\begin{tabular}{rr|cc|c}
\toprule
                         &            & \multicolumn{2}{c}{TestVar} & \multicolumn{1}{c}{} \\
                         &            & A            & B            & Total                \\ \hline
\multirow{3}{*}{Species} &     setosa &           23 &           27 &                   50 \\
                         & versicolor &           24 &           26 &                   50 \\
                         &  virginica &           30 &           20 &                   50 \\ \hline
                         &      Total &           77 &           73 &                  150 \\
\bottomrule
\end{tabular}