X. alvarezi Rosen, 1960
X. andersi Meyer & Schartl, 1980
X. bimaculatus Heckel, 1848
X. birchmani Lechner & Radda, 1987
X. birchmanni Lechner & Radda, 1987
X. brevis Regan, 1907
X. clemenciae Álvarez, 1959
X. continens Rauchenberger et al., 1990
X. cortezi Rosen, 1960
X. couchianus (Girard, 1859)
X. couchianus gordoni Miller & Minckley, 1963
X. evelynae Rosen, 1960
X. gillii Kner, 1863
X. gordoni Miller & Minckley, 1963
X. gracilis Heckel, 1848
X. guentheri Jordan & Evermann, 1896
X. guntheri Jordan & Evermann, 1896
X. helleri Heckel, 1848
X. helleri alvarezi Rosen, 1960
X. helleri brevis Regan, 1907
X. helleri helleri Heckel, 1848
X. helleri signum Rosen & Kallman, 1969
X. helleri strigatus Regan, 1907
X. hellerii Heckel, 1848
X. hellerii guentheri Jordan & Evermann, 1896
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X. jalapae Meek, 1902
X. kallmani Meyer & Schartl, 2003
X. kosszanderi Meyer & Wischnath, 1981
X. maculatus (Günther, 1866)
X. malinche Rauchenberger et al., 1990
X. mayae Meyer & Schartl, 2002
X. meyeri Schartl & Schröder, 1988
X. milleri Rosen, 1960
X. mixei Kallman et al., 2004
X. montezumae Jordan & Snyder, 1899
X. montezumae birchmanni Lechner & Radda, 1987
X. montezumae cortezi Rosen, 1960
X. monticolus Kallman et al., 2004
X. multilineatus Rauchenberger et al., 1990
X. nezahualcoyotl Rauchenberger et al., 1990
X. nigrensis Rosen, 1960
X. obscurus Weyenbergh, 1877
X. pygmaeus Hubbs & Gordon, 1943
X. pygmaeus nigrensis Rosen, 1960
X. rachovii Regan, 1911
X. roseni Meyer & Wischnath, 1981
X. signum Rosen & Kallman, 1969
X. sp. "Apodaca"
X. sp. "Regio"
X. sp. "Tamasopo"
X. strigatus Regan, 1907
X. variatus (Meek, 1904)
X. variatus evelynae Rosen, 1960
X. xiphidium (Gordon, 1932)
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