Wing-polymorphy
Guides
Stilpon
Stilpon is a genus of small predatory flies in the family Hybotidae, subfamily Tachydromiinae. The Nearctic fauna comprises 13 recognized species, including nine described by Cumming (1992), classified into three informal species groups: S. divergens, S. graminum, and S. varipes. The genus exhibits wing polymorphy in some species, with both macropterous and micropterous forms documented in S. graminum, S. nubilus, and S. subnubilus.