Explanation of Names
Perhaps named for a famous Roman Woman
, Ummidia Quadratilla.
saddle-like depression on tibia of third leg
Virginia south to Florida, west to Arizona, also neotropics.
Predatory on terrestrial invertebrates
Dig tunnel in ground and seal with a silk-hinged lid. They hide under this lid and make forays out when prey is sensed, presumably by vibration. Males are often found wandering in late spring, presumably looking for mates.
Roddy, L. R. (1957). Some spiders from southeastern Louisiana. Transactions of the American Microscopical Society 76: 285-295.
Chamberlin, R. V. & Ivie, W. (1945a). On some Nearctic mygalomorph spiders. Annals of the Entomological Society of America 38: 549-558.
Photo from Baja California
--the well-concealed trapdoor