Bembidion inaequaleDavid R. Maddison
Distinct mirrors present on intervals 2 through 7; outer mirrors on intervals 6 and 7 near posterior silver spots, in many specimens isolated from inner mirrors. Pronotum without a long basilateral carina, with or without a midlateral seta (specimens in eastern populations generally lack the midlateral seta).
Aedeagus with prominent ventral bulge and hooked apex; Ventral Sclerite Patch scaly, as in B. levettei.
Adults are generally smaller than those of B. levettei, from which they differ externally by small silver spots, and the mirror on elytral intervals 6 and 7 being positioned further posteriorly, near the posterior silver spot. Generally the outer mirror is a small spot, isolated from the inner mirrors, but in some specimens it is broadly connected to inner mirrors. Eastern members of B. inaequale are more readily distinguished from B. levettei specimens by the narrow forebody with deeply punctured striae, pale tibia, and lack of a midlateral seta on the pronotum. See Separating B. inaequale from B. levettei for pictures.
A variable species. Specimens from east of the Great Plains are shinier, with narrower body, deep elytral punctures, lack the midlateral seta of the pronotum, and have paler legs. Specimens from Alberta are much larger and broader, with a reddish cast, smaller silver spots, more extensive mirrors, and generally with a midlateral pronotal seta. Specimens from the western mountains are similar to those from Alberta, but are darker and smaller.
Widely distributed in North America from Nova Scotia, south to Georgia and Alabama, west to Colorado and California, north to Alaska.
David R. Maddison
Oregon State University
Page copyright © 1995 David R. Maddison
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Citing this page:
Maddison, David R. 1995. Bembidion inaequale http://tolweb.org/Bembidion_inaequale/403/1995.01.01 in The Tree of Life Web Project, http://tolweb.org/. Version 01 January 1995 (under construction).