1. Nest burrows of the silk bee Colletes daviesanus and other solitary bees and wasps in Quaternary volcanic tephra of the Eifel in Germany -- 2. Renting of nest burrows of the silk bee Colletes daviesanus by the mason bee Osmia adunca and other solitary
bees and wasps in Eifel, Saar area and Palatinate in Germany -- 3. Nest burrows of the mud wasp Odynerus spinipes in Buntsandstein and Quarternary in Eifel, Saar area and Palatinate in Germany.
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