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of small soil inhabiting japygoids has been found inseveral caves in Mexico and Guatemala, but the specimensall remain unstudied.Order ArchaeognathaFamily MachilidaeMachilids are seldom collected in caves, and onlyone species has been found in a Mexican cave. An unidentifiedspecies was collected below the entrancedrop of Sotano de Gomez Farias, Tamaulipas. Carefulstudy of the litter in the vicinity of entrances shouldreveal additional machilids.Order ThysanuraFamily LepismatidaeTwo species of the family Lepismatidae have beenidentified from caves in Mexico. Allacrotelsa spinulata(Packard) was collected from cave swallow guanoin the entrance of Cueva del Salitre, Chihuahua. Wygodzinsky(1972) reported Ctenolepisma ciliata (Dufour)from the entrance area of Cueva del Diablo,Chihuahua. Both species are probably trogloxenes oraccidentals.Family NicoletiidaeThe family Nicoletiidae is a frequently encounteredgroup in the caves of Mexico and Central America.Numerous species of troglobite and troglophilehave been collected from all parts of this area, butwith one exception they await description. Troglobiticthysanurans are usually found running alongclay or silt banks or on the cave walls. The troglophilicspecies are more commonly found on thecave floor under and among debris and rocks. A recordof the troglobitic species, Texoreddellia texensis (Ulrich),from Grutas de Quintero, Tamaulipas (Paclt,1971) is in error. Texoreddellia is a genus describedby Wygodzinsky (1973) for a highly evolved troglobitefrom Central Texas. Although known fromnumerous caves in Texas, it has not been reliablyreported from Mexico. Wygodzinsky (1973) reportsthat he has considerable material from Grutas deQuintero, none of which is Texoreddellia. The speciesprobably occurs in northern Coahuila. A single individual,which could not be captured, was seen inCueva de los Lagos, Coahuila, immediately across theilio Grande from caves inhabited by T. texensis.Unfortunately, this cave is now inundated by thewaters of the Amistad Reservoir.Anelpistina anophthalma (Bilimek)Lepisma anophthalma Bilimek, 1867:905; Packard,1894:732; Silvestri, 1912:204; Wolf, 1934-1938:vol. 2 :484, vol. 3: 143; Jeannel, 1943: 144; Vandel,1964:205; Vandel, 1965a:171.Lepisma anophthalmum: Packard, 1888:88 (erroneousspelling).Lepisma cacahuamilpensis: Herrera, 1891:219, pI. II(fig. 1b); Packard, 1894:732.Lepisma anopthalma: MacGillivray, 1891:270 (erroneousspelling).Lepisma (?) anophtlalma: Silvestri, 1912:221 (erroneousspelling).Nicoletia anophthalma: Escherich, 1904:133, 140,155.Nicoletia: Bolivar, 1940:126.Nicoletia (Anelpistina) anophtalma: Wygodzinsky,1946:15-17, 19, 20, 21, fig. 1-2 (erroneous spelling).Nicoletia (Anelpistina) anophthalma: Paclt, 1963:47.Anelpistina: Wygodzinsky, 1967:519,523.Anelpistina anophthalma: Reddell, 1971b:48.Type-Iocality.-Of Lepisma anophthalma: Hohle(=Grutas de) Cacahuamilpa in Mexiko; of Lepismacacahuamilpensis: Caverna (=Grutas) de Cacahuamilpa,Guerrero, Mexico.Distribution.-Known only from the type-locality.See Fig. 68.Discussion.-This species is a member of a genusranging from southern Mexico into the southern UnitedStates, with one species in Peru (Wygodzinsky,1967). A closely related species, A. boneti (Wygodzinsky),is a troglophile in Grutas de Juxtlahuaca,Guerrero. Anelpistina is a frequent inhabitant ofcaves in Mexico, as both troglophiles and troglobites,but most of the species remain undescribed.Order EphemeropteraFamity BaetidaeThis family is represented in Mexican caves onlyby an unidentified genus and species collected inGrutas de Olivares, Puebla.Family LeptophlebiidaeTwo species of this family have been collected inMexican caves. Choroterpes (Neochoroterpes) mexicanusAllen was taken in Cueva de la Puente, San LuisPotosi (Allen, 1974). Nymphs of Thraulodes litotesAllen were found in a stream in total darkness inCueva del Brinco, TamauJipas. Both of these speciesare certainly troglophiles.Order OdonataEighteen species of dragonflies and damselflieswere reported from cenotes in Yucatan (Williamson,204