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Cephalothorax: Propeltidium 1.66 mm long, 0.90mm wide; with one seta on apical process and onepair of setae at base of process; with one pair ofdorsal setae located about 1/3 from anterior marginof propeltidium. Gap between mesopeltidial platesabout 0.2 anterior width of one plate. Metapeltidiumundivided. Anterior sternum with 11 setae; posteriorsternum with one seta, poorly sclerotized, triangular.Abdomen: Tergite I with two pairs anterior microsetae(in row) and one pair large posterior dorsalsetae; tergite II with three pairs anterior microsetae(in row) and one pair large posterior dorsal setae;tergites III-IV with one pair dorsal setae each; tergitesV-VI with one pair dorsal and one pair dorsolateralsetae each; tergite VII with one pair dorsaland one pair dorsolateral setae and one lateral setaon right side; tergite VIII with six setae near posterioredge of tergite and one pair dorsal and one pairdorsolateral setae near middle of tergite; tergite IXwith one pair long dorsal and one pair short lateralsetae near posterior margin, and one pair small dorsolateralsetae near middle of tergite. Sternites IV­VIII with one row setae near middle of sternite andone row near posterior margin, IX with irregular anteriorrow. Sternite VI about 2.0 times as wide aslong; width/length ratio versus body length, 3.5.Segment X with one pair dorsolateral, one pair lateral,and row of six ventral setae. Segment XI withone pair lateral and row of seven ventral setae. SegmentXII with two very long posteriorly directeddorsal setae reaching about 2/3 length of flagellum,two shorter dorsolateral setae, and 11 ventral setae;longer than segments X-XI combined. Flagellum(Figs. 34-35, 88-90) 1.08 mm long, 0.26 mm wide;cylindrical, modified apically with pairs of retractableventrolateral lobes; vmS seta missing.Pedipalps (Fig. 91): Trochanter not produced distally.Patella with two strong ventrolateral spinosesetae, distalmost tapering to long pointed end. Tibiawith four strong ventrolateral spinose setae. Spurabout 0.5, claw about 1.2 times as long as dorsallength of basitarsus-tarsus.Chelicerae (Fig. la): Serrula with 7 teeth; setae:1=3; 2=1; 3=8; 4=2; 5=0; 6=1.Legs: Leg I, including coxa, about 10.94 mmlong; basitarsal-tarsal segment proportions:20:7:6:7:6:5:21. Femur IV (Fig. 92) about 4.8times as long as wide.Female unknown.Measurements (mm).-Male holotype: Pedipalp:trochanter 0.33; femur 1.02; patella 0.84; tibia0.96; basitarsus-tarsus 0.44; total 3.59. Leg I: trochanter0.56; femur 2.62; patella 3.06; tibia 2.48;basitarsus 0.46; tarsus 1.10; total 10.28. Leg II:trochanter 0.30; femur 2.22; patella 1.00; tibia1.28; basitarsus 0.90; tarsus 0.78; total 6.48. LegIII: trochanter 0.34; femur 2.20; patella 0.88; tibia1.26; basitarsus 1.08; tarsus 0.82; total 6.58. LegIV: trochanter 0.90; femur 2.32; patella 1.12; tibia1.90; basitarsus 1.40; tarsus 0.96; total 8.60.Habitat.-S6tano de Huitzmolotitla is an extensivecave which contains an active stream and receivesconsiderable floodwater during the wet season.The cave is 3,002 m long and 240 m deep(Russell and Raines, 1967). This species was collectedfrom the mud room near the back of the cave.Agastoschizomus stygius new speciesFigs. 2-3, 18-19,93-96Agastoschizomus sp.: Rowland and Reddell,1977:80, 82, fig. 1 (part-S6tano Hondo de Pinalitorecord only).Agastoschizomus n.sp.: Reddell, 1981:26, 124-125,fig. 21 (part).Material examined.-MEXICO: Hidalgo:S6tano Hondo de Pinalito, Pinalito (a village locatedat kilometer post 105 on highway 85 north ofJacala), 1,600 m elev., 1 Jan. 1976 (C. Soileau andP. Strickland), female holotype (AMNH), immatureparatype (TMM).Etymology.-The species name is from the Latinstygius, the lower world, referring to its cavernicolehabitat.Diagnosis.-The absence of the large posteriorsetae on abdominal tergite I separates this speciesfrom all other Agasroschizomus. The shape of thefemale spermathecae and femur IV length/width ratioalso distinguishes this species from other Agasroschizomus.This species also may be distinguishedfrom females of A. lucifer by possessing only segments/articlesIV and V in the female flagellum,rather than I and III-V. This species may be separatedfrom A. patei by the presence of segments/articlesin the female flagellum.Description.-Female holotype (length from distaledge of propeltidium to base of flagellum, 9.66mm). Abdomen and legs orangish brown; propeltidium,chelicerae, and pedipalps reddish brown.Cephalothorax: Propeltidium 2.50 mm long, 0.80mm wide; with one seta on anterior process and pairof setae at base of process and three dorsal setae(two close-set setae on right side, one seta on leftside). Gap between mesopeltidial plates about 0.3anterior width of one plate. Metapeltidium entire,with only a faint midline along the posterior margin67