Key to species (males) of Ackbaria

1. Aedeagus with base well-developed and differentiated from shaft; shaft narrow, arising caudodorsally from aedeagus base, curved anterad (3H,I).................................................................... A. jujuyensis n. sp.

1’. Aedeagus with base not well-differentiated from shaft; shaft broad.............................................. 2

2(1). Male pygofer and usually apex of female tergite VIII darkly pigmented (as in 3A,B); male tergite VIII and female tergites VII and VIII with macrosetae (5T); aedeagus relatively slender, apex with anterodorsal flange, without distinct lateral flange....................................................................... A. vermiformis Campodonico & Zahniser

2’. Male pygofer and female tergite VIII not darkly pigmented (4A1,A2,B); male tergite VIII and female tergites VII and VIII without macrosetae (4A1,A2,B); aedeagus stout, with lateral flange (4H,I)........................ A. ojosverdes n. sp.