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1977:80, 82, fig. 1 (part-Cueva Piedra Ancharecord only).Agastoschizomus n.sp.: Reddell, 1981:26, 124-125,fig. 21 (part).Material examined.-MEXICO: Hidalgo:Cueva Piedra Ancha, 19 Aug. 1965 (J. Reddell, J.Fish, W. Bell), 1 immature (TMM). San Luis PotOSI:Cueva de San Pedro, 4 Ian N of Tlamaya, 900m elev., 28 Dec. 1984 (P. Sprouse), 1 immature(TMM); S6tano de Tlamaya, Tlamaya, 650 m elev.,24 Dec. 1984 (P. Sprouse), 1 immature (TMM).Comments.-The specimen from Cueva PiedraAncha may belong to A. styg;us. Material fromCueva de San Pedro and S6tano de Tlamaya maybelong to A. huitzmolotitlensis. All of these records,however, are based on specimens too immature forpositive placement.Undetermined genus and speciesFig. 3Protoschizomidae: Elliott, 1984a: 15; Elliott,1984b:8.Schizomid: Elliott, 1984a: 15; Elliott, 1984b:8; Elliottand Reddell, 1985:212.Undetermined genus and species (troglobite): Elliottand Reddell, 1985:214.?Agastoschizomus n. sp.: Reddell, 1985:5.Material examined.-U.S.A.: Texas: Val VerdeCounty: Seminole Sink: [=Seminole Canyon Cave),Seminole Canyon State Historical Park, 27 May1984 (W. Elliott, L. Bement), entrance talus cone, 1immature (TMM).Comments.- This specimen measures 1.90 mmlong (including the flagellum). It is apparently anearly instar, but clearly a member of the Protoschizomidae.Generic placement is not possible withoutadult material. This is certainly a relict populationnow isolated in a cave in Texas. The only otherTexas schizomid is Stenochrus mulaiki (Gertsch)from the Rio Grande Valley. Seminole Sink: is animportant archeological site and the specimen wascollected from the underside of a small rock deeplyburied in the talus cone beneath the 10 m deep entrancesink. The cone was completely excavatedduring the archeological excavations in the cave buthas since been replaced. Attempts to rediscover thespecies shortly after completion of the archeologicalstudy were unsuccessful, probably because the rockshad not yet had time to settle. The cave is in a statepark and protected by a gate and by a policy of admittanceonly for scientific research. Hopefully itwill be possible to find additional specimens andproperly place this significant species. This cavealso harbors a tropical relict amblypygid, Phrynus n.sp.ACKNOWLEDGMENTSWe are especially grateful to Dale Pate, PeterSprouse, and Terri Treacy for making extra effortsto collect in the caves of the Purificaci6n region. Wealso thank the following for providing us with material:William R. Elliott, Patty Mothes Jameson,Roy Jameson, H. Lynn McCutchen, CarmenSoileau, Ned Strenth, and Peter Strickland. The loanof material by Norman 1. Platnick (American Museumof Natural History) and by Wojciech 1. Pulawski(California Academy of Sciences) is deeply appreciated.We are grateful to Mark S. Harvey(Western Australian Museum) for allowing us to examinehis unpublished manuscript on scbizomids ofAustralia. The first author was supported in part byTexas Tech University (Depts. of Biological Sciencesand Entomology), for which he is grateful.Jeffrey W. Shultz (University of Cincinnati) kindlyread an early draft of the section on phylogeny andoffered many useful comments. Norman 1. Platnickis thanked for his initial cladistic analysis usingHennig86 and for his encouragement that we learnto use Hennig86. Further reviews and useful commentscame from Charles D. Dondale(Biosystematics Research Center, Ottawa), Norman1. Platnick (American Museum of Natural History),W. David Sissom (Elon College), and Darrell Ubick(California Academy of Sciences). Their assistanceis greatly appreciated.LITERATURE CITEDAnonymous. 1982. Schizomid. The New Encyclopaedia Britannica.Chicago: The Encyclopaedia Britannica Co. 15th ed.,Micropaedia,8:961.Alberti, G., and J.G. Palacios-Vargas. 1987. Fine structure ofspermatozoa and spermatogenesis of Schizomus palaciosiReddell and Cokendolpher, 1986 (Arachnida: Uropygi, Schizomida).Protoplasma, 137:1-14.Bittinger, S. 1975. Sotano Hondo de Pinalito. Assoc. MexicanCave Stud. Activities Newsl., no. 3:13-14.Briggs, T.S., and K. Hom. 1972. A cavernicolous whip-scorpionfrom the northern Mojave Desert, California (Schizomida:Schizomidae). Occas. Papers California Acad. Sci., no.98, 7 pp.Brignoli, P.M. 1973. Note sulla morfologia dei genitali degliSchizomidi e diagnosi preliminari di due nuove specie delMessico (Arachnida, Schizomida). Frag. Entomol., 9:1-9.Brignoli, P.M. 1974. A contribution to the knowledge of theSchizomida of Mexico and Guatemala (Arachnida, Schizomida).Accad. Naz. Lincei, Probl. Att. Sci. Cult., Quad.,171(2):143-152.72