Steatoda fallax is a species of spiders of the family Theridiidae that is endemic in Cape Verde. The species was first described as Theridion fallax by John Blackwall in 1865.
References
Further reading Blackwall (1865) Descriptions of recently discovered spiders collected in the Cape de Verde Islands by John Gray, Esq. Annals and Magazine of Natural History, ser. 3, vol. 16, p. 80-101