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Species Details
Metanema determinata
University of Alberta E.H. Strickland Entomological Museum Read more about this collection »
Common NameDark-banded Thorn, Dark Metanema
SeasonalityFlies from mid May to mid July, most common in the latter half of June.
IdentificationWings two-toned grey with two straight, yellow-tan transverse lines on the forewing. Median area between AM and PM lines darker grey. Black forewing discal spot small or absent.
Similar to M. inatomaria, which lacks the darker contrasting band between the two transverse lines and has yellow scales within the dark discal spot (determinata has an all-black discal spot).
Scientific Name
Metanema determinata
Common Name
Dark-banded Thorn, Dark Metanema
Habitat
Deciduous and mixedwood forests and woodlands.
Seasonality
Flies from mid May to mid July, most common in the latter half of June.
Identification
Wings two-toned grey with two straight, yellow-tan transverse lines on the forewing. Median area between AM and PM lines darker grey. Black forewing discal spot small or absent.
Similar to M. inatomaria, which lacks…
Wings two-toned grey with two straight, yellow-tan transverse lines on the forewing. Median area between AM and PM lines darker grey. Black forewing discal spot small or absent.
Similar to M. inatomaria, which lacks the darker contrasting band between the two transverse lines and has yellow scales within the dark discal spot (determinata has an all-black discal spot).
Life History
The mottled brown-grey and slightly flattened larva blends in well with tree bark. The pupa overwinters (Wagner et al 2001). Adults fly up when disturbed during the day, and also come to light at night.
Conservation
Not of concern.
Diet Info
Larvae feed on willows (Salix spp.) (Prentice 1963).
Range
Found throughout most of North America, from the Yukon, NWT and central BC east to Nova Scotia, south to MD, NE and NM (McGuffin 1987, Wagner et al. 2001).
Citation
Page Citation for Metanema determinata
Page Citation
"Species Details - Metanema determinata, University of Alberta E.H. Strickland Entomological Museum." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/2-4302/9-15061. Accessed 16 Feb. 2025.
References
Author
Wagner, D.L, D.L. Ferguson, T.L. McCabe and R.C. Reardon
Title
Geometroid Caterpillars of Northeastern and Appalachian Forests
Publication Date
2001
Pages
239
Author
McGuffin, W. C.
Title
Guide to the Geometridae of Canada (Lepidoptera): II. Subfamily Ennominae, 4
Publication Date
1987
Series Title
Memoirs of the Entomological Society of Canada
Volume
138
Pages
182
Specimen Information
There are 108 specimens of this Species.
UASM7068 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Tofield
Collected BySchmidt, B. C.
Date Collected2000-06-13
UASM7356 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Tofield
Collected BySchmidt, B. C.
Date Collected2000-06-20
UASM10201 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Edmonton
Date Collected1918-06-23
UASM10202 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Edmonton
Collected ByBowman, K.
Date Collected1944-04-25
UASM10203 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Edmonton
Date Collected1918-06-22
UASM10204 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Edmonton
Collected ByBowman, K.
Date Collected1924-06-13
UASM10205 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Edmonton
Date Collected1919-05-25
UASM10206 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Red Deer
Collected ByCrosby, G. C. S.
Date Collected1923-06-10
UASM10209 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Edmonton
Date Collected1917-05-25
UASM10211 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Edmonton
Collected ByBowman, K.
Date Collected1943-06-29
UASM10212 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Edmonton
Date Collected1917-06-16
UASM10213 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Edmonton
Date Collected1915-05-20
UASM10215 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Red Deer
Collected ByCrosby, G. C. S.
Date Collected1923-06-26
UASM10219 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Edmonton
Date Collected1917-06-15
UASM10220 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Edmonton
Collected ByBowman, K.
Date Collected1944-05-30
UASM10222 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Edmonton
Date Collected1915-07-13
UASM10224 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Edmonton
Date Collected1915-05-20
UASM10225 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Edmonton
Collected ByBowman, K.
Date Collected1943-06-14
UASM10323 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Edmonton
Collected ByBowman, K.
Date Collected1946-05-27
UASM10398 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Jasper National Park, Pocahontas
Collected ByBowman, K.
Date Collected1917-06-15
UASM10550 - Metanema determinata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Jasper National Park, Pocahontas
Collected ByBowman, K.
Date Collected1917-06-15