Size
Females: 3.0-9.0 mm; Males: 2.8-6.5 mm.
(1)See Also
Theridion - Enoplognatha has the four bottom eyes almost straight across. This leaves very little space between the top row of eyes and the bottom row of eyes. Genus Theridion has a slight downward curve to the bottom row of eyes which leave more of a gap between the top and bottom rows. See them below:
Theridion           Enoplognatha
Print References
The Spider Genera Enoplognatha, Theridion and Paidisca in America North of Mexico, Levi revision in Bulletin of the American Museum of Natural History (1957) - link to large pdf file which may require a long download time.