. Bulletin - United States National Museum. itat. The latterspecies, however, is known from cave waters in the surroundingcounties of Val Verde, Uvalde, and Real and from other caves inSchleicher and Hays Counties (Bowman, 1964; Reddell, 1965).Distributional patterns of S. hadenoecus and C. texensis appear todiffer significantly, but many caves in west-central Texas remain to berecorded and explored, and the chances of finding additional popula-tions of S. hadenoecus or even related species do not appear altogetherunlikely. SUBTERRANEAN AMPHIPOD STYGONECTES 145 The pizzinii group.—The mutually
. Bulletin - United States National Museum. itat. The latterspecies, however, is known from cave waters in the surroundingcounties of Val Verde, Uvalde, and Real and from other caves inSchleicher and Hays Counties (Bowman, 1964; Reddell, 1965).Distributional patterns of S. hadenoecus and C. texensis appear todiffer significantly, but many caves in west-central Texas remain to berecorded and explored, and the chances of finding additional popula-tions of S. hadenoecus or even related species do not appear altogetherunlikely. SUBTERRANEAN AMPHIPOD STYGONECTES 145 The pizzinii group.—The mutually exclusive ranges of the two speciesof the pizzinii group are shown in figure 34. Distributional data indi-cate a rather wide range for S. pizzini s. str., extending from theeastern margin of the Piedmont (Fall Zone) in the vicinity of Wash-ington, , and Fairfax Co., Va., northeastward through Marylandand into Pennsylvania. The range of this species is apparently re-stricted to the Piedmont province. S. indentatus, on the other hand,. Figure 34.—Distribution of Slygonedes in eastern United States. [The tenuis group:X S. allegheniensis; + S. hayi; 9 S. t. tenuis. S. t. potomacus: O single localities, 0three or more nearby localities. The pizzinii group: A S. indentatus; A^S. possible hybrid population between S. hayi and S. t. potomacus (see text). Twosymbols in a circle indicate two species from the same locality.] 146 NATIONAL MUSEUM BULLETIN 259 is presently known only from two localities in the Coastal Plain inNansemond Co., Va. As presently delineated, the ranges of thesetwo species are separated by the Fall Zone and three major or not either species occupies a wider range than now indi-cated by collecting records must await future biological exploration ofthe approximately 150 mile expanse of coastal plain that lies betweenthe Washington, area to the north and the Hampton Roadsarea to the south. On the basis of present data, howe
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