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Some aspects of the biology of the wasp Chalybion spinolae are documented. This includes behaviour relating to life cycles, nesting, mating, oviposition and prey interaction of this wasp. The physical appearance of the wasps and their prey are described and some measurements are given. The prey of C. spinolae are two species of spiders, Latrodectus indistinctus and Latrodectus geometricus (Araneae: Theridiidae). The observations spanned a period of 5 years, and involved approximately 200 wasp nests. This study serves to provide more observational information about the biology of the wasp and its predatory behaviour.