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1974:366; Vomero, 1974:353; Peck, 1977b:81,82.Type-Iocality.-Cueva de la Perra (=Capilla), LaPerra (=El Porvenir), 15 miles northwest of GomezFarias, Tamaulipas, Mexico.Distribution.-Known from four caves in the Sierrade Guatemala, Tamaulipas. See Fig. 8l.Records.-Tamaulipas: Cueva de la Capilla, Cuevade la Mina, Cueva de las Perlas, and Cueva Chica de laPerra.Discussion.-This species has greatly reduced eyesand very elongated antennal segments. It is a memberof the cavernicola group and is the most highly caveadaptedmember of the group. It was found on flowstoneand silt in association with Mexaphaenops intermediusin Cueva de la Capilla. Peck (1968) has discussedthe evolution of this species. Sbordoni andCobolli-Sbordoni (1973a) have considered the morphologicaldifferences between this "temperate" speciesand a typical "tropical" troglophilic species, P.GUATEMALA\r,...'...;/,./r'Fig. 81.-Distribution of troglobitic and troglophilic leiodid beetles of the genusPtomaphagus: 1,Ptomaphagw (Adelops)cavernicola cavernicola; 2, P. (A.) leo; 3, P. (A.) cavernicola aditus; 4, P. (A.) gypsum; S,P. (A.) mckenziei; 6,P. (A.) troglamexicanus;7, P. (A.) elabra; 8, P. (A.) spelaeus; 9, P. (A.) reddelli; 10, P. (A.) tabascemu; 11, P. (A.) barbarae; 12, P. (A.)giaquintoi.229