Bicinctus-Group of the Genus Cricotopus Van der Wulp (Diptera: Chironomidae) in the Nearctic with a Description of a New Species

Three species, Cricotopus bicinctus (Meigen), C. vierriensis Goetghebuer, and C. mackenziensis n.sp., in the bicinctus-group of the genus Cricotopus Van der Wulp are now known to occur in the Nearctic. The new species is described from the Fort Simpson area, Northwest Territories, and compared with a closely related species, Cricotopus (s.s.) bicinctus. Most of the differences between the two species are related to the smaller size of C. mackenziensis.