. Bulletin - United States National Museum. ^ of the tenuis groupas diagramed in figure 36. Ancestral stock of this group (designated. Figure 35.—Distribution of tenuis group of Stygonectes in south-central United States.[O S. a. alabamensis; O S. a. occidentalis; ® S. barri; A S. hoiumani; X S. clantoni;A 5. elatus; ? S. montanus; + S. ozarkensis. Two symbols in a circle indicate twospecies from the same locahty.] 152 NATIONAL MUSEUM BULLETIN 259

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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience