A relatively rare species only found in forest margins as well as open habitats. The hosts include several species of mason bees Osmia. The genus can be recognised by the lack of a frontal carina and the lack of apical teeth along hind margin of T3. C. radians can be separated from C. hirsuta by the lack of long dark hairs of T3, and the more scattered punctation of the tergites.
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Juho Paukkunen
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Alexander Berg
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Villu Soon
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Frode Ødegaard
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Paolo Rosa
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NTNU Vitenskapsmuseet
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Norsk institutt for naturforskning
