. The biogeography of the herpetofauna of the subhumid forests of Middle America : (Isthmus of Tehuantepec to northwestern Costa Rica). Herpetology; Reptiles, Fossil. that dispersed into the emerging outer Yucatan Peninsula and evolved in association with the developing subhumid forests in the middle to late Pleistocene, or, in a few cases in humid pockets (, cenotes) within the forest. Lang (1989), after reviewing the geological history of Mesoamerica, also postulated a Yucatan-based origin for both Laemanctus species. Subsequently, stocks of L. ser- ratus were able to disperse up the eas
. The biogeography of the herpetofauna of the subhumid forests of Middle America : (Isthmus of Tehuantepec to northwestern Costa Rica). Herpetology; Reptiles, Fossil. that dispersed into the emerging outer Yucatan Peninsula and evolved in association with the developing subhumid forests in the middle to late Pleistocene, or, in a few cases in humid pockets (, cenotes) within the forest. Lang (1989), after reviewing the geological history of Mesoamerica, also postulated a Yucatan-based origin for both Laemanctus species. Subsequently, stocks of L. ser- ratus were able to disperse up the east coast of Mexico after having evolved on the outer Yucatan Peninsula. The more southern populations of this species (Central Depression of Chiapas, Sula Plain, and eastern Guatemala and Belize) could have developed in situ in the developing subhumid forests of these regions, or, could possibly reflect rather recent dispersal events. We are unable to find any evidence to support Lee's (1980:37) contention that the outer end of the Yucatan Peninsula ". . was once a more mesic environment than it is ; He suggested such because of "the presence of three mesic-adapted species isolated at the outer end of the peninsula, far to the north of their ; Two extant species {Bolitoglossa yucatana and Eleutherodactylus yucatanensis), as noted by Lee (1980), occur in cenotes and caves in the karst topography and the Holocene fossil form Lepidophyma arizeloglyphus belongs to a genus with extant cavemi- colous members. We suspect that these taxa evolved in association with these mesic pockets as they formed rather than within widespread mesic forests that retreated "with the onset of drier conditions . ." (Lee, 1980:37). 5. SOUTH AMERICAN GENERALIZED TRACK (6 species; Table 10; Fig. 7) The species in this track, or their ancestors, probably dis- persed from south to north through a now-vanished sub- humid corridor soon after the closure of the Panam
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