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Ptomaphagus (Adelops) is a group of beetles representedin this region by eight troglophilic and threetroglobitic species. Peck (1973a, 1977a) has placedthe Mexican and Central American cavernicoles intotwo species groups. The consobrinus group rangesfrom the southern United States into Central America.Three cave inhabiting species from southernMexico, Belize, and Guatemala belong to this group:P. (A.) reddelli Peck from caves in the Valle Nacionaland Acatlan regions of Oaxaca; and P. (A.) barbaraePeck from caves in Belize and possibly in EI Peten,Guatemala, are troglophiles. Ptomaphagus (A.) giaquintoiJeannel from three caves in Alta Verapaz,Guatemala, is a probable troglobite. The remainingnine species all belong to the cavernicola group. Thisgroup ranges from the United States into Guatemala.Ptomaphagus (A.) cavernicola cavernicola Schwarz isa common troglophile in the United States; in Mexicoit is known only from Grutas del Palmito, NuevoLeon, where it is abundant on human feces throughoutthis heavily polluted cave. Ptomaphagus (A.)cavernicola aditus Peck is known only from Cueva dela Boca, Nuevo Leon; P. (A.) gypsum Peck, describedfrom Resumidero del Pablillo, Nuevo Leon, and originallythought to be a troglobite (Peck, 1973a), hasrecently been found in nearby epigean localities(peck, 1977a); P. (A.) elabra Peck is known frommany caves in the Sierra de EI Abra and lowlandSierra de Guatemala; P. (A.) leo Peck has been foundin caves in Nuevo Leon and Queretaro; P. (A.) spelaeus(Bilimek) is known from caves in Guerrero andMexico, as well as nearby epigean localities; P. (A.)tabascensis, described by Sbordoni (1974) fromGrutas del Cocona, Tabasco, has been collected alsoin caves in Campeche, Quintana Roo, and Yucatan,and from forested habitats in Campeche. The remainingtwo species of the cavernicola group, P. (A.)mckenziei and P. (A.) troglomexicanus, are troglobitesand discussed below. Sbordoni et al. (1977)reported undetermined troglophilic and troglobiticspecies ofPtomaphagus from several caves in Chiapas.See Fig. 81 for localities from which cavernicolePtomaphagus (Adelops) are known.Ptomaphagus (A delops) giaquintoi JeannelPtomaphagus (Adelops) giaquintoi Jeannel, 1936:93;Jeannel, 1949:98-99; Nicholas, 1962:180; Nicholas,1968:168.Ptomaphagus giaquintoi: Barr, 1973:276; Peck,1973a:l00, 101; Peck, 1973c:38, 40, 42, 43, 44,45, 61, 85, 86, 92, 93, 94, 95, 98, 99, 102, 103,104, 105, 111-112, 146, 147, 154, fig. 49, 93,123, 175,204;Strinati, 1977:387.Ptomaphagus: Peck and Peck, 1973:70.Type-Iocality.-Cueva Sepacuite (=Cueva Sepacuiten. 2), near Panzos, Alta Verapaz, Guatemala.Distribution.-Known from three caves in AltaVerapaz, Guatemala. See Fig. 81.Records.-GUATEMALA: Alta Verapaz: Grutasde Lanquin, Cueva de Seamay, and Cueva Sepacuiten.2.Discussion.-This species is the only troglobiticleiodid known from Guatemala. Its ecological statusis uncertain since it still retains functional flight wingsand pigmented eyes. The fact that the eyes are reduced,the body is depigmented, and the appendagesare elongated suggests that it is now restricted to thecave habitat (Peck, 1973a). The beetles have beenfound in association with the guano of insectivorousbats.Ptomaphagus (Adelops) mckenziei PeckPtomaphagus (Adelops) mckenziei Peck, 1977a:196,199,200,205,212, fi~48-59, 112.Type-Iocality.-Cueva de California, 4 mi. NERancho Nuevo, 46 road miles SW of EI Barretal (inTamps.), Nuevo Leon (=Tamaulipas), Mexico.Distribution.-Known only from two caves in thePurificacion region, Tamaulipas. See Fig. 81.Records.-Tamaulipas: Cueva del Brinco andCueva de California.Discussion.-This species possesses reduced and depigmentedeyes, elongated antennae, and reducedflight wings. It is very closely related to P. (A.) cavernicola,from which it may be directly descended(peck, 1977a). The cavernicola group includes, inaddition to the two troglobites listed here, a thirdform which shows some adaptations to the cave environment:P. (A.) cavernicola aditus from Cueva dela Boca, Nuevo Leon.Ptomaphagus (Adelops) troglomexicanus PeckPtomaphagus (Adelops) troglomexicanus Peck, 1968:92-97, fig. 1-5; Reddell, 1971b:63; Reddell andMitchell, 1971b:194, fig. 21; Reddell, 1973a:41;Reddell and Elliott, 1973b:182, 187; Peck, 1977a:193, 199,206, 207,212, fig. 19,58, 130.Ptomaphagus troglomexicanus: Peck, 1971b: 12;Sbordoni and Argano, 1972:8; Vigna Taglianti,1972:125; Mitchell and Kawakatsu, 1973a:671,673; Peck, 1973a:l03, fig. 1, 12; Peck, 1973c:38,40, 42, 44, 45, 60, Ill, 128, 129-130, 154, fig.60, 131, 190; Reddell, 1973a:36; Sbordoni andCobolli-Sbordoni, 1973a:340-346, fig. 1; Sbordoniand Cobolli-Sbordoni, 1973b:150; Sbordoni,228