Abstract
Cryptochironomus imitans sp. n. from Lake Winnipeg, Manitoba, Canada, is described in all stages and both sexes. Six additional species of Cryptochironomus Kieffer, 1918 are recorded from Lake Winnipeg. C. stylifera (Johannsen, 1908) is shown to be a senior synonym of C. redekei Kruseman, 1933. The immatures of C. stylifera, C. digitatus (Malloch, 1915), C. ramus Mason, 1985, and C. curryi Mason, 1985, the male of C. ramus and the female of C. curryi are described or redescribed, and additional information given on imagines of C. stylifera, C. digitatus, C. curryi and C. blarina Townes, 1945. The male of a variety of C. ramus is described, and a pupa of C. eminentia Mason, 1985 figured. Keys are given to Nearctic males, pupae and larvae of Cryptochironomus. The distribution of Cryptochironomus in Lake Winnipeg is mapped and discussed. The separation of larval instars is shown approximately to follow Dyar’s rule.References
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