399 



SPAWNING DATES, HAVANA AND VICINITY, I9IO AND I9II 



I9IO 



April 8-30. Vicinity of Havana (reported by fishermen; locali- 

 ties various). 



May I- 10. Danhole's field. Large numbers spawned between 

 these dates. Eggs found. 



May 10. Schulte's field. Eggs found. 



May lo-ii. Beck's Swale and ponds. Eggs found. 



1911 



April 2^ Head of Flag Lake. Breeding males and females on 

 spawning grounds. Giggers at work. No eggs could be found. 



May 2-^. Danhole's field. Fresh eggs found. 



May 2-^. Head of Flag Lake. A few dozen observed spawning. 

 Eggs found. 



May 6. More than looo seen spawning in Sangamon Bay. Many 

 fresh eggs taken. Spawning females taken with dip-net. 



May 8. About a hundred seen spawning on the west side of 

 Thompson's Lake ; a few at head of Flag Lake ; and a hundred in 

 Danhole's field. 



May 2^. Dierker Lake. A few dozen seen spawning. 



June 2. Flag Lake Swale. About a dozen spawned. Eggs taken 

 and hatched. 



June 5-5*. "Middle Ground", Clear Lake. Fishermen report con- 

 siderable numbers spawning. 



SITUATIONS SELECTED EOR SPAWNING 



1. Overflowed fields and marshes (cultivated previous to opening 

 of the Drainage Canal in I9(X)) grown up with bog rush, smartweed, 

 cut-grass, and "flag" (Scirpus) ; depth of water (April and May, 

 1910 and 191 1 ) I to 2 feet. Danhole's and Schulte's fields. 



2. Shallow ditches and ponds, mud bottom and smartweed ; water 

 I to 2 feet deep, 1910. Beck's ponds. 



3. Shores of open lakes, in vegetation zone ; flag, smartweed, 

 Potamogcton, and Ceratophylluni; water i to 2 feet deep, 191 1. 

 Northwest shore of Flag Lake ; west shore of Thompson's Lake ; 

 head of Dierker Lake. 



4. Overflowed mud flats, grown over with willows, grass, and 

 Ceratophylluni; water i to 3 feet deep, 191 1. Flats at south end of 

 Sangamon Bay and head of Pluckimen's Slough. 



