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mutilated and has important parts missing or broken.From the data available it seems close to C.welboumi, with which it may be conspecific.However, a fmal determination will have to awaitcollection and study of additional material.Lower Sloth Cave also supports a population ofArcheolarca guadalupensis (see below).FAMILY GARYPIDAE HANSENGenus Archeolarca Hoff and ClawsonArcheolarca Hoff and Clawson, 1952:2.Five species of Archeolarca are known, all frompack rat nests and/or caves in Utah, Oregon, California,Arizona, New Mexico and Texas.Archeolarca guadalupensis MuchmoreArcheolarca guadalupensis Muchmore, 1981:54,figs. 9, 10.The 7 types (2 males, 2 females, 2 tritonymphs,1 deutonymph) were collected in Lower Sloth Cave,Guadalupe Mountains National Park, CulbersonCounty, Texas. No other representative is known.Archeolarca, sp. indet.Three nymphs belonging to this genus were collectedby Berlese separation of bat guano in TruckettGuano Cave, Valencia County, New Mexico, 11September 1976, by W.C. Welbourn. It is impossibleto determine the specific identification of theseimmature specimens.FAMILY CHEIRlDIIDAE CHAMBERLINGenus Cheiridium MengeCheiridium Menge, 1855:36; Hoff, 1952: 188.Four species of Cheiridium are presently knownfrom the United States, as discussed below. All aretiny creatures, usually found in rather dry litter.Cheiridium reyesi, new speciesFigs. 14, 15Type-data.-Holotype female (WM7363.01001)from Cot Cave, Kinney County, Texas, 7 October1987 (M. Reyes); mounted on slide (FSCA).Diagnosis.-Similar to C. finnum Hoff (1952)from which it can be distinguished by its larger size(palpal chela 0.40 mm long vs. 0.33-0.36 mm) andmore slender appendages (palpal femur 4.25 timesas long as broad vs. 3.25-3.5 times).Description of female (male unknown).-Withthe general characters of the genus. All parts lightbrown. Carapace subtriangular, with a median transversefurrow and a shallow depression near posteriormargin; surface granulate anterior to transverse furrow,reticulate behind; 2 small, corneate eyes; setaeslender, curved, 4 at anterior and 8-10 at posteriormargin. Abdomen ovate; tergites divided. About 20slender curved setae on middle tergites. Chaetotaxyof sternites not observable.Chelicera about JA as long as carapace; setae onhand not discernible; flagellum of 4 setae; galealong, slender, with 2 or 3 small terminal rami.Palp rather slender (Fig. 14); femur 4.25, tibia2.65, and chela (without pedicel) 2.85 times as longas broad; hand (without pedicel) 1.55 times as longas deep; movable finger 1.05 times as long as hand.Surfaces heavily granulate, with many arcuate setaewith midlateral spinules. Trichobothria as usual inthe genus, fixed fmger with 7 and movable fingerwith 2; et just proximad of middle of fixed fmger,much closer to est than to finger tip (Fig. 15). Eachfinger with 8-10 small marginal teeth, conical orrounded distally, becoming flattened proximally.Legs rather slender; leg IV with entire femur 5.3and tibia 4.65 times as long as deep. Articulationbetween basifemur and telofemur of all legs faintlyvisible (as in Figs. 17 and 18).Measurements (mm).-Body length 1.04. Carapacelength 0.34, posterior breadth 0.41. Chelicera0.09 long. Palpal trochanter 0.16 by 0.085; femur0.32 by 0.075; tibia 0.25 by 0.095; chela (withoutpedicel) 0.40 by 0.14; hand (without pedicel) 0.20by 0.13; pedicel 0.03 long; movable finger 0.21long. Leg IV: entire femur 0.265 by 0.05; tibia 0.21by 0.045; tarsus 0.185 by 0.03.Etymology.- The new species is named for MarcelinoReyes who collected the type specimen.Remarks.-Until now, only 3 species ofCheiridium have been reported from the UnitedStates: C. finnum Hoff (1952), C. insperatum Hoffand Clawson (1952), and C. museorum (Leach) (seeMuchmore, 1972). Of these, C. museorum is animmigrant from Europe found in Massachusetts andis larger and has more slender palps than the newspecies. C. insperatum was described from Utah andhas subsequently been identified in California(unpublished); it is even larger and has even slendererpalps. Cheiridium finnum is recorded onlyfrom Illinois, but a specimen from a cave in138