NEW SPECIES OF THE MYRMECOPHILOUS GENERA MICRODONIA AND ECITOXENIDIA FROM MEXICO (COLEOPTERA, STAPHYLINIDAE) WITH A REVIEW OF PREVIOUSLY DESCRIBED SPECIES

The genera Microdonia and Ecitoxenidia are redescribed and illustrated . Keys are provided for the identification of all known species. Micro donia jacobsoni is described from Chiapas, Mexico where it is found wi th Neivamyrmex sumichrasti. M. mexicana is described from San Luis Pot osi, 3 km E. Xilitla, Mexico where it is also associated with N. sumic hrasti Ecitoxenidia ashei is described from Puebla, 4.7 km W. Nicholas Brave, Mexico where It is found with N. texanus. This is the first re cord of any myrmecophile associated with that species of ant. New Cost a Rican, Mexican, and U.S. localities are provided for some of the oth er species.