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2 sets of 1 or 2 setae each; dactyl rather long andslightly curved, closing beyond palm spines, nailrather short.Type-Iocality.-Interstitial medium of shallowgravel banks of Hondo Creek, just south of the Balconesescarpment, in Medina Co., Texas (see Fig.12). The bedrock in this area is composed of shalesand sandstones of Late Cretaceous age.Distribution and ecology.-This species is presentlyknown only from the type locality, where ithas been collected on three occasions from shallowpits dug into gravel banks of Hondo Creek or frombaited jars placed in these pits. The amphipods apparentlyinhabit an interstitial habitat in the hyporheic(and/or parafluvial) zone of this stream. Arather detailed investigation of the hyporheic zone ofHondo Creek by S. J. Harden (in lilt.) over a periodof several years has resulted in the collection offlatworms, oligochaetes, hydrobiid snails, ostracodes,stenasellid isopods (Mexistenasellus coahuilaCole and Minckley - see Bowman, 1992, in thisvoL), and amphipods. In addition to M. hardeni, theBFig. 5.-Mexiweckelia hardeni, new species, paratypes, Hondo Creek hyporheic, Medina Co., TX, female (4.5 mm): A, B,gnathopods 1,2 (palms and dactyls enlarged). Male (3.2 mm): C, gnathopod 2 (spines enlarged). (All gnathopods to same scale).10