The Notonectidae breathe mostly through the thoracic spiracles; the air is conveyed to these from the tail-end, which is brought to the surface, along a kind of tunnel formed by overlapping hairs.
The Notonectidae, or " water-boatmen " (q.v.) have convex ovoid bodies admirably adapted for aquatic life.
WATER-BOATMAN, an aquatic hemipterous insect of the family Notonectidae, of which the best known species (Notonecta glauca) is a prominent feature in the pond-life of Great Britain.
Other families of Hemiptera - such as the " Boatmen " (Notonectidae) and the " Water-scorpions " (fig.
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