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and one pair setae at base of process; with one pairwidely spaced setae 5/11 from anterior margin andone pair closely spaced setae 3/11 from posteriormargin. Gap between mesopeltidial plates about 0.2anterior width of one plate. Metapeltidium dividedby narrow suture. Anterior sternum with nine setae,plus two sternapophysial setae. Posterior sternumwith three setae.Abdomen: Tergite I with two pairs anterior microsetae(in row) and one pair large posterior setae;tergite II with three pairs anterior microsetae (inrow) and one pair large posterior setae; tergitesIII-V with one pair dorsal setae each; tergite VI withone pair dorsal setae and one dorsolateral seta onright side; tergite VII with one pair dorsal and onepair dorsolateral setae; tergite VIII with one pairdorsal, one pair dorsolateral, and one pair lateral setae;tergite IX with one pair dorsal and one pair lateralsetae and one dorsolateral seta on left side.Segment X with one pair dorsal, one pair lateral,and four ventral setae; segment XI with one pairdorsolateral, one pair lateral, and six ventral setae;segment XII with one pair large dorsal, six smallerdorsal, and 10 ventral setae. Sternite VI about 2.4times as long as wide; width/length ratio versusbody length, 3.4. Sternites IV-IX with two distinctsubmarginal rows of setae. Flagellum (Figs. 32-33,82-84) 1.44 mrn long, 0.40 mrn wide, tubular withone pair short nonsclerotized retractable ventrolaterallobes; with complete set of setae.Pedipalps (Fig. 85): Trochanter not produced distally.Patella with three strong ventrolateral spinosesetae, increasing in length distally. Tibia with fivestrong ventrolateral spinose setae. Spur about 0.5,claw about 1.1 dorsal length of basitarsus-tarsus.Chelicerae: Serrula with eight teeth. Seta: 1=3;2=6; 3= 10; 4=2; 5=0; 6= 1.Legs: Leg I, including coxa, 14.82 mrn long;basitarsal-tarsal proportions: 31: 10:9:8: 11: 8:28.Femur IV about 5.3 times as long as deep.Female from Sotano de Yerbaniz: As in male exceptas follows. Length from distal edge of propeltidiumto base of flagellum, 12.40 mrn. Propeltidium3.02 mrn long, 1.46 mrn wide. Anteriorsternum with eight setae; posterior sternum withfour setae. Tergite VI with one pair dorsal setae andone dorsolateral seta on left side; tergite VIII withone extra dorsolateral seta on left side; tergite IXwith one pair dorsal, one pair lateral, and one pairsmall setae on lateral margins about midway alonglength of tergite. Sternite VI about 2.3 times as wideas long; width/length ratio versus body length, 5.4.Sternites V-IX with two distinct submarginal rowsof setae. Flagellum (Figs. 16-17, 86) 1.30 mrn long;dm2 seta missing; segments/articles I, III-V present.Sperrnathecae (Fig. 87) of one pair of gently curvedlobes with slightly enlarged apical bulb. Pedipalplength in proportion to body length about 0.9 malepedipalp length. Leg I, including coxa, 16.62 mrnlong; basitarsal-tarsal proportions: 33: 10: 10: 10:10: 10:30. Femur IV about 5.4 times as long asdeep.Variation: An examination of 12 adult or late instarspecimens reveals the following differencesfrom the holotype: Two specimens were found tohave only one pair of dorsal setae; a third specimenhad the anteriormost pair, but one seta was missingin the posteriormost pair. Three specimens had onlyone pair of setae on tergite VI. One specimen hadfour pairs of setae on tergite VIII, the extra pair beingvery small lateral setae distad to the posteriormargin; one specimen had one extra lateral seta distadto the posterior margin. One specimen had threepairs of setae on tergite IX, the extra pair being anteriorto the posterior margin and very small. Theanterior sternum included seven (one specimen),nine (one specimen), 10 (five specimens), and 11(five specimens) setae. One specimen had three setaeon the posterior sternum, seven specimens had foursetae, and four specimens had two setae. These variationscould not be correlated with sex, maturity/age,or locality.Measurements (mm).-Male holotype (female):Pedipalp: trochanter 0.34 (0.44); femur 1.42 (1.90);patella 1.30 (1.66); tibia 1.22 (1.78); basitarsustarsus0.72 (0.98); total 5.00 (6.76). Leg I:trochanter 0.70 (0.98); femur 3.64 (4.18); patella4.14 (4.54); tibia 3.38 (3.54); basitarsus 0.62(0.72); tarsus 1.50 (1.62); total 13.98 (15.58). LegII: trochanter 0.48 (0.68); femur 2.60 (3.08); patella1.40 (1.70); tibia 1.78 (2.00); basitarsus 1.30(1.56); tarsus 1.14 (1.38); total 8.70 (10.40). LegIII: trochanter 0.58 (0.82); femur 2.54 (2.86);patella 1.22 (1.44); tibia 1.70 (1.96); basitarsus1.48 (1.72); tarsus 1.22 (1.48); total 8.74 (10.28).Leg IV: trochanter 1.22 (1.64); femur 3.16 (3.78);patella 1.64 (1.82); tibia 2.68 (3.12); basitarsus1.82 (2.22); tarsus 1.34 (1.56); total 11.86 (14.14).Habitat.-The three caves from which thisspecies has been collected are located in the Sierrade EI Abra, a low mountain range extending fromsouth of Ciudad Valles north to Ciudad Mante. Allthree caves are extensive systems receiving massiveamounts of floodwater during the wet season(Mitchell et aI., 1977). Vegetation of the region ischaracterized as thorn forest. Specimens have beenfound actively roaming across silt banks in totaldarkness.65