Bembidion hesperiumDavid R. Maddison
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.
Aedeagus with wide apex, right CSC lobe at most slightly ridged
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.
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).
Restricted to western North America, from around San Francisco, California, north to Washington, and in southernmost British Columbia, Canada.
David R. Maddison
Oregon State University
Page copyright © 1995 David R. Maddison
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Citing this page:
Maddison, David R. 1995. Bembidion hesperium http://tolweb.org/Bembidion_hesperium/396/1995.01.01 in The Tree of Life Web Project, http://tolweb.org/. Version 01 January 1995 (under construction).