AQUATIC INSECTS IN NEW YORK STATE 221 
CaLOPTERYX 
This strongly marked genus is abundantly represented about 
the borders of creeks and small rivers throughout the State, 
specially where such streams traverse rocky woods. The showy 
imagos, with their black or smoky wings, and bodies of brilliant 
metallic green, are very conspicuous, and well known insects. 
They usually remain in proximity to their native streams, but 
sometimes follow paths for a considerable distance through 
: adjacent woods. Their fiight is poor and fluttering, and on 
windy or cloudy days they keep rather closely to shelter. The 
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Fig. 3 Nymph of Calopteryx maculata 
nymphs rest on silt-covered vegetation or on roots swaying in 
the current, and are rather inactive, moving but little from 
place to place. 
The known nymphs agree in the possession of long cylindric 
‘bodies, heads dorsally depressed, antennae with unusually de- 
veloped basal segment, exceeding in length all the other seg- 
‘ments put together, labium with a median cleft which divides 
the median lobe far below the level of the bases of the lateral 
lobes, a pair of spinules beside the cleft within, and three others 
‘at the base of each lateral lobe, legs long and thin, radiately 
(arranged, gills three, variable in proportions, but always stout, 
|\the lateral pair with external carina, the middle one two-edged, 
|\all easily broken off, and generally wanting from specimens 
\|that have received too rough treatment. 
