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small ventral carina near base, protibiae with smalltooth on mesal margin at point about two-thirds oflength, mesotrochanters vaguely carinate on ventralmargin, metasternum deeply and transversely impressedin apical two-thirds, posterior margin raisedas flanges at mesal margins of metacoxae; abdominalsternites II-VI widely impressed.Females lack modifications of legs and metasternum;abdominal sternites broadly rounded.Male specimen from Porcupine Cave, Texas: antennae1.44, metafemora 1.00, metatibiae 1.08,metatarsi 0.54.Specimens examined.-3: TEXAS: KinneyCounty, Porcupine Cave, X-17-1987, G. Veni, J.Ivy (DSC and TMMC). Five other specimens werecollected at Bentsen-Rio Grande St. Pk., VI-I0­1975, by Robert Turnbow at ultraviolet light (DSCand RHT).Comments.-This species was previously knownonly from the holotype male collected in Veracruz,Mexico (Park, 1942). It is apparently a free-livingspecies, and will probably only be found when associatedwith caves at their entrances. Park (1942)placed this species in Group XII of Hamotus, wherethe other four North American species are placed.The males of electrae are readily distinguished fromall other Hamotus (Hamotoides) species by thetransverse impression of the metasternum, and themetasternal laminae projecting posteriorly near themesal margins of the metacoxae in males.Trimioiircus musamator n. sp.(Figs. 24-26)Description.-Length 1.16-1.24. Male head withvertex extended and flattened laterally, eyes not~~ Of;;18oClI/, r '22Figs. 18-26.-18-19, Texamaurops reMelli: 18, posterior view, right metatibia of female; 19, dorsal and right lateral view,aedeagus. 20, Cylindrarctus bicomis, dorsal view, male head. 21, Tmesiphorns costalis, dorsal view, male head. 22-23, Hamotuselectrae: 22, dorsal view, male head; 23, dorsal and right lateral view, aedeagus. 24-26, Trimioarcus musamator: 24, dorsal view,male head; 25 posterior view, male right middle leg; 26, dorsal and right lateral view, aedeagus. Scale line equals 0.1.251