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Description.-Length 2.20. Males with antennaltubercles on head close, forming a broad tubercleconstricted at base, vertexal foveae a distance of oneocular facet from eyes, eyes with about eight largefacets, maxillary palpi with last three segments elongate,together nearly as long as antennae, penultimatesegment angulate near base on mesal margin.Pronotum lacking any sulci, with small medianand lateral antebasal foveae. Elytra with two basalfoveae, lacking subhumeral fovea. Metastemumwith short longitudinal carina extending anteriorlyfrom near inner margins of each metacoxa; stemitesII-VI broadly flattened at middle; protrochanterswith prominent spine, metatrochanters with elongatebroad flange extending ventrally.Females are unknown.Male specimen from Gorman Cave, Texas: antenna1.19, metafemur 0.76, metatibia 0.79, metatarsus,0.47.Specimen examined.-Texas: San Saba County,Gorman Cave, 6 mi. SE Bend on Colorado River,III-15-1963, J. R. Reddell (DSC).Comments.-Cylindrarctus bicornis was takenfrom washed-in organic debris in total darkness severalhundred meters from the cave entrance (JamesR. Reddell, pers. carom.). This is the second knownspecimen of this species. The other specimen, theholotype, was produced by Belfrage from "Texas,"where he had collected most extensively at Cliftonand Norse in Bosque County. The other members ofthe genus are most commonly encountered in moistlitter near water, and bicornis will probably only befound in caves at their entrances since it lacks anyobvious cave adapted features. Cylindrarctus bicornisis readily separated from the other cave pselaphidsby the elongate last three segments of themaxillary palpi that together are nearly equal to theantennae in length.10. Tmesiphorus costalis LeConte(Fig. 21)Tmesiphorus costalis LeConte, 1849:77. Type locality:Pennsylvania. Holotype male (MCZC).Description.-Length 3.08-3.52. Males withhead and pronotum coarsely punctate, antennomereIX cylindrical and three times length of VIII, withlongitudinal groove on outer face, X slightly shorterthan IX and flattened ventrally with anterodistal angletuberculate, XI excavate in basal third on ventralsurface; maxillary palpi with apical segment triangular,previous two segments with lateral spine.Pronotal disc rounded; elytra with two basal foveae,lacking subhumeral fovea; abdomen with sternitesII-III lightly flattened at middle.Females with apical antennomeres narrower,lacking modifications; abdominal sternites broadlyrounded.Male specimen from Puberty Pit, Texas: antennae1.68, metafemora 1.04, metatibiae 1.20, metatarsi0.48.Specimens examined.-TEXAS: Burnet County:Simon Says Sink, XI-12-1990, J. Reddell, M.Reyes, berlese litter (2, TMMC); Snake Pit Sink,XI-20-1990, J. Reddell, M. Reyes, underside ofrock loosely buried in silt (2, DSC); SimonsSquirm-Around Cave, XI-20-1990, J. Reddell, M.Reyes, underside of rocks loosely buried in silt (4,DSC); Shin Oak Sink, 1-17-1991, J. Reddell, M.Reyes (4" DSC). San Saba County: Puberty Pit,IV-21-1990, D. Allen, W. Elliott, B. Fralia (1,TMMC). Travis County: Big Oak Cave, X-17-1990,J. Reddell, M. Reyes, on underside of rock indarkness (I, TMMC); Twin Dig Pit, XII-1l-1990,J. Reddell, berlese rodent nests at lowest point ofcave in total darkness (1, TMMC).Comments.-This species has been collected invarious leaf litters, under bark, with the antAphaenogaster fulva Roger (Park, 1933), and onespecimen has been found in a cave (Park, 1960).Tmesiphorus costalis and the other Nearctic speciesin the genus, carinatus (Say), are easily recognizedby the form of the maxillary palpi, and the coarselypunctate head and pronotum. Tmesiphorus costalis islarger than carinatus, the latter being easily distinguishedfrom costalis by a median longitudinalcarina on the first visible abdominal tergite.11. Hamotus (Hamotoides) electrae Park(Figs. 22-23)Hamotus electrae Park, 1942:327. Type locality:San Juan, Veracruz, MEXICO. Holotype male(FMNH).Description.-Length 3.20-3.40. Males with antennomeresIV-VIII transverse, IX twice as long asVIII, IX slightly shorter than X, both IX and Xslightly longer than wide; last segment of maxillarypalpus enlarged, twice as long as wide, with longitudinalsulcus on mesal margin.Pronotum with distinct transverse antebasal sulcus,width about half that of median antebasal fovea;elytra with two basal foveae, lacking subhumeral fovea;protrochanters carinate ventrally, a few specimenswith small denticle on carina, profemora with250