. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. North American Ptomaphagus • Peck 131 OATEt**'-*'. m 19 Map 19. Distribution of Ptomaphagus troglomexicanus (circles with stars) and P. elabra (solid black spots) in north- eastern Mexico. 1 Cueva Capilla de la Perra and Cueva Chica de la Perra, 2 Cueva de la Mina, 3 El Sotano de Gomez Farias, 4 La Cueva del Nacimiento del Rio Frio, 5 El Sotano de las Abejas, 6 La Cueva del Puente, 7 Grutos de Quintero, 8 La Cueva de la Florida, 9 La Cueva de El Pachon, 10 Ventana Jabali (Cave), 11 El Sotano del Tlgre, 12 La Cueva de
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. North American Ptomaphagus • Peck 131 OATEt**'-*'. m 19 Map 19. Distribution of Ptomaphagus troglomexicanus (circles with stars) and P. elabra (solid black spots) in north- eastern Mexico. 1 Cueva Capilla de la Perra and Cueva Chica de la Perra, 2 Cueva de la Mina, 3 El Sotano de Gomez Farias, 4 La Cueva del Nacimiento del Rio Frio, 5 El Sotano de las Abejas, 6 La Cueva del Puente, 7 Grutos de Quintero, 8 La Cueva de la Florida, 9 La Cueva de El Pachon, 10 Ventana Jabali (Cave), 11 El Sotano del Tlgre, 12 La Cueva de los Sabinos, 13 El Sotano de la Tinaja, 14 El Sotanito de Montecillos and el Sotano de Pichijumo, 15 La Cueva de Valdoso, 16 Las Cuevas de Taninul, 17 La Cueva Chica, 18 Cueva de Puente de Dios. Copied in part from privately distributed base map of William H. Russell and Robert W. Mitchell, 1969, and maps in Reddell and Mitchell 1971a, 1971b. Distribution and evolution. The species is known only from the above collections made in middle and high elevation temperate forests in the Sierra Madre de Oaxaca. This species is probably similar to the ancestor from which cavernicola and its derivatives arose. Ptomaphagus elabra Peck Figures 62, 63, 128, 196, 211; Maps 13, 19 Ptomaphagus elabra Peck, 1971b: 9. Holotype male and allotype female in MCZ (no. 31895). Type locality: Mexico, Tamaulipas, Cueva de El Pachon, 16 km SSW Ciudad Mante. Diagnosis. The species is known only from caves at low elevations in the states of Tamaulipas and San Luis Potosi. Its large eyes, short antennae, relatively short and thick aedeagus, and shape of the spermatheca serve to characterize it. Description. Length mm. Width mm. Color dark brown. Head finely punctured. Eyes normal, their diameter times the distance from their anterior margin to antennal base. An- tennae (Fig. 128) short, stout, flattened; not reaching pronotal base when laid back; club darker; segments gradually increas
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