413 



Laccophilus fasciatus Aube. 



Both species present in about equal numbers. Hibernate 



Hydrovatus pustulatus Melsh. 



About the southern limit of its range. Present throughout the year 

 but not numerous. 

 Coptotomus interrogatus Fabricius. 



One of the common beetles in the pond. Could be taken in numbera 

 at any season. 

 Graphoderes liberus Say. 



Blatchley notes concerning this beetle : "Putnam and Lawrence coun- 

 ties, frequent in woodland ponds." In this pond I have taken but one 

 specimen and have seen no other. This was taken June 6, 1910. It is 

 quite probable that it had just immigrated. 

 Dineutes assimilis Aube. 



Present from April to October in characteristic groups on the surface 

 of the pond. 

 Tropisteruus ndxtus Leclerc. 



The most common beetle in the pond. Could be seen beneath the ice 

 in winter. 

 Berosus peregrinus Herbst. 



Not common. 



Of the four families of beetles found in this pond, the Gyrinidse are 

 confined to the surface, the Haliplidte occur at the bottom "crawling" over 

 the plant stems and sticks, while the Dytiscidie and Hydrophylidfe occupy 

 the intervening space as well as surface and bottom. The surface supports 

 one species, the bottojn two, while eight species are more generally dis- 

 tributed, 'i he Dytiscidie are represented by six species, the Hydrophilidre 

 by two. The Dytiscid;e are much stronger swimmers and more voracious 

 feeders than the Hydrophilidi"e, which facts may account for their more 

 successful occupancy of the pond. 

 Hetserina americana Fabricius. 



Taken flying over pond Aug. 12, 1910. 

 Lestes congener Hagen. 



Taken Sept. 1, 1910. On that date they were numerous over pond. 

 Ischnura verticalis Say. 



Emerging June 18. 



