From caves and springs in northern Mexico (Tamaulipas and Coahuila), mostly explored by diving, seven species of stigobitic and troglomorphic cirolanids were sampled: four species of Speocirolana Bolivar (one of them, interesting in several respects, described s new), the two known species of Sphaerolana Cole & Minckley, and Cirolanides texensis Benedict. For all six already known species, the localities are new, and aditional information is provided on their morphology, variability, and relationships. With 15 described species, Mexico has a quite remarkable and varied assemblage of subterranean Cirolanidae, pointing to quite diverse marine ancestors.