Bembidion hesperium
David R. Maddison
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
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.
Nomenclature
- Bembidion hesperium Casey 1918. Holotype male in MCZ.
- Bembidium hesperum Fall 1910
- Bembidion binarium Casey 1918
Title Illustrations
| Scientific Name | Bembidion hesperium |
|---|---|
| Location | Canada: British Columbia: Salmo River 4.8 km S of Salmo |
| Sex | Male |
| Image Use |
 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 copyright © 1995 David R. Maddison
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Bembidion hesperium .
Authored by
David R. Maddison.
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Citing this page:
Maddison, David R. 1995. Bembidion hesperium . 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/
