D. nigrifrons (Folsom, 1937)

– Isotoma (Isotoma) nigrifrons Folsom, 1937: 105

BC Addison et al. 2003, cf.

MB Aitchison 1979, cf.; Lindo 2014

ON Skidmore 1995; Huebner et al. 2012

QC Therrien et al. 1999, 1999a; Chagnon et al. 2000, 2001a

Remarks: Skidmore’s record of this species for ON is probably based on James’s record (1933) for I. nigra (see remarks on the latter).

General distribution: Nearctic.