Solitary Wasp Meaning

(dated) An informal taxonomic grouping of of genera of wasps that included most of those with solitary habits.

Example: Used other than as an idiom: see solitary,‎ wasp.
1824, Oliver Goldsmith, A history of the earth, and animated nature, Volume 5, pages 156-7
  In the principal species of the Solitary Wasps, the insect is smaller than the working wasp of the social kind.
1860, William Somerville Orr, ‎Richard Owen, ‎Robert Gordon Latham, Organic Nature: Botany, structural and systematic, page 395
  The Solitary Wasps usually make their nests of clay or agglutinated sand, generally attaching them to walls and palings; a few also burrow in sandy ground.
1875, British Bee Journal, volume 3, page 78
  The true wasps (Diploptera) are divided into two families, Eumenides and Vespides. The fore-wings are folded longitudinally in repose. The solitary wasps much resemble the Fossores in their habits ; and differ from the social wasps in having bifid claws.