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ottom of entrance pit, Ogle Cave (Ogle Section),Carlsbad Caverns National Park, Eddy County,New Mexico, 2 September 1974 (yV.C. Welbourn);allotype female (WM3340.01001) found on dampflowstone in twilight, Ogle Cave (Rainbow Section),CCNP, Eddy County, New Mexico, 27 May 1973(yV.R. Elliott); all mounted on slides (FSCA).Diagnosis.-Much like Chitrella transversa(Banks) but larger (chela length 1.13-1.41 mmrather than 0.78-1.00 mm) and with more slenderappendages (chela lengthlbreadth 3.55-3.9 ratherthan 2.8-3.35).Description.-Male and female similar, but femaledistinctly larger. Carapace and palps lightbrown, other parts lighter. Carapace longer thanbroad; surface smooth; with 2 indistinct transversefurrows; 4 corneate eyes; about 30 setae, 6 at anteriorand 7-8 at posterior margin.Abdomen long, narrow. Tergal chaetotaxy ofholotype 7:10:11:14:13:14:15:15:15:11:7:2; otherssimilar. Sternal chaetotaxy of male like that ofC. transversa (see Muchmore, 1973:190); that ofholotype 14:[1-1 ]:(3)9114(4):(3)24(3):0/16: 17: 18:17:16:14:4:2; paratype similar but with 4 setae onall stigmatic plates; there is no sensory area onsternite 6; sternites 6-10 with 2 larger setae nearmiddle of row. Anterior sternal chaetotaxy of female7:(4)16(4):(4)12(4):-; sternites 6-10 with 2enlarged setae as in male.Chelicera 0.55-0.6 as long as carapace; hand with5 setae; flagellum apparently of 5 serrate setae; nospinneret visible.Palp rather slender (Fig. 8); femur 4.2 (male),5.05 (female), tibia 2.55-2.7 (male), 3.2 (female),and chela (without pedicel) 3.55-3.75 (male), 3.9(female) times as long as broad; hand (withoutpedicel) 1.55-1.6 (male), 1. 85 (female) times aslong as deep; movable finger 1.35 (male), 1.3(female) times as long as hand. Surfaces smoothexcept few small granules on medial sides of femur,tibia, and chelal hand. Trichobothria typical (Fig.9); t, on movable fmger, is flattened or lanceolatetoward distal end. Fixed fmger with 52-65 cuspedmarginal teeth; movable finger with 52-63 teeth, ofwhich only the distal 10-12 are cusped, the otherslower and rounded. Movable finger with a sensillumbetween trichobothria st and sb. In addition,movable finger with a low thickening of the dentalmargin (denticle?) lateral to proximal teeth (4thfrom proximal end of row in holotype, 6th inallotype) (Fig. 10); this structure not evident inparatype male.Legs rather slender; leg IV with entire femur3.25-3.4 and tibia 5.1- 6.0 times as long as deep. Along tactile seta on tibia and basitarsus of leg IV.Subterminal tarsal setae dentate.Measurements (mm).-Figures given first forholotype male, followed in parentheses by those forparatype male and allotype female. Body length 3.0(3.0-3.05). Carapace length 0.76 (0.79-0.82).Chelicera 0.41 (0.42-0.48) long. Palpal trochanter0.36 (0.35-0.49) by 0.19 (0.21-0.21); femur 0.75(0.76-0.96) by 0.18 (0.18-0.19); tibia 0.63(0.64-0.80) by 0.235 (0.25-0.25); chela (withoutpedicel) 1.13 (1.20-1.41) by 0.30 (0.34-0.36); hand(without pedicel) 0.50 (0.52-0.65) by 0.31(0.33-0.35); pedicel 0.07 (0.075-0.09) long; movablefinger 0.68 (0.69-0.83) long. Leg IV: entirefemur 0.69 (0.695-0.79) by 0.20 (0.215-0.23); tibia0.56 (0.585-0.72) by 0.11 (0.115-0.12).Etymology.-The species is named for W.C.Welboum, who has collected most of the pseudoscorpionmaterial known from caves in NewMexico.Remarks.-It is interesting to note that C.welbourni is similar to C. transversa in not having aspecialized sensory area on the 6th sternite of males.On the other hand, 9 specimens of C. transversaexamined fail to show the lateral thickening(denticle?) of the proximal dental margin as seen inC. welbourni.In C. welbourni (and the other species of Chitrellatreated below) there are 2 transverse furrowson the carapace, rather than one as seen in C. transversa;one (equivalent to that in C. transversa) is locatedjust posterior to the middle of the carapace,while the second is closer to the posterior margin.As Hoff pointed out (1956b:22), these "furrows"are noticeable more because of underlyingthickening of the cuticle than depression of thesurface.Chitrella major, new speciesFig. 11Type-data.- Holotype female (WM4571.01002)and 2 paratypes (1 female, 1 tritonymph) from FernCave, Val Verde County, Texas, 14 April 1973(T.R. Mollhagen); mounted on slides (FSCA).Diagnosis.-This is the largest known species ofChitrella in the United States (palpal chela > 1.4mm in length).Description of female (male unknown).-Carapaceand palps reddish brown, other parts tan. Carapacelonger than broad; surface smooth; with 2 distincttransverse furrows; 4 corneate eyes, posteriorpair smaller; 38-40 setae, with 7-9 at anterior and 8at posterior margin135