crane fly

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of numerous long-legged, slender-bodied flies of the family Tipulidae and several other families of the suborder Nematocera that have the general appearance of a large mosquito but do not bite.

from The Century Dictionary.

• noun A common name of the dipterous insects of the family Tipulidæ (which see).

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

• noun long-legged slender flies that resemble large mosquitoes but do not bite