Larva a medium to large plumosus-type; ventral tubules about equal length. Gular region pale or only slightly darkened, frontoclypeus slightly darkened posteriorly. Mentum with relatively pointed teeth; c1 tooth moderately broad with parallel sides, c2 teeth well developed and sharp pointed (type II).
Cytology: 4 pairs of chromosomes with the Camptochironomus arm combination AB, DE, CF, G. Arm G closely paired with three Balbiani rings, 2 close together near one end with a constriction between most distal and the end, and the other towards the other end. Nucleolus in arm B, virtually at centromere, but other smaller ones may be developed distal to this in sequence B2, known only as a heterozygote and apparently confined to males.
pal h'A1: 1ab, 7d-7b, 3i, 2c-1h, 9c-8f, 10-9d, 11-12, 3h-2d, 8e-a, 1c-g, 7a-4, 13-19
pal n'B8:
pal n'B9:
pal h'C2: 1a-e, 15-14d, 4-6b, 8g-a, 2e-3c, 11c-9, 1f-2d, 11d-14c, 19-16, 7-6c, 20-22
pal h'D2: 1a-2b, 15-14, 22-18e, 8-9, 17-18d, 16a-e, 11-13, 3g-2c,7-4, 10e-a, 23-24
pal n'D3:
pal h'E1: 1-2g, 4b-f, 12f-10c, 3f, 8g-10b, 3a-e, 8f-4c, 12g-13
pal h'F1: 1a-d, 9b-12, 3b-2f, 13-14c, 5d-6, 9a-7a, 14d-16, 5c-3c, 1e-2e, 17-23 i.e. as p'F1 of tentans
pal n'G4:
pal n'G5:
Found: ¿Ontario - South March, Carleton Co.
Saskatchewan - 5ml nw Theodore.
North Dakota - Cleveland
South Dakota - Vermillion, Clay Co.; Sioux Falls, Minnehaha Co.; Lake Francis Case,
Yankton
Co.
Generally at low frequency in prairie sloughs containing C. dilutus
Hein and Schmulbach (1971) first described this species in North America, noting that it was not the same as C. pallidivittatus Johannsen. The cytology of North American populations in comparison to that of European populations was described by Kiknadze et al. (1998a).