Similar to Habronestes bradleyi, but that its appearance and behaviour is changed to mimic another ant species, Camponotus aeneopilosus. The two spiders were found on the same wall. A colony of each host ant was also present there.
I think your description of its behaviour with ant species and its appearance correspond to the lower image of the gnaphosid genus Eilica, referring to Robert Whyte and Greg Anderson's field guide, page 153.