D. canadensis (Brown, 1932)

– Isotoma olivacea var. canadensis Brown, 1932: 334

NU Brown 1932; Davis 1936; Christiansen & Bellinger 1980, 1998; Skidmore 1995; Babenko & Fjellberg 2006

Remarks: Nobody has seen this species since its description by Brown although it was “one of the most widely distributed species in [his] collection” (Brown 1932, p. 335). It may be a senior synonym of some other northern species, for instance D. tshernovi .

General distribution: Nearctic.