234 DRY AND MESOPHYTIC FOREST COMMUNITIES 
forest temporary ponds. Beneath the leaves and wood are snails 
(Zonitoides arboreus), millipedes (Polydesmus sp.), and centipedes (Litho- 
bius sp.), and in dry weather Polygyra thyroides and multilineata. 
Ground beetles and rove-bzetles are common. One finds Cicindela 
Fic. 212.—The oak tree-hopper (Telamona querci) (after Lugger). 
sexgultata, the green tiger-beetle, here rarely; it is much commoner in 
later stages, however. 
In the decaying logs and stumps are darkling beetles (156), numerous 
wireworms (Elateridae), and myriopods. Sometimes fungus-feeding 
beetles (Diaperis hydni and Eustrophus tormentosus) are present in 
numbers. Ants are also often 
abundant. Carpenter ants are 
common. The aphid housing 
ant (Lasius umbratus subsp. 
mixtus var. aphidicola) is some- 
times abundant. In autumn 
certain galleries in the wood 
are crowded with woolly aphids 
which are the so-called “cows” 
which the ants house for the 
winter. 
b) Field and shrub strata.— 
In moist weather the snails (Polygyra) mentioned above are common 
on the herbaceous vegetation, while the tree-frogs (Hyla versicolor and 
pickeringit) (139) are common, and spiders are numerous. 
c) Tree stratum.—The oaks (137) are affected by many of the same 
species as in the earlier stages. The tree-frog is sometimes found in the 
a 
Fic. 213.—The oak plant-bug (Hyaliodes 
vitripennis) (from Washburn after Riley): 
a, young; 0, adult. 
