« Back to your search
Species Details
Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum Read more about this collection »
Common NameWilliams' Tiger
SeasonalityJune to late July.
IdentificationOne of the smallest members of the genus, with an average forewing length of ~17mm. The white forewing markings consist of the typical "W" mark, with two additional transverse lines (sometimes reduced). Note lack of fine white lines alongforewing veins. Hindwing color can vary from pink to yellow; boreal and prairie populations tend to have a dull yellowish hindwing.
Scientific Name
Grammia williamsii
Common Name
Williams' Tiger
Habitat
Found in montane grasslands, open jack pine forests and prairie habitats.
Seasonality
June to late July.
Identification
One of the smallest members of the genus, with an average forewing length of ~17mm. The white forewing markings consist of the typical "W" mark, with two additional transverse lines (sometimes reduced). Note lack of…
One of the smallest members of the genus, with an average forewing length of ~17mm. The white forewing markings consist of the typical "W" mark, with two additional transverse lines (sometimes reduced). Note lack of fine white lines alongforewing veins. Hindwing color can vary from pink to yellow; boreal and prairie populations tend to have a dull yellowish hindwing.
Life History
No information available.
Conservation
Common.
Diet Info
Probably a variety of herbaceous plants. In prairie habitats, larvae can be common on Golden Bean (Thermopsis rhombifolia) in May. Larvae have also been observed on Senecio sp. in montane meadows.
Range
New Brunswick to Alberta, B.C. and N.W.T., south to Arizona.
Citation
Page Citation for Grammia williamsii
Page Citation
"Species Details - Grammia williamsii, University of Alberta E.H. Strickland Entomological Museum." University of Alberta Museums Search Site, https://search-test.museums.ualberta.ca/g/2-243/9-246965. Accessed 02 Oct. 2025.
References
Author
Schmidt, B. C.
Title
The tiger moths (Arctiidae) of Alberta.
Publication Date
2000
Pages
36
Specimen Information
There are 315 specimens of this Species.
UASM12652 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Red Deer
Date Collected1923-07-03
UASM12616 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Hillcrest
Collected ByBowman, K.
Date Collected1918-07-05
UASM12627 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Hillcrest
Collected ByBowman, K.
Date Collected1919-06-21
UASM12628 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Hillcrest
Collected ByBowman, K.
Date Collected1919-06-21
UASM12634 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Hillcrest
Collected ByBowman, K.
Date Collected1919-06-21
UASM12641 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Hillcrest
Collected ByBowman, K.
Date Collected1919-06-21
UASM12646 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Hillcrest
Collected ByBowman, K.
Date Collected1921-06-24
UASM12647 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Hillcrest
Collected ByBowman, K.
Date Collected1918-06-22
UASM12654 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Hillcrest
Collected ByBowman, K.
Date Collected1919-06-21
UASM12662 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Hillcrest
Collected ByBowman, K.
Date Collected1919-06-21
UASM12668 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Hillcrest
Collected ByBowman, K.
Date Collected1919-06-21
UASM12631 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Medicine Hat
Collected ByBowman, K.
Date Collected1945-06-24
UASM12640 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Medicine Hat
Collected ByBowman, K.
Date Collected1945-06-24
UASM12626 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Nordegg
Collected ByBowman, K.
Date Collected1921-07-19
UASM12630 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Nordegg
Collected ByBowman, K.
Date Collected1918-07-17
UASM12636 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Nordegg
Collected ByBowman, K.
Date Collected1918-07-17
UASM12645 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Nordegg
Collected ByBowman, K.
Date Collected1923-07-29
UASM12648 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Nordegg
Collected ByBowman, K.
Date Collected1918-07-18
UASM12650 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Nordegg
Collected ByBowman, K.
Date Collected1936-06-01
UASM12659 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Nordegg
Collected ByBowman, K.
Date Collected1925-05-30
UASM12649 - Grammia williamsii
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Jasper National Park, Pocahontas
Collected ByBowman, K.
Date Collected1916-08-15