MARINE INSECTS. 961 
bug, makes the salt water its home; the Halobates, another 
hemipterous insect, faces the tranquil mirror of the tropical 
seas as leisurely as our water-bugs sport on the glassy surface 
of our ponds, and the Gyrinus marinus, a beetle belonging 
to the family of the whirligigs, ambitiously seeks a wide 
expanse, and may be seen curvetting about on the surface 
of the sea, and darting down every now and then to seize its 
plev. 
Stenopus hispidus 
