Key to males of Dixa ubiquita group.

1 Apex of basal gonocoxal lobe digitiform, equal in width to gonostylus (Figs 18, 19, 20), with posterior margin noticeably concave in terminal view (Fig. 20). Subepandrial sclerite with proximal lobe broad, rounded ventrally and distal lobe narrow, liplike in lateral view (Fig. 18). Apex of gonostylus straight, not twisted medially (Fig. 19). Northeastern Nearctic south to Appalachian Highlands of NC............................................................. D. vockerothi sp. nov.

- Apex of basal gonocoxal lobe more broadly rounded to squared, wider than gonostylus (Figs 11, 12, 15), with posterior margin straight or slightly concave in terminal view (Figs 14, 17). Subepandrial sclerite with proximal lobe narrow, acute ventrally and distal lobe broad, rounded in lateral view (Figs 11, 12, 15). Apex of gonostylus twisted medially (Figs 13, 16).......... 2

2 Apex of basal gonocoxal lobe in lateral view squared, 1/ 2X as wide as gonocoxal depth at mid-length (Figs 11, 12). Widespread.............................................................................. D. ubiquita sp. nov.

- Apex of basal gonocoxal lobe in lateral view more rounded, 1/3 or less times as wide as median gonocoxal depth (Fig. 15). Currently known only from Little River (East Prong) in the Elkmont area of Great Smoky Mountains NP................................................................................................. D. elkmontensis sp. nov.