Emended key to Zealeuctra males.

The following couplets from the key to Zealeuctra males are from Grubbs et al. (2013). New couplets are proposed to include the new species.

9 Epiproct comprised of two prominent spines, a large posterior spine plus an accessory anterior spine (fig. 10B, Grubbs et al. 2013) ……………………...… Z. warreni Ricker & Ross

9’ Epiproct bearing only a small, subterminal cusp posterior to the main spine (Figs. 10–12 & 20, figs. 1B, 4C, Grubbs et al. 2013) ………… 10

10 Cleft narrowly U-shaped anteriorly and divergent posteriorly with the inner margins sinuate (Figs. 7–9); currently known only from North Carolina …………………..… Z. uwharrie Verdone, Beaty, Holland & Kondratieff

10’ Cleft broadly U-shaped (Fig. 21, figs. 1A, 4 A, Grubbs et al. 2013); known only from Texas or widely distributed …………………………… 11

11 Epiproct base bearing a conspicuous, slightly concave cusp anteriorly (figs. 1B–C, Grubbs et al. 2013); known only from Texas (fig. 12, Grubbs et al. 2013) ..… Z. arnoldi Ricker & Ross

11’ Epiproct base simple (Fig. 20) and lacking a prominent cusp, at most, only a very small rounded projection anteriorly (Fig. 20, fig. 4C, Grubbs et al. 2013); sporadically distributed across the central and eastern USA (fig. 11, Grubbs et al. 2013) ..… Z. fraxina Ricker & Ross