328 NATURAL HISTORY CALENDAR. 
amp, wet, Swampy places. A very abundant species on grass pro- 
be what is called ‘‘frog’s spittle.” It can easily be traced through 
l its changes by frequently examining the mass of froth 
which surrounds it. Tettigonia vitis blights the leaf of the 
grape-vine. It isa tenth of an inch long, and is straw-yellow, 
striped with red. Tettigonia rose, a still ae species, in- 
fests the rose, often to an a arming exten 
he Notonecta, or water boatman, is nine like a Tettigonia, 
but its wings are transparent on the outer half, and its legs 
are fringed with long hairs, being formed for swimming. 
They row over the surface in pursuit of insects. Notonecta 
undulata of Say (Fig. 1, from Sanborn) is a common form in New 
ngland. 
an 
Another gorg is the singular Ranatra fusca (Fig. 2, from 
anb 
surface of the water when it 
wishes to breathe. wa species 
connects the Water - boatman 
withthe Water-skaters Fig. 4. 
or Gerris, a fami 
sect, of which patio’ 
paludum (Fig. 3) is 
ommon 
monly seen run- 
nin er the surface 
of streams and pools. 
ius and its al- 
lies belong to a large family of very useful insects, as they prey 
largely on caterpillars and noxious insects. Such is dioheaygee 
(Fig. 4), a common species. It is an ally of Reduvius personatus, 
é 
