512 
III. Weed Fauna, 1- to 4-Foot Zone, Lakes and Backwaters 
in Vicinity of Havana, 1914 
DeaD TIMBER RIDGE BETWEEN FLAG AND THOMPSON LAKEs, Oct. 6, 1914, 
Opposite ‘““WARNER’S CUT,” IN CERATOPHYLLUM AND ALGAE 
Weep Fauna, Uprer 9 INCHES (DEPTH, 2 FT.) 
No. per sq. yard 
Pounds per acre 
Valvata spp. 22,500 1,347.5 
Amnicola limosa 4,500 209.0 ° 
2,164.0 
Physa (small spp.) 1,500 82.5 
Planorbis trivolvis 750 525.0 
Chironomid larvae (small spp.) 750 52.5 
Pelocoris 270 256.5 429.0 
Hyalella knickerbockeri 3,000 120.0 
Total 33,270 2,593.0 
Heap oF FLAG LAKE, Oct. 7, 1914, 1n SMARTWEED AND SCIRPUS 
WEED FAUNA, Urbrr 9 INCHES (DerTH, 1.5 FT.) 
No. per sq. yard 
Pounds per acre 
206.2 
Physa (small spp.) 3,750 ' 
Amnicola limosa 1,500 57.0 ' 
481.4 
Valvata spp. 150 8.2 
Planorbis trivolvis 300 210.0 
Chironomid larvae (small spp.) 4,500 315.0 
Agrionid nymphs 1,500 750.0 
Small libellulid nymphs 750 375.0 ’ 2,036.2 
Pelocoris femoratus 375 356.2 
Hyalella knickerbockeri 6,000 240.0 
Total 18,825 2,517.6 
