FAUNA OF A SMALL BROOK 
37'3 
TABLE OF FORMS TAKEN FROM THE WATER AND FROM THE TRANSITION 
ZONE OF THE BROOK, WITH INFORMATION AS TO THE PAR- 
TICULAR ASSOCIATION OF WHICH THEY 
FORM A PART, THEIR POOD 
AND NUMBERS. 
Animal 
Association 
Food 
Numbers 
Surface film 
Bottom 
Free swimming 
Transition zone | 
Herbiverous 
Predaceous 
Scavenger 
Microscopic 
organisms | 
Numerous j 
1 
Platworms, Planaria sp? * 
+ 
+ 
4 
4 
Ostracoda 
+ 
+ 
4 
4 
Copepoda, Cyclops sp? 
rf 
4 
Mollusca, snails, 
Physa gyrina Say 
+ 
+ 
4 
Limnaea sp? 
+ 
4 
Spiders, Drassidae 
+ 
+ 
4 
May flies, Blasturus sp? nymph 
+ 
+ 
4 
CalUhaetis sp? nymph 
+ 
+ 
4 
Dragon fly, Gomphrus sp? nymph 
+ 
+ 
-U 
Water strider, Gerris marginatus Say? 
+ 
+ 
4 
Gerris remegis? 
+ 
+ 
4 
Water boatman, Corisa sp? 
+ 
+ 
4 
Dytiscid beetles. 
Acilius mediatus Say 
+ 
+ 
4 
LaccopMlus fasciatus Aube . . . 
+ 
+ 
4 
Hydrophilid beetles. 
HydroMus fuscipes L 
+ 
+ 
4 
Helophorus lineatus Say 
+ 
4- 
4 
PMlydrus cinctus Say 
+ 
+ 
4 
Cymhiodyta fimhriata Say. . . 
+ 
+ 
4 
Staphylinid Beetles, 
Tachyporus jocosus Say. . . . . . 
+ 
4- 
4 
8tenus 
4- 
4 
4 
Heterocerid Beetle. 
-f 
4 
Mosquitoes, gnats. 
Culex sp? larvae 
+ 
4 
44 
Corethra sp? larvae 
+ 
4- 
4 
Gorethrella sp? larvae 
+ 
4 
4 
Midges, GMronomous sp? larvae 
+ 
4 
4 
Ceratopogon sp? larvae 
+ 
T" 
Crane-flies, 
TipuUdae, larvae 
+ 
4 
4 
4 
Soldier-flies 
Stratiomyiidae, larvae 
+ 
4 
4 
Frogs, Bana pipiens Sch. adult 
+ 
-f 
-f 
Hyla versicolor le Conte, larvae 
+ 
+ 
4 
