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FAMILY NEOBISIIDAE CHAMBERLINGenus Microbisium ChamberlinMicrobisium Chamberlin, 1930:20; Nelson, 1984:341.This genus is represented in North America by 2litter-dwelling species, Microbisium brunneium(Hagen) and M. parvulum (Banks). The latter iswidespread through the United States and is occasionallyfound in caves.Microbisium parvulum (Banks)Obisium parvulum Banks, 1895: 12.Microbisium parvulum: Chamberlin, 1930:21; Hoff,1946:495; Hoff, 1956b:3; Hoff, 1958:9; Nelson,1984:341.Microbisium confusum Hoff, 1946:496; Hoff,1958:9; Nelson, 1975:280.Microbisium sp.: Reddell, 1970:403.This species is apparently distributed widely overNorth and Central America (Nelson, 1984), usuallybeing found in moist ground litter. Occasionalspecimens have been found in Texas and 4specimens are here reported from caves: 2 femalesfrom Mold Hole, Travis County, 8 June 1966 (J.Reddell); 1 female from Copperhead Cave, San SabaCounty, 12 June 1978 (J. Reddell and R. Fieseler);and 1 female from the entrance sink of RobberBaron Cave, San Antonio, Bexar County, 21February 1986 (S.J. Harden).Genus Tartarocreagris CurcicTartarocreagris Curcic, 1984: 163.The genus is based on the species Microcreagrisillfernalis Muchmore, 1969, which is known onlyfrom a single female specimen. With the addition of3 more species, our understanding of the genus isincreased.Diagnosis (revised).-A genus of the familyNeobisiidae Chamberlin (1930:9). Carapace longerthan broad; with epistome small to absent; eyes 4 orabsent; chaetotaxy 20-30, with 4 at anterior and 4-6at posterior margin. Palpal coxa with 3-4(occasionally 5) apical setae. Middle tergites with12-15 setae; middle sternites with 15-17 setae(including 2 discal setae on sternites 6-8). Femaleanterior operculum with 3-4 small setae on each sideof midline; posterior operculum with marginal rowof 12-15, few sometimes displaced anteriorly nearmiddle. Male anterior operculum with about 24 scatteredsetae; posterior operculum with 6-12 on faceand 12-15 in marginal row. Internal genitalia ofmale with conspicuous round ventral sac, 2 smallerdorsal sacs, and 2 long, narrow, wrinkled lateralsacs. Cheliceral hand with 6-7 setae; flagellum of 8serrate setae; galea bifurcate distad of middle, eachramus with 0-2 spinules, smaller in male than infemale. Palp with small granulations on medial sidesof trochanter, femur, and chelal hand, andoccasionally on tibia; chelal fingers with numerouscontiguous marginal teeth, the distalmost 10-20 withcusps, the others rounded. Fixed finger of chelawith trichobothria et, it and est in distal half and ist,isb, and ib in proximal half; esb and eb placedlaterally on distal part of hand. Subterminal tarsalsetae of legs with spine near middle and fewspinules near tip (not "furcate," as stated by Curcic,1984: 164).Distribution.-As presently understood, the genusTartarocreagris is represented only by troglobiticforms in Williamson and Travis Counties, Texas.Tartarocreagris illfernalis (Muchmore)Microcreagris illfernalis Muchmore, 1969:15, fig.12.Microcreagris. spp. (in part): Reddell, 1970:403.Tartarocreagris infernalis (Muchmore): Curcic,1984:163, figs. 21, 40.The holotype female of this species was collectedfrom under a rock, several thousand feet from entrance,in Core Hole Cave (Inner Space Cavern)near Georgetown, Williamson County, Texas. Noother representative is known.Microcreagris infernalis was designated the typespecies of the new genus Tartarocreagris by Curcic(1984).Tartarocreagris texalla (Muchmore),NEW COMBINATIONFigs. 3,4Microcreagris texana Muchmore, 1969: 18, figs. 13,14; Chambers and Jahrsdoerfer, 1988:36029.Microcreagris. spp. (in part): Reddell, 1970:403.Australillocreagris texalla (Muchmore): Curcic,1989:360, figs. 8, 15.This species was described from the female holotypecollected in Tooth Cave, Travis County, Texas.131