Apantesis behrii

(Stretch, 1872)

Apantesis behrii is a tiger moth in the Erebidae, first described by Stretch in 1872. The occurs in the western United States from Oregon south through California, with highest abundance in the Siskiyou and Sierra Nevada mountain ranges. It inhabits dry, rocky mountain environments and has a narrow period from early August to late September. Larvae feed on specific plants including Lotus humistratus and Amsinckia species. The species was transferred from the Grammia to Apantesis based on phylogenetic revision.

Apantesis behrii by no rights reserved. Used under a CC0 license.

Pronunciation

How to pronounce Apantesis behrii: //əˈpæn.tə.sɪs ˈbɛə.raɪ//

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Identification

Identification to level requires examination of genitalia and comparison with closely related Apantesis species. The geographic range in the Siskiyou and Sierra Nevada ranges, combined with the late summer period (August-September), helps distinguish it from sympatric . Formerly classified in Grammia, specimens may be encountered under that in older collections.

Images

Appearance

have a wingspan of approximately 34 mm. As a tiger moth in the Arctiinae, it likely exhibits the typical pattern of bold contrasting markings on forewings and often brightly colored hindwings, though specific coloration details require direct specimen examination.

Habitat

Dry lithosol flood plains and balds in mountainous terrain. The is associated with rocky, well-drained substrates at elevation in the Siskiyou and Sierra Nevada ranges.

Distribution

Western North America from Oregon south to California. Most common in the Siskiyou Mountains of southern Oregon/northern California and the Sierra Nevada range of California.

Seasonality

are on wing from early August to late September. The narrow window suggests a with a single per year.

Diet

Larvae feed on Lotus humistratus (a legume) and Amsinckia (fiddlenecks, Boraginaceae). feeding habits are not documented.

Host Associations

Lotus humistratus - larval food plantLegume
Amsinckia - larval food plantMultiple in Boraginaceae used

Life Cycle

Complete with , larva, pupa, and stages. Specific details of egg deposition, larval instars, stage, and site are not documented. The late summer adult suggests larvae develop through spring and early summer.

Similar Taxa

Apantesis phalerataOverlapping western North American range; requires genitalia examination for separation
Apantesis carlottaSympatric in California; distinguished by subtle wing pattern differences and genitalia
Grammia speciesFormerly classified in this ; A. behrii was transferred to Apantesis along with other former Grammia , creating potential confusion with older literature and collections

More Details

Taxonomic History

This was originally described as Arctia behrii by Stretch in 1872, later placed in Grammia, and subsequently transferred to Apantesis as part of a broader revision that consolidated the Grammia, Holarctia, and Notarctia into Apantesis.

Conservation Status

Not formally assessed. The restricted montane distribution and specific requirements (dry lithosol balds) may increase vulnerability to climate change and habitat alteration, though trends are unknown.