Sphex /(?)/

Sphex

n.
  1. 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. (Zool.)

Phrases & Compounds
Sphex fly
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.