I'm betting this is Marpissa obtusa. Barnes 1958 describes the female from two specimens, whose
drawing you can see here (also found in Barnes 1958). Notice that the copulatory openings are angled towards each other, as in the above image. Barnes 1958 reports that the openings in lineata are aimed laterally, as
you can see here.
Compare this image with the M. lineata epigynum.
[This image replaces my original less-clear one.]
Contributed by
Joe Lapp on 30 June, 2011 - 7:29pm
Last updated 5 July, 2011 - 9:29pm