraca were nearly all Copepoda , of the genus Diaptomus , most of them D. lintoni. 
Hot a single Cyclops was noticed, nor a single Daphnia. A few Ceriodaphnia} occurred, 
several specimens of Simocephalus vetulus, a very few of Cliydorus sphccricus , and, for 
the rest, a considerable number of hydrachuids, a few Chironomus larvae, and several 
larvae of dragon-flies ( Agrion ). With the foregoing were the common large Corisa 
of this region, Notonecta* Physa, Deronectes , and a small hydrophylid larva. 
In the alkaline pond near by were a very few mollusks and a moderate number of 
insects, the latter consisting chiefly of agrionine larvae and small larvae of Chironomus. 
The entomost.raca were much as before, except that Diaptomus shoshone in small 
numbers mingled with D. lintoni. 
