65 
Mince Larvar (CHTRONOMIDAE) or Borrom Mups or 
LiverPooL, DocrisH, QuIvER, AND THOMPSON LAKES, 1913—1914 
to 1920—JuLty—Ocroser 
1. Tolerant species or species of doubtful preference that have come in since 
1913—1}. 
Chironomus sp. near decorus Joh., No. 2. Common, 1920, Thompson Lake 
only. 
C. sp. near decorus Joh., No. 1. Common, 1920, Liverpool Lake only. 
2. Formerly common cleaner-water species still surviving in 1920. 
Chironomus ferrugineovittatus Zett. Present, 1920, Quiver Lake only. 
Palpomyia longipennis Lw. Present, 1920, Quiver Lake only. 
3. Cleaner-water species that have dropped out since 1913—1914. 
Tanypus monilis L. Common, all lakes, 1913—1914. 
Procladius concinnus Cog. Common, all lakes, 1913—1914. 
P. sp. near concinnus Coq. Common, most lakes, 1913—1914. 
Chironomus tentans F. Abundant, all lakes, 1913—1914. 
C. modestus Say. Common, all lakes, 1913—1914. 
4. Tolerant species that have dropped out since 1913—191}4. 
Chironomus lobiferus Say. Present, 1913—1914, Thompson Lake only. 
C. decorus Joh. Present, 1913—1914; lake not stated. 
Mince LarvaE (CHIRONOMIDAE) or Borrom Mups, 
LAKES NORTH OF Havana, 1914—15 anp 1920—JuLy—OcrToper 
I. Mud bottom, 2 to 6 feet 
Number per square yard Pounds per acre 
1914—1915 1920 | 1914—1915 1920 
, ; ae d 
Liverpool Lake* 38 14 26 2 
Thompson Lake* 12 24 8 | 4 
Dogfish Lake} : 60 24 30 | 9 
Quiver Lake} 33 54 6 tz 
Ill. River, Liverpool to Ha-|Channel, 0 950 0 164 
vana, 1915, for comparison) 4—7ft., 0 225 0 45 
II. Sandy or sand and mud bottom 
Quiver “channel” * 0 0 0 | 0 
Quiver Lake, sandy shore Not 
east side Not separately counted 6 separately 1 
2 valued | 
* Figures in 1914—15 columns are for year 1915. 
7 Figures in 1914—15 columns are for year 1914 
