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SUMMARY
The karyotypes of thirteen species of Uruguayan ants belonging to three different subfamilies (Myrmicinae, Dolichoderinae and Formicinae) are reported. Among eight myrmicines studied, the chromosome numbers of four species of Pheidole (P. cornutula, P. fallax, P. spinninodis and P. strobeli) were all 2n = 20 (or n = 10). A count of 2n = 32 (or n=16) was obtained for Solenopsis saevissima, while 2n = 38 occurred in three leaf-cutter ants of the genus Acromyrmex [A. (Acromyrmex) ambiguus, A. (A.) hispidus and A. (Moellerius) heyeri]. The one dolichoderinae ant examined, Conomyrma pyramica, had 2n = 18 and three species of Camponotus, C. bonariensis, C. punctulatus and C. rufipes (Formicinae), showed a relatively high number 2n = 40 (or n=20) compared to that in C. mus (2n = 26).
