Species Details

Digrammia neptaria

University of Alberta E.H. Strickland Entomological Museum Read more about this collection »

Common NameDark-bordered Granite SeasonalityMid June to late September; double brooded in the south. IdentificationGround colour light grey with some dark grey speckling, particularly on the hindwing. Nearly straight two-toned AM and PM lines, the AM line usually less distinct. Faint median line and a well-defined discal spot. Similar to the faintly-marked form of D. rippertaria, but rippertaria has a two-toned, less sinuous PM line. D. mellistrigata is smaller overall, and the PM line has a sharp break near the costa and angles back toward the wing base. The occasional specimen may lack the wing markings altogether.

Scientific Name Digrammia neptaria Common Name Dark-bordered Granite Seasonality Mid June to late September; double brooded in the south. Identification
Ground colour light grey with some dark grey speckling, particularly on the hindwing. Nearly straight two-toned AM and PM lines, the AM line usually less distinct. Faint median line and a well-defined discal spot.…
Ground colour light grey with some dark grey speckling, particularly on the hindwing. Nearly straight two-toned AM and PM lines, the AM line usually less distinct. Faint median line and a well-defined discal spot. Similar to the faintly-marked form of D. rippertaria, but rippertaria has a two-toned, less sinuous PM line. D. mellistrigata is smaller overall, and the PM line has a sharp break near the costa and angles back toward the wing base. The occasional specimen may lack the wing markings altogether.
Life History
The immature stages are described by McGuffin (1972). Pupae of the second generation hatch in about 12 days. Adults come to light. Although the larval hosts are widespread, this is an uncommon and local insect in…
The immature stages are described by McGuffin (1972). Pupae of the second generation hatch in about 12 days. Adults come to light. Although the larval hosts are widespread, this is an uncommon and local insect in Alberta, and is apparently absent from much of the central forested regions. Given this species supposed larval host preference for such widespread plants as poplars and willows, the distribution and occurrence of neptaria is enigmatic: it ranges throughout most of Canada, yet in Alberta it appears to be absent (or at least very localized) throughout most of the central part of the province, having been recorded from Medicine Hat and Crowsnest Pass in the south, then again near the Richardson River Dunes in the extreme northeast. The extreme northern records may in fact be isolated populations in the xeric habitat of the Athabasca sand dunes and Peace River grasslands in Alberta, and the Atlin area in NW BC. Forbes (1948) also commented on neptaria's rarity in New England, and suggested it may be restricted to sand dune habitats. Occurs on pine barrens in Nova Scotia (Ferguson 1954).
Conservation No obvious concerns. Diet Info Larvae feed on willows (Salix) and poplars (Populus) (McGuffin 1972). Range Yukon and southwestern NWT to Newfoundland, south to California and New Hampshire (McGuffin 1972).

Citation

Page Citation for Digrammia neptaria

Page Citation

"Digrammia neptaria, University of Alberta E.H. Strickland Entomological Museum." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/2-4665. Accessed 20 Jun. 2021.

Taxonomic Hierarchy

Kingdom Animalia Phylum Arthropoda Class Hexapoda Subclass Insecta Order Lepidoptera Suborder Ditrysia Superfamily Geometroidea Family Geometridae Subfamily Ennominae Tribe Semiothisini Genus Digrammia Species Digrammia neptaria
This hierarchy is created from our museum records, it may not always accurately reflect modern taxonomies.

Taxonomic Hierarchy for University of Alberta E.H. Strickland Entomological Museum