12 Lake Maxinkuckee, Physical and Biological Survey 



swallowed by a fish before it could be picked up ; the inference, 

 of course, is that the others were similarly disposed of. 



5. Dragon-fly nymphs in all probability prey on leeches 

 amongst their other food, and leeches are the most fatal parasites 

 that infest the lake, killing numbers of fish annually. Anything 

 that tends to reduce the number of leeches, therefore, will have 

 great economic value because they have very few enemies so far 

 as known. 



This relation between dragon-fly nymphs and leeches is worthy 

 of careful study in the future. The author greatly regrets that the 

 lateness of the season prevented the acquiring of any positive data 

 on this point. 



Specimens of every dragon-fly mentioned in the following list 

 were collected and personally identified by the author. . The species 

 are arranged according to the admirable list of "The Dragon-flies 

 of Indiana" by E. B. Williamson, as published in the Report of the 

 State Geologist of Indiana for 1900. 



Many additional facts have been taken from this list and the 

 author also wishes to acknowledge his indebtedness to Mr. William- 

 son for valuable criticism and advice given in private correspond- 

 ence, and for the last four species here reported, which were col- 

 lected by Mr. Williamson at Lake Maxinkuckee in May, 1900. The 

 author could not begin his collecting until the middle of July, and 

 it is practically certain that the months of May and June would 

 add ten or a dozen more species to the list. 



LIST OF SPECIES 



1. BOYERIA VINOSA (Say) 



A rare species, shy and wary, and a strong flier. It was not 

 positively identified around any of the lakes visited, but was 

 thought to have been seen flying over Lost Lake on several occa- 

 sions. Three pairs were seen along the Tippecanoe River on Sep- 

 tember 4, the females depositing their eggs in the edge of the weeds 

 along the banks. One of these pairs was captured. 



2. AESCHNA CONSTRICTA Say 



A species seen only occasionally during the summer, but becom- 

 ing more common during the autumn, and finally in the middle of 

 September congregating in considerable numbers around Hawk's 

 marsh, which is situated about a quarter of a mile inland from the 

 west shore of the lake. This species, as noted by Williamson, pre- 

 fers the shelter of the bushes and rushes, and returns constantly 



