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Bembidion hesperium Fall 1910

David R. Maddison
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Containing group: Bembidion (Bracteon)

Adult External Characteristics

The darkest Bracteon. The very shiny surface obscures the mirrors, which are sometimes only evident as patches of different metallic colors, rather than as differences in luster. Mirrors present on intervals 3 through 5. Dorsal surface of elytra with sculpticells generally transverse (isodiametric only in deeply microsculptured females). Stria 3 of elytra abruptly deeper around silver spots. Pronotum with carina short or absent, lacking midlateral seta, stria 3. Basal portions of femora rufous.

Male Genitalia

Aedeagus with wide apex, right CSC lobe at most slightly ridged

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Left: Lateral view. Right: Central Sclerite Complex

Comparison with Related Species

Compare with:

Adults of this species are the darkest Bracteon, and, along with B. semenovi, the shiniest. Most similar to B. lorquinii, with which it shares the lack of the midlateral seta of the pronotum. Besides luster, color, and genitalia, specimens can be distinguished by the more deeply engraved and punctate striae, smaller size, and proportionally wider body. Genitalic differences are described under B. lorquinii.

Geographic Variation

Specimens from the south (e.g., northern California) tend to be shinier, with more-transverse elytral sculpticells, and with flatter pronota with less rounded sides than specimens from the north (e.g., northern Washington).

Geographic Distribution

Restricted to western North America, from around San Francisco, California, north to Washington, and in southernmost British Columbia, Canada.

Habitat

Known only from the sandy banks of rivers; occasionally among vegetation.

Nomenclature

Other Names for Bembidion hesperium Fall 1910

Title Illustrations
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Scientific Name Bembidion hesperium
Location Canada: British Columbia: Salmo River 4.8 km S of Salmo
Sex Male
Image Use creative commons This media file is licensed under the Creative Commons Attribution License - Version 3.0.
Copyright © 2004 David R. Maddison
About This Page

David R. Maddison
Oregon State University

Page: Tree of Life Bembidion hesperium Fall 1910. Authored by David R. Maddison. The TEXT of this page is licensed under the Creative Commons Attribution License - Version 3.0. Note that images and other media featured on this page are each governed by their own license, and they may or may not be available for reuse. Click on an image or a media link to access the media data window, which provides the relevant licensing information. For the general terms and conditions of ToL material reuse and redistribution, please see the Tree of Life Copyright Policies.

Citing this page:

Maddison, David R. 1995. Bembidion hesperium Fall 1910. Version 01 January 1995 (under construction). http://tolweb.org/Bembidion_hesperium/396/1995.01.01 in The Tree of Life Web Project, http://tolweb.org/

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