Hobbs 1987. On the identity of Astacus (Cambarus) mexicanus Erichson (1846) and Cambarus aztecus Saussure (1857) (Decapoda: Cambaridae) with the description of Procambarus olmecorum new species, from Veracruz, Mexico. Proceedings of the Biological Society of Washington, 100(1) 1987: 198-215