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 numbers 
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. 
Tropisternus nuxtus 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 Gyrinide are 
confined to the surface, the Haliplidze occur at the bottom “crawling” over 
the plant stems and sticks, while the Dytiscidze and Hydrophylidz occupy 
the intervening space as well as surface and bottom. The surface supports 
one species, the bottom two, while eight species are more generally dis- 
tributed. ‘ihe Dytiscidz are represented by six species, the Hydrophilid:e 
by two. ‘The Dytiscidre are much stronger swimmers and more voracious 
feeders than the Hydrophilide, which facts may account for their more 
successful occupancy of the pond. 
Heterina 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. 
