Cryptochironomus Kieffer from Lake Winnipeg, Canada, with a review of Nearctic species (Diptera: Chironomidae) Author Saether, Ole A. text Zootaxa 2009 2208 1 24 journal article 10.5281/zenodo.189776 53ee4a21-eaea-4f21-9ee5-9bf27756b451 1175-5326 189776 Cryptochironomus Kieffer As mentioned by Saether (1977a: 84) there are several problems of species separation and synonymies within the genus Cryptochironomus . The resolutions of a few of these are attempted below with the separation of some species of the C. fulvus -agglomerate and the description of some immatures. However, a thorough comparison between Nearctic and Palaearctic material is necessary to resolve most of the remaining problems. Saether (1977a: 87) mentions that several species of the Cryptochironomus fulvus agglomerate until now have not been separable as imagines. However, their pupae are quite distinct. One new species and a variety, which may be an additional species, are described below. In addition, drawings of Cryptochironomus ponderosus (Sublette) and a pupa of C. eminentia Mason are given. Sublette (1964: 131) redefines C. fulvus (Johannsen) and takes Chironomus sp. C of Malloch (1915: 529) to represent the pupa. However, Sublette (1964:132) states that the frontal tubercles in all his material are distinct while Townes (1945:99) states that the frontal tubercles are absent or perhaps sometimes present and very small. As it will appear from the key to male imagines, the frontal tubercles are a specific character usually, and Townes' material must have contained more than one species. It is quite likely that one or two species will fall as a synonym of Cryptochironomus mallochi ( Kieffer) (Kieffer 1919 : 191) , new name for C. abbreviatus ( Malloch) (Malloch 1915 : 451) or Cryptochironomus parvilamellatus ( Malloch) (Malloch 1915 : 479) .