COSTAL • FREE-TRANSLATOR.COM • Definition of Costal

... with hairs, the wings are horizontal, of an obovate oblong shape, membranous, and extending a little farther than the bristles of the tail. They have only two nerves, neither of which reaches so far as the tips; one of them runs close to the costal margin, and is much thicker than the other, which branches off from its base and skirts along the inner margin; behind the wings is attached a pair of minute halteres of peculiar form. The possession of wings would appear to be the cause ...

— Sketches of the Natural History of Ceylon • J. Emerson Tennent