Sphex\, n.[NL., fr. Gr. ???, ???, a wasp.] (Zo["o]l.) Any one of numerous species of sand wasps of the genus Sphex and allied genera. These wasps have the abdomen attached to the thorax by a slender pedicel. See Illust. of Sand wasp, under Sand.

Sphex fly (Zo["o]l.), any one of numerous species of small dipterous flies of the genus Conops and allied genera. The form of the body is similar to that of a sphex.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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