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Typhlochactas elliotti MitchellTyphlochactas elliotti Mitchell, 1971b:135-148, fig.1-17, 26-27; Reddell and Mitchell, 1971a:144,fig. 1; Reddell, 1973a:33, 37; Reddell and Elliott,1973a:171; Gonzalez Sponga, 1974:56; Soleglad,1976:253,254; Mitchell and Peck, 1978:159, 164,167,168.Troglobitic scorpion: Elliott, 1972:130.Typhlochactas: Vomero, 1974:353 [Sotano de Jerbaniz(= Yer1aniz) record only]; Mitchell et al., 1977:56.Typlochactas (part): Diaz Najera, 1975:3,35 (erroneousspelling).Typlochactas elliotti: Diaz Najera, 1975 :4, 30 (erroneousspelling).Type-locality. -Sotano de Yer1aniz, located approximately21 km north of Ciudad Valles, San LuisPotosi, Mexico.Distribution.-Known only from the type-locality.See Fig. 17.Discussion.-This is the most highly cave adaptedof the three known troglobitic scorpions in the genus.It appears to have its closest affinities with T. rhodesiMitchell, the geographically nearest species (Mitchell,1971b). Mitchell expresses surprise at the discoveryof a highly evolved troglobite in the Sierra de EIAbra, but this is perhaps a logical development in theevolution of the troglobitic Typhlochactas. The recentdiscovery of the eyeless T. sylvestris Mitchelland Peck from forest litter at 1220 meters in Oaxacagives us an important clue to the evolution of thisgroup. It may be assumed that the ancestral blindscorpions originally in habited much of Mexico asinhabitants of deep forest litter. With the rise oftemperature in the lowland tropics following thecolder climate of the glacials, they survived in cavesat low elevations and the surface populations wereeliminated. The surface populations still existed inthe cooler forested highlands for longer periods oftime, but eventually they, too, became extinct, isolatingthe ancestors of T. rhodesi and T. reddelli incaves. The comparatively robust endogean populationscontinue to live in Oaxaca and probably elsewherein Mexico in moist, heavily forested highlandsituations. The distribution pattern of Typhlochactasis very similar to that of the millipeds of the Cleidogonacrucis group in Oaxaca and Veracruz, and isprobably duplicated by the distribution of the millipedsof the genus Mexiterpes in San Luis Potosi andQueretaro. Typhlochactas elliotti has been collectedfrom the pants leg of the original collector and frombare rock on the cave ceiling and walls.Typhlochactas reddelli MitchellTyphlochactas reddelli Mitchell, 1968:762-776, fig.22-41; Reddell, 1971a:217; Reddell, 1971b:26;Mitchell, 19711:135, 138, 143, 145-146, fig. 21­23, 25, 27; Muchmore, 1972a:275; Kawakatsu,1973b:255; Reddell, 1973a:32, 37; Vachon,1974:930,931,934, fig. 167,183,199-201; Soleglad,1976:253-254; Mitchell and Peck, 1978:159,162, 164, 167, 168.Typhlochactas reddeli: Gonzalez Sponga, 1974:56(erroneous spelling).Typhlochactas: Vomero, 1974:353 (Cueva del Ojo deAgua de Tlilapan record only).Typlochactas (part): Diaz Najera, 1975:3,35 (erroneousspelling).Typlochactas redelli: Diaz Najera, 1975:4, 33 (erroneousspelling).Type-Iocality.-Cueva del Ojo de Agua de Tlilapan,in the village of Tlilapan, Municipio de Tlilapan, approximatelyfive km sou th of Orizaba, Veracruz,Mexico.Distribution.-Known only from the type-locality.See Fig. 17.Discussion.-The single known specimen of thisspecies was collected from beneath a rock in the firstbat room of the cave.Typhlochactas rhodesi MitchellTyphlochactas rhodesi Mitchell, 1968:756-765,768­776, fig. 1-21, 41, pI.; Delamare Deboutteville,1971:49; Reddell, 1971b:3, 27, cover; Mitchell,1971b:135, 138, 143, 145-146, fig. 18-20,24,27;Reddell and Mitchell, 1971b:181, 184, fig. 9; Reddelland Mitchell, 1971d:foll. table of contents;Sbordoni and Argano, 1972:8; Mitchell and Kawakatsu,1973a:671; Reddell, 1973a:32, 37; Reddelland Elliott, 1973b:181; Gonzalez Sponga, 1974:56; Kawakatsu, 1976:35; Soleglad, 1976:253,254; Mitchell and Peck, 1978:159,164,165,167,168.Typhlochactas: Vomero, 1974:353 [Cueva Chica(=Cueva de la Mina) record only].Typlochactas (part): Diaz Najera, 1975:3, 35 (erroneousspelling).Typlochactas rhodesi: Diaz Jajera, 1975:4,32 (erroneousspelling).Type-Iocality.-La Cueva de la Mina, Sierra deGuatemala, Municipio de Gomez Farias, Tamaulipas,Mexico.Distribution.-Known only from the type-locality.See Fig. 17.Discussion.-This species is known only by a fewspecimens taken from a single small upper level roomin this cave.us