Species Details

Alypia ridingsii

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

Common NameRidings' or Mountain Forester IdentificationA medium-size (approx. 3 cm wingspan) diurnal jet black and cream moth. The forewings are black with a wide curved subterminal band and a large triangular basal patch of light cream. There is also a smaller square reniform spot, also cream. The pale areas are divided by a fine line of dark scales along each vein. Hindwings black with a large oblong cream patch in the center divided by a thick vertical black line. The black lining of the veins crossing the cream patches will separate ridingsii from all our other foresters except for the very similar but smaller (approx. 2.5 cm wingspan) Androloma maccullochii. Androloma males have a modified inflated costa containing a strip of membrane with vertical striations, giving the forewing costa a slightly convex shape. This is entirely lacking in ridingsii, which thus has a straight or slightly concave costa. The basal cream patch on the forewing of ridingsii extends only about halfway to the outer margin, but extends much further and almost meets the lower end of the subterminal band in maccullochii. The cream patches on the hindwings and in particular the basal patch is also larger in maccullochii, and the veins in the hindwing patch of maccullochii are more strongly lined with dark scales. Females are similar but lack the modified costa found in maccullochii.

Scientific Name Alypia ridingsii Common Name Ridings' or Mountain Forester Habitat This species is found at higher elevations in the mountains. Identification
A medium-size (approx. 3 cm wingspan) diurnal jet black and cream moth. The forewings are black with a wide curved subterminal band and a large triangular basal patch of light cream. There is also a smaller square…
A medium-size (approx. 3 cm wingspan) diurnal jet black and cream moth. The forewings are black with a wide curved subterminal band and a large triangular basal patch of light cream. There is also a smaller square reniform spot, also cream. The pale areas are divided by a fine line of dark scales along each vein. Hindwings black with a large oblong cream patch in the center divided by a thick vertical black line. The black lining of the veins crossing the cream patches will separate ridingsii from all our other foresters except for the very similar but smaller (approx. 2.5 cm wingspan) Androloma maccullochii. Androloma males have a modified inflated costa containing a strip of membrane with vertical striations, giving the forewing costa a slightly convex shape. This is entirely lacking in ridingsii, which thus has a straight or slightly concave costa. The basal cream patch on the forewing of ridingsii extends only about halfway to the outer margin, but extends much further and almost meets the lower end of the subterminal band in maccullochii. The cream patches on the hindwings and in particular the basal patch is also larger in maccullochii, and the veins in the hindwing patch of maccullochii are more strongly lined with dark scales. Females are similar but lack the modified costa found in maccullochii.
Life History Foresters are diurnal, and have a rapid buzzing flight. They undoubtedly have only a single brood, at least here in Alberta. Larvae apparently feed on evening primrose (Oenothera sp.) (Jones, 1951). Range
A western species, found at higher elevations in the mountains, north to Alaska and south through BC at least into the pacific northwestern states, west to Vancouver Island. There is a single Alberta record based on a…
A western species, found at higher elevations in the mountains, north to Alaska and south through BC at least into the pacific northwestern states, west to Vancouver Island. There is a single Alberta record based on a specimen found in the Shigematsu collection, collected at Highwood Pass July 7, 1968.
Notes
Ridings' Forester is a western species that barely reaches Alberta at higher elevations in the mountains along the BC border. It is largely replaced in Alberta by the very similar-appearing and much more common and…
Ridings' Forester is a western species that barely reaches Alberta at higher elevations in the mountains along the BC border. It is largely replaced in Alberta by the very similar-appearing and much more common and widespread Macculloch's Forester.

Citation

Page Citation for Alypia ridingsii

Page Citation

"Alypia ridingsii, University of Alberta E.H. Strickland Entomological Museum." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/2-6395. Accessed 29 Nov. 2021.

Taxonomic Hierarchy

Kingdom Animalia Phylum Arthropoda Class Hexapoda Subclass Insecta Order Lepidoptera Suborder Ditrysia Superfamily Noctuoidea Family Noctuidae Subfamily Agaristinae Genus Alypia Species Alypia ridingsii
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