Numbers
11 species in 6 genera in North America (
nearctica.com)
about 130 species worldwide (Wikipedia and Encyclopedia Britannica online)
Arnett lists ten species in five genera
(1).
Identification
slender body with unusual elongated head constricted behind eyes and at base; ocelli present; antennae and beak 4-segmented; forewings entirely membranous; front femora and tarsi thickened; middle and hind tarsi 2-segmented
Range
New England to Florida, west to Utah and Arizona (Eric Eaton)
represented throughout the world
Habitat
under leaf litter, rocks, bark
Life Cycle
Some species form swarms in sunny patches in woodland, resembling the behavior of midges
(2).
Remarks
uncommon insects, rarely encountered and easily overlooked
Print References
Slater, pp. 117-118, figs. 210-212
(2)Internet References
live adult image and literature references (David Maddison, Arizona, Tree of Life)
live adult image and info on family (Museums of Cape Town, South Africa)
pinned adult images of 3 species (Landcare Research, New Zealand)
information article (Encyclopedia Britannica online)
occurrence in Wisconsin 1 species:
Systelloderes biceps (U. of Wisconsin)
drawing of adult and other info (Cornell College, Iowa)
Contributed by
Robin McLeod on 30 July, 2005 - 11:21pm
Additional contributions by
cotinisLast updated 26 August, 2006 - 9:07am