Formosa Carpet Moth
Dysstroma formosa (Hulst, 1896)
Family: Geometridae
Subfamily: Lymantriinae
Identification: dult [gray form]: forewing pale brownish-gray with darker gray median area; basal area with fairly straight dark gray band beginning at inner margin and stopping short of the costa (the band is diffuse and does not extend to the AM line); AM and PM lines jagged, irregular; short black streak in median area is slightly closer to PM line than AM line; ST line broken in middle and consisting of a series of arcs filled with gray or brown; short black diagonal streak at apex
Adult [orange form]: as above, except median area mostly brownish-orange, dark gray band in basal area edged with orange distally, and PM line with deep V-shaped cleft near costa
There is also an intermediate form with a gray median area but brownish basal and subterminal areas; hindwing of all forms uniformly-colored but varying from pale yellowish-gray to almost white
Wing Span: 2.4-3.1 cm
Life History:
Flight: midsummer
Caterpillar Hosts: leaves of currant and gooseberry (Ribes spp.)
Adult Food:
Habitat:
Range: In Canada, reported from Newfoundland and New Brunswick in the east, and Saskatchwan to BC and Yukon in the west. Presumably occurs in adjacent areas of United States, including Alaska [records from the web come from New York, Utah, and California].
Conservation:
NCGR:
Management Needs:
Comments:
Taxonomy Notes: None.
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Verified Sightings
Displaying 1 - 8 of 8 verified sightings
Observation date: Jun 29, 2021
Submitted by: Dwaine Wagoner
Region: Natrona County, Wyoming, United States
Verified by: J_Martineau
Verified date: Dec 01, 2021
Observation date: Jul 04, 2021
Submitted by: Dwaine Wagoner
Region: Natrona County, Wyoming, United States
Verified by: J_Martineau
Verified date: Nov 01, 2021
Observation date: Jul 11, 2021
Submitted by: frogbandit
Region: Anchorage, Alaska, United States
Verified by: davidwdroppers
Verified date: Sep 11, 2021
Observation date: Aug 14, 2015
Submitted by: J_Martineau
Region: Sheridan County, Wyoming, United States
Verified by: J_Martineau
Verified date: Apr 13, 2020
Observation date: Jul 21, 2019
Submitted by: jrmbutterfly
Region: British Columbia, Canada
Verified by: davidwdroppers
Verified date: Jul 27, 2019
Observation date: Jul 21, 2019
Submitted by: jrmbutterfly
Region: British Columbia, Canada
Verified by: davidwdroppers
Verified date: Jul 22, 2019
Observation date: Jul 01, 2019
Submitted by: jrmbutterfly
Region: British Columbia, Canada
Verified by: davidwdroppers
Verified date: Jul 13, 2019
Observation date: Jul 10, 2017
Submitted by: bobscafe
Region: British Columbia, Canada
Verified by: davidwdroppers
Verified date: Aug 16, 2017