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Wheeler (1938) has reported the presence in cavesin Yucatan of three species that at various times havebeen reported as troglobites. Erebomyrma urichi(Wheeler) was originally described from a cave onTrinidad and is known also from Cenote de Sambula(Motul), Yucatan. It is a pale species now known alsofrom endogean localities. Two other species areknown only from caves in the Yucatan Peninsula:Brachymyrmex cavernicola Wheeler from Grutas deBalankanche, Yucatan; and Paratrechina pearsei(Wheeler) from caves in Campeche, Quintana Roo,and Yucatan. Both of these species are pale yellowwith minute eyes. The latter species has been foundto occur only in darkness and is frequently takenfrom moist flowstone in the most remote parts ofthe caves. Wilson (1962) has discussed the ecologicstatus of these species and has convincingly arguedthe case against the existence of troglobitic ants.Family PompilidaeTwo genera of the spider wasps of the familyPompilidae have been collected from caves in Yucatan.Auplopus sp. was collected from Actun Chukum.Pepsis sp. was taken from total darkness in Cueva deAguacate while it was in battle with a theraphosidtarantula. The same genus was found in total darknessin ActUn Kaua, where the wasps flew at thecollectors, apparently attracted by their lights.Family VespidaeThe vespid wasp Polybia diguetana Buysson wascollected from nests in the entrance areas of Cenotede Ek Bis, Campeche, and Actun Kaua, Yucatan.Phylum ChordataClass TeleosteiThe blind fish of the caves of Mexico have excitedgreater interest than any other group of animals to befound in the caves of North America. The genusAstyanax is certainly the best studied of all cavernicoles.In addition to the five species of troglobiticfish discussed in detail below, 16 other species offish have been recorded from Mexican caves (seeTable 31). Some of these are troglophiles, whileothers are probably accidentals or trogloxenes.Order CypriniforrnesFamily CharacidaeAstyanax jordani (Hubbs and Innes)Anoptichthys jordani Hubbs and Innes, 1936:5-7,pI. 1; Hykes, 1937:108-109; Innes, 1937:200-202; Jordan, 1937:203-204; Greenberg, 1938:80;Hubbs, 1938:261, 264, 271, 275; Bridges, 1940:74-97, map; De Buen, 1940:8; Gresser and Breder,1940:113-116, pI. 1-3; Breder and Gresser, 1941b:123-130, fig. 1-2, pI. 1-4; Anonymous, 1942a:221;Breder, 1942:7, 11-14, fig. 2, 5; Osorio Tafall,1942:206;Walls, 1942:210, 387; Breder, 1943a:26­30; Breder, 1943b:82; Breder, 1943c:168-176;Breder and Rasquin, 1943:169-200, fig. 1-9, pI.1-3; Bridges, 1943:82-90; Hubbs, 1943: 121; OsorioTafall, 1943:44, 55, 57-67, 68, 69; Anonymous,1945:70; Barbour, 1945a:77;Barbour, 1945b:189;Benn, 1945:12; Breder, 1945:95·100, fig. 1-2, pI.1; Alvarez,l946:263, 264, 265, 267, 268, 270, 271,272,273,274-275,276,280,281, fig. 2-8; De Buen,1946:127; Jordan, 1946:198; Pavan, 1946:358;Rasquin, 1946:578-579; Alvarez, 1947:219; Brederand Rasquin, 1947a:323-351, fig. 1-9; Brederand Rasquin, 1947b:29-33; Nigrelli, 1947:105,108, pI. \11(fig. 38); Rasquin, 1945:35-42, fig. 1,pI. 1; Schlagel and Breder, 1947:17-27, fig. 2;Allee et al., 1949:612, 674, 675, fig. 247B-C;Rasquin, 1949a:499-531, fig. 4-5, 7, pI. 20-21,23; Rasquin, 1949b:131, 133; Alvarez, 1950:Table 30.-Summary of cave inhabiting Chordata.TroglobitesOther Species*Teleostei 5 16AmphibiaUrodelaAmbystomatidae 0 1Plethodontidae 0 9AnuraBufonidae 0 4Hylidae 0 6Leptodactylidae 0 17Ranidae 0 1Rhynophrynidae 0 1ReptiliaCheloniaKinostemidae 0 3SquamataBoidae 0 1Colubridae 0 5Crotalidae 0 2Gekkonidae 0 219uanidae 0 5Teiidae 0 1Xanthusiidae 0 3AvesFalconifonnesCathartidae 0 1PsittacifonnesPsittacidae 0 2PodicipitifonnesPodicipitidae 0 1238