dcsimg

Conservation Status

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Not of concern.
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Cyclicity

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Adults fly in mid to late June in Alberta.
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Distribution

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Nova Scotia to central BC. In Alberta, occurs in the major river valleys of the prairies, and north to Athabasca and Fort McMurray. (McGuffin 1987). Although McGuffin (1987) reports this species from the central boreal region in Alberta, extensive surveying in recent years has failed to turn up T. cachexiata in the Boreal forest region in the province; all recent records are from the major river valleys of the southern prairies.
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General Description

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"A large cream white, nearly immaculate geometrid moth; the only wing markings consist of a straight, tan transverse line from the apex to the anal margin of the forewing. Hindwings unmarked. The straight PM line and absence of other prominent wing markings will identify the two Tetracis species. T. cachexiata is much paler than T. crocallata, and lacks a discal spot and the dusting of dark scales found in crocallata. "
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Habitat

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Deciduous boreal forest and prairie riparian woodlands in Alberta.
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Life Cycle

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The caterpillar is variably marked with tan, brown and black, bearing several small dorsal warts. The second thoracic segment is conspicuously thickened, giving the caterpillar a convincing "broken-twig" appearance (Wagner et al. 2001). Adults come to light, and pupae overwinter.
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Trophic Strategy

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Larvae are generalists on deciduous trees and shrubs (occasionally conifers in the East). Recorded hosts which occur in Alberta include alder (Alnus), birch (Betula), cherry (Prunus), poplar (Populus), Viburnum and willow (Salix) (Wagner et al. 2001).
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Tetracis cachexiata

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Tetracis cachexiata, the white slant-line or white slaut,[1] is a moth of the family Geometridae. The species was first described by Achille Guenée in 1858. It is found in North America from Nova Scotia to central British Columbia, south to northern Florida and west to Montana and northern Colorado.

The length of the forewings 19–26 mm. Adults are on wing from May to early July.

The larvae feed on various plants including Alnus, Betula, Prunus, Salix, Tilia, Ulmus, Viburnum, Abies, Larix, Pinus, and Tsuga species.

References

  1. ^ White Slaut, Natural Resources Canada

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Tetracis cachexiata: Brief Summary

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Tetracis cachexiata, the white slant-line or white slaut, is a moth of the family Geometridae. The species was first described by Achille Guenée in 1858. It is found in North America from Nova Scotia to central British Columbia, south to northern Florida and west to Montana and northern Colorado.

The length of the forewings 19–26 mm. Adults are on wing from May to early July.

The larvae feed on various plants including Alnus, Betula, Prunus, Salix, Tilia, Ulmus, Viburnum, Abies, Larix, Pinus, and Tsuga species.

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