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setae, and ten ventral setae. Stemites V-VIII withtwo distinct rows of setae, one row along posteriormargins and one row near middle of stemites, IXwith anterior row irregular. Stemite VI about 3.6times as wide as long; width/length ratio versusbody length, \.7. Flagellum (Figs. 28-29, 59-61)0.62 rnm long, 0.34 mm wide; widest near middlewith pointed apex and pair of lightly sclerotizedventrolateral lobes projecting posterolaterally fromnear apex; dm2 seta missing.Pedipalps (Fig. 62): Trochanter slightly produceddistally. Patella with three spinose setae onventrolateral surface. Tibia with five spinose setaeon right pedipalp and four spinose setae on leftpedipalp (which increase in length and widthdistally) on ventrolateral margin. Spur about 0.5 andclaw about equal to dorsal length ofbasitarsus-tarsus.Chelicerae: Serrula with eight rounded teeth.Setae: 1=3; 2=3; 3=10; 4=2; 5=0; 6=1. Setae1-3 pilose; 4, 6 pointed.Legs: Leg I, including coxa, about 10.30 mmlong; basitarsal-tarsal segment proportions:17:6:6:7:7:6:22. Femur IV about 4.5 times as longas deep.Female paratype: As in male except as follows:Length from distal margin of propeltidium to baseof flagellum, 8.26 mm. Color reddish orange.Propeltidium 2.26 mm long, 1.10 mm wide. TergiteIV with one pair dorsal setae; tergite VIII with onepair dorsal, one pair dorsolateral, and one pairlateral setae near posterior margin and one pairdorsolateral setae near middle. Setation of segmentsX-XII also varies slightly. Stemites V-IX with twodistinct submarginal rows of setae. Stemite VI about3.6 times as wide as long; length/width ratio versusbody length, 2.3. Flagellum (Figs. 8-9, 63) 0.88mm long; dm2 and dm4 setae IDJssmg;segments/articles I, III-V present. Spermathecae(Figs. 64-65) of one pair of curved elongate lobesonly slightly enlarged apically. Chelicerae serrulawith eight rounded teeth; setae: 1=3; 2=7; 3 = 16;4 = 2; 5 = 0; 6 = 1. All setae except 6 long andpilose. Pedipalp equal in length to male pedipalp.Leg I, including coxa, 10.98 mm long;basitarsal-tarsal proportions: 20:7:7:7:8:7:22.Femur IV about 3.8 times as long as deep.Variation: An examination of four additionaladults revealed the following differences from theholotype: two specimens had only one dorsolateralseta on tergite IV; two specimens had one pairdorsal and one pair lateral setae; one specimen hadone pair dorsal, one pair dorsolateral, and one pairlateral setae on tergite VIII; one specimen had onepair dorsal, one pair dorsolateral, and one pairlateral setae on tergite IX. One specimen had sevensetae and one had five setae on the anterior sternum.One specimen had six and one had four spinose setaeon the pedipalp tibia. The flagellum of two juvenilesconsisted of two segments and was enlarged basally(annuli at positions 4 and 5). Because of thereduction in segmentation and enlargement, wepresume them to be penultimate males. Earlier instarjuveniles (presumably of both sexes) have nosegments in the flagellum. The setation of thejuvenile males is the same as the female except dm4is present.Measurements (mm).-Male holotype (femaleparatype): Pedipalp trochanter 0.22 (0.36); femur1.00 (1.30); patella 0.88 (1.18); tibia 0.88 (1.20);basitarsus-tarsus 0.40 (0.56); total 3.38 (4.60). LegI: trochanter 0.74 (0.76); femur 2.24 (2.56); patella2.90 (2.88); tibia 2.20 (2.24); basitarsus 0.38(0.40); tarsus 1.10 (1.20); total 9.56 (10.04). LegII: trochanter 0.54 (0.44); femur 1.70 (2.04); patella0.88 (\.12); tibia 1.20 (\.38); basitarsus 0.84(0.98); tarsus 0.78 (0.82); total 5.94 (6.78). LegIII: trochanter 0.44 (0.40); femur 1.64 (1.98);patella 0.86 (1.04); tibia 0.98 (1.20); basitarsus0.96 (1.12); tarsus 0.82 (0.88); total 5.70 (6.62).Leg IV: trochanter 1.00 (1.10); femur 2.26 (2.30);patella \.06 (1.26); tibia \.48 (1.90); basitarsus1.28 (1.46); tarsus 0.82 (0.98); total 7.90 (9.00).Habitat.-This species is relatively abundant inCueva del Tecolote. The cave is, with the exceptionof the Sistema Purificaci6n, the most extensive inthe Purificaci6n region. More than 11 kilometers ofpassage have been surveyed in the cave and it is inexcess of 230 m deep. During the rainy season thecave receives an enormous amount of floodwaterand is heavily polluted by sewage from the town ofLos San Pedro (Sprouse et aI., 1987).Protoschizomus purificacion new speciesFigs. 2-3, 12-13,30-31,72-77Material examined.-MEXICO: Tamaulipas:Cueva X, Conrado Castillo, 1,950 m elev., 27 Dec.1986 (P. Sprouse), female holotype (AMNH); 15April 1980 (D. Pate), immature male paratype(TMM).Etymology.-The species name is based on thePurificaci6n region in which area Cueva X islocated; it is used as a noun in apposition.Diagnosis.-Protoschizomus purificacion is distinguishedfrom all other species of Protoschizomusby the segmentation of the female flagellum, wheresegments/articles I and III-IV are present.57