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Montana Field Guide

Montana Field Guides

A Pyralid Moth - Crambus ainsliellus

Native Species

Global Rank: GNR
State Rank: SNR

Agency Status


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General Description
Crambus ainsliellus is a medium sized Crambus (21 - 29 mm wingspan). The forewing is yellowish-brown. The discal silvery stripe is broad, somewhat scimitar shaped, not crossed by dark brown lines and lacks a tooth on the underside of the stripe. The forewing lacks a sinuous white submedial line and a white patch beyond the stripe. The forewing base has a costal brown area that is reduced to a single line. The hindwing is grayish with a dirty white fringe (Powell and Opler 2009).

C. ainsliellus adults fly from August to September (Powell and Opler 2009).

Range Comments
C. ainsliellus is a North American species. It occurs in British Columbia, Manitoba, Washington, Montana, South Dakota, Iowa and Maine (Powell and Opler 2009).

Observations in Montana Natural Heritage Program Database
Number of Observations: 2

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Relative Density



(Observations spanning multiple months or years are excluded from time charts)

C. ainsliellus prefers grassland areas (Powell and Opler 2009).

Food Habits
Unknown, but probably grass roots (Powell and Opler, 2009).

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Citation for data on this website:
A Pyralid Moth — Crambus ainsliellus.  Montana Field Guide.  .  Retrieved on , from