This is one of the more common, but still undescribed, Theridiids in the subfamily Hadrotarsinae. It is found sometimes on fence palings in small messy webs. Its prey includes ants. Thanks to Helen Smith for help with ID. Female body length about 1-2mm, males about 1mm.
Female adult 23110
Photo: Robert Whyte
Female adult underneath 23110 showing epigyne
Photo: Robert Whyte