Abstract

The nesting behavior of the spider wasp Calopompilus pyrrhomelas (Hymenoptera: Pompilidae: Pepsini) is described for the first time based on independent observations and photographic series from Oak¬land, Alameda County, CA; Denio, Humboldt County, NV; and Tamalpais-Homestead Valley, Marin County, CA, respectively. The three wasps captured, immobilized, and provisioned the spider’s own burrows with Cal¬isoga longitarsis (Simon) (Nemesiidae) and Antrodiaetus montanus (Chamberlin and Ivie) (Antrodiaetidae).

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