Reference

Alexander Gutbier (1915): On the biology of some solitary bees; on the classification and evolution of nests of bees and wasps (Hymenoptera: Aculeata). [The end]. [Ru; 1 fig. Date: [30].X.19153...]. – Lyubityel' Prirody (Petrograd) – 1915 (10): 289 - 292.