(Fig. 3 A–C)
Material examined. CANADA: Manitoba, Lake Winnipeg,Victoria Beach, 24 males, 9.vii. 1969; 0.5 km off George Island, 9 males, 11. & 12.vii. 1969; 10 km off (Sturgeonskin Point) Long Point, 15 males, 14.vi. 1969; 3 km off McCreary Island, 14 males, 13.vii. 1969; Gull Harbour, 1 male, 9 females, 16.vii. 1969; Matheson Island Government Wharf, 8 males, 26.vii. 1969; 3 km off George Island, 2 males, 27.vii. 1969; Grand Rapids Government Wharf, 17 males, 28.vii. 1969; Pine Dock, 7 males, 31.vii. & 2.ix. 1969; Beaver Point, 12 males, 7. – 27.vii. 1971; 20 Mile Creek, 4 males, 26.viii. – 1.ix. 1971; Old Fishing Dock, 4 males, 29.vi. 1971; Calder's Dock, 135 males, 10.vi. – 26.viii. 1971; Hecla Island, 2 males, 27.vii. & 11.viii. 1971.
Normal male imagines from Lake Winnipeg have an AR of 3.80–4.32, 3.99 (10); 17 –33, 24 (15) sensilla chaetica on ta 1 of p 2, no sensilla chaetica on p 3; a BR, of 6.6–9.1, 7.7 (10), and 10 –20, 14 (10) setae oromedian on T IX (Saether & Galloway 1977, table 1). Hypopygium as in Fig. 3 A. The genitalia of a normal male and a female, a male intersex and several possible gynandromorphs are illustrated by Saether & Galloway (1980 figs. 3, 4). The females have 83 –105, 92(8) sensilla chaetica on ta 1 of p 2, none on p 3, and a BR 1 of 2.0– 2.6, 2.3 (6). The female genitalia are illustrated in Fig. 3 B, C (from Saether 1977 fig. 80 A–B) and described by Contreras-Lichtenberg (1996: 20).
Distribution and ecology. The species was previously known from the Palaearctic Region excluding North Africa, from the Near East, and from Alberta and Oregon to Newfoundland, and south to Oklahoma, Louisiana, Mississippi and Florida (Townes 1945: 142, Oliver et al. 1990: 47, Fittkau & Reiss 1978: 432, Saether & Spies 2004).The species is primarily free-living in the littoral sediments of ponds and lakes with a few individuals found mining in roots and stems of water plants (Wundsch 1943). In strongly eutrophic, shallow pondlike lakes with welldeveloped and luxuriant higher vegetation, G. p a r i p e s and/or G. p a l l e n s (Meigen) may completely dominate the chironomid fauna (" Glyptotendipes -lakes") (Wundsch 1943, Nielsen 1962).