– Sixty-eight spp. of Odon. are at present known from the Yucatan Peninsula, the present paper adding 25 spp. and mahy .new localities to the published record. Protoneura corculum, Argia gaumeri, Anax concolor, A. junius, Coryphaeschna new. sp. Macrodiplax balteata, Micrathyria hageni, Perithemis intensa, P. mooma, Tramea binotata and T. lacerata are discussed in greater detail.