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A Character Analysis of a Solitary Bee, Hoplitis albifrons (Hymenoptera, Megachilidae)

Charles D. Michener
Evolution
Vol. 1, No. 3 (Sep., 1947), pp. 172-185
DOI: 10.2307/2405493
Stable URL: http://www.jstor.org/stable/2405493
Page Count: 14
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A Character Analysis of a Solitary Bee, Hoplitis albifrons (Hymenoptera, Megachilidae)
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Abstract

The geographical variation of 30 populations of the solitary bee, Hoplitis albifrons (Kirby), is analyzed. The hair color of four selected parts of the body of females varies from prevailingly white to mostly dark. In three characters there is a general cline from dark extreme in southern California to a much lighter coloration in the northern and eastern parts of the range. The Cascadian populations, which connect the dark Californian race with the paler northern races, are extremely variable. In some areas there is polymorphism in the shape of the antennae. The role of the Pleistocene in this distribution pattern is discussed.

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