none. As a part of the taxonomical and biological research of the Araneomorpha spiders from San Francisco Oxtotilpan, State of Mexico, three associations between spiders and wasps are described: the genus Tromatobia (Fam., Ichneumonidae) as a predator of Araneus thaddeus eggs (Araneidae); the genus Zatypota (Fam., Ichneumonidae) as a parasitoid of Theridion contreras (Fam., Theridiidae) and a new species of the genus Idris (Scelionidae) as an endoparasitoid of Pardosa ca. flavipalpis (Fam., Lyeosidae).