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citata Van Tyne in Cenote de Piste, Yucatan (Klaas,1968).Family PhilopteridaeThis family of lice is represented in Mexican cavesonly hy Philopterus excisus Nitzch from Petrochelidonfulva citata in Cenote de Piste, Yucatan (Klaas,1968).Order HemipteraThe order Hemiptera is represented in Mexicancaves hy 63 species in 25 families. Many of these speciesare known only from open·air cenotes in Yucatanor from entrance areas and will not be discussed here.Although troglobitic hemipterans are known fromcaves in Hawaii, no troglohitic species have heenfound in North or Central America. Several, however,are troglophiles, and at least one emesine reduviidshows some signs of hecoming adapted to cave existence.Suborder HydrocorizaeFamily BelostomatidaeHungerford (1936) reported two species of thegenus Belostoma and one of Lethocerus from openaircenotes in Yucatan. Abedus immensus Menke is atroglophile in Cueva de la Puente and Cueva de laLaguna, San Luis Potosi. Abedus signoreti Mayr isknown from Sotano del Molino, Tamaulipas; its ecologicalstatus is unknown. An undetermined speciesof the genus Belostoma is extremely ahundant inCueva del Azufre, Tabasco; numerous individualscarrying eggs were observed and it is certainly atroglophile. Belostoma subspinosum Beauvois isprobably a troglophile in Sotano del Lienzo, San LuisPotosI.Suborder AmphibicorizaeFamily GerridaeHungerford (1936) reported four species of gerridsfrom open-air cenotes in Yucatan. Two species havebeen collected from Mexican caves and are apparentlytroglophiles: Gerris remigis Say from Sotano de SanFrancisco n. 2, San Luis Potosi; and Trepobates pictus(Herrich-Schaeffer) from Cenote Poxil, Yucatan.An undetennined species of Trepobates was found inCenote Aka Chen, Quintana Roo.Family VeliidaeHungerford (1936) reported two species of Microveliafrom open-air cenotes in Yucatan. Numerous undetenninedspecies of this genus have been recentlycollected from many caves in Mexico. Rhagoveliavaripes Champion is a troglophile in caves in HidalgoTable 24.-Summary of cave inhabiting Hemiptera.TroglobitesOther SpeciesHydrocorizaeBelostomatidae 0 6Corixidae 0 1Gelastocoridae 0 1Naucoridae 0 2Nepidae 0 2Notonectidae 0 3Ochteridae 0 1AmphibicorizaeGerridae 0 5Hebridae 0 1Hydrometridae 0 1Mesoveliidae 0 1Veliidae 0 5GeocorizaeCeratocombidae 0 1Cimicidae 0 4Cydnidae 0 7Dipsocoridae 0 1Enicocephalidae 0 1Lygaeidae 0 5Miridae 0 2Pyrrhocoridae 0 3Reduviidae 0 6Rhopalidae 0 1Schizopteridae 0 1Thyreocoridae 0 1Tingidae 0 1Total 0 63and San Luis Potosi. Velia sp. is an apparent troglophilein Grutas del Mogote, Guerrero.Suborder GeocorizaeFamily CimicidaeFour species of bedbug of the family Cimicidaehave heen collected from Mexican caves. Cimexhemipterus Fahricius was reported hy Pearse (1938b)from caves in Yucatan. Hoffmann (1972) reportedCimex pilosellus (Horvath) from Cuevas del Cerro deXictle, Distrito Federal. The rare hat hedhug Primicimexcavernis Barher, has heen taken from Cueva deJanitzio, Michoacan, and Cueva de Valladolid, Yucatan(Ueshima, 1968). Primicimex cavernis and Cimexincrassatus Usinger and Ueshima are known from ahat cave at Chocoyos, Chimaltenango, Guatemala(Sailer, 1950; Usinger, 1966). Primicimex cavernis isotherwise known only from Ney Cave and Fern Cave,Texas (U.S.A.). This species lives in crevices in thewalls of the chamhers inhabited by bats and duringthe day emerges to feed on the resting bats.Family CydnidaeSeven species of the family Cydnidae have beenfound in Mexican caves (see Fig. 74). All are probably214