THEM! (which is to say, large ants)

so, i've killed a couple of ants over the past few days. i'm used to plain old sugar ants, but these are big bastards. pic behind the cut.
( ant! )

i've already washed the floor where i saw them, to discourage ant trails. but is this a "call the exterminator" ant? or just a regular old "god damned those fucking ants" kind of ant?