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than P. treacyae and may be a more recent caveimmigrant.The four species of Agastoschizomus are isolatedfrom each other. Agastoschizomus lucifer inhabitsthe Sierra de EI Abra, a low mountain range alongthe eastern slopes of the Sierra Madre Oriental. TheRio Tamuin cuts through the cavernous limestoneand thus isolates this species from A.huitzmolotitlensis which inhabits a higher elevationin the Sierra Madre Oriental near Xilitla. To thesouth of this region the Rio Moctezuma cuts throughthe cavernous limestone and thus isolates A.lOS'105'102'99'9S'30'30'27'27'24'24'İ:)•21'105'102'99'Fig. 3.-Distribution of Protoschizomidae. I, Genus and species undetermined (immature only); 2, PrOioschizomus purijicacion, P.rreacyae; 3, Agasroschizomus parei, P. sprousei; 4, P. genschi; 5, P. pachypalpus; 6, A. lucifer; 7, P. rowlandi; 8, A. huirzmolorirlensis;9, A. srygius; 10, P. occidenralis. Heavy outlines are rivers. G = RIO Guayalejo; M = RIO Moctezuma; T = RIO Tamuln.44