Caption:
Three spiders from the genus Theridion, as illustrated by Carl Wilhelm Hahn in his Monographia Aranearum, also known as Monographie der Spinnen, in the 1820s. Spider A is a cobweb spider, found in Europe and North America. Spider B is now known as Pachygnatha clercki, a long-jawed orb weaver. Spider C is Enoplognatha ovata, native to Europe, but now found in North America as well.