Comparative Meristic Variability in Whiptail Lizards (Teiidae,<i>Aspidoscelis</i>): Samples of Parthenogenetic<i>A. tesselata</i>Versus Samples of Sexually Reproducing<i>A. sexlineata, A. marmorata</i>, and<i>A. gularis septemvittata</i>
American Museum novitates