mosquito hawk

from The Century Dictionary.

• noun A dragon-fly.
• noun The night-hawk, a caprimulgine bird, Chordeiles popetue, or some other species of the same genus.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun US, regional A dragonfly.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun mainly nocturnal North American goatsucker
• noun slender-bodied non-stinging insect having iridescent wings that are outspread at rest; adults and nymphs feed on mosquitoes etc.