Key to Adults of Actenonyx Species

1 Protarsi with tarsomeres 1 to 3 distinctly broader and bearing pads of adhesive setae ventrally....male................................................................ 2

Protarsi with tarsomeres 1 to 3 slender and without pads of adhesive setae ventrally.....female............................................................... 3

2 Median lobe of male genitalia (Fig. 2 A-B) less arcuate in lateral view, apical lamella shorter, more broadly rounded apically, and nearly centered on shaft in dorsal view; last visible abdominal sternite (VI) with two pairs of apicoparamedial setae (one or three setae present unilaterally or bilaterally in a few specimens)......................... A. bembidioides White

Median lobe of male genitalia (Fig. 2 C-D) more arcuate in lateral view, apical lamella longer, more narrowly rounded apically, and slightly deflected right of center on shaft in dorsal view; last visible addominal sternite (VI) with only one pair of apicoparamedial setae................................................................... A. aotearoa sp. nov.

3 Ovipositor of female (Fig. 3C) with gonocoxite 2 distinctly longer than gonocoxite 1, tergite IX (Fig. 3A) longer, apical margin projected medially and more convex, sclerotization/pigmentation pattern with middle transverse band and apicoparalateral arms thicker and not sharply defined, apicoparalateral arms not extended laterally along the margin (Fig. 3A); intersegmental membrane ventrad tergite IX (Fig. 3C) with distinctly longer and denser setae (at least medially); elytra, with slight to distinct aeneous metallic reflection in most specimens (without or with faint green or blue metallic reflection in a few specimens), elytral silhouette (Fig. 1A) subrectangular, humeri more narrowly rounded......... A. bembidioides White

Ovipositor of female (Fig. 3D) with gonocoxite 2 distinctly shorter than gonocoxite 1, tergite IX (Fig. 3B) shorter, apical margin broadly truncate, sclerotization/pigmentation pattern with middle transverse band and apicoparalateral arms more slender and sharply defined, apicoparalateral arms extended to apical margin and recurved laterally along the margin (Fig. 3B); intersegmental membrane ventrad tergite IX (Fig. 3D) with distinctly shorter and sparser setae; elytra without or with slight blue metallic reflection, elytral silhouette (Fig. 1B) subvoid, humeri more broadly rounded................................. A. aotearoa sp. nov.