Key to the species of Navigator

Prerequisite for the use of this key is sex determination of the specimen. In males of N. fossor, N. ruficornis, and N. pixii ( N. interior not yet known), males have a longitudinal abdominal impression or flat sternites, antennal club length longer than antennomeres 1–7, and non-spatulate metatibial internal spur. Females of all Navigator species have medially convex sternites, antennal club length equal to or less than antennomeres 1–7, and spatulate metatibial internal spur.

1 Preclypeus shallow (Fig. 1 A, detail 5 and cross-section 6); clypeal lateral declivity absent (Fig. 1 A, details 2, 7). Female abdominal sternites distended (Fig. 1 E, detail 1); disc of pygidium visible in dorsal view (Fig. 1 D, detail 8)............... 2

– Preclypeus deep (Fig. 1 B, detail 2 and cross-section 3); clypeal lateral declivity present (Fig. 1 B, details 1 and 4). Female abdominal sternites not distended; pygidium not well visible in dorsal view (Fig. 1 D, detail 9)......................... 3

2 Male metatibia internal margin with longitudinal setose groove, apex unispinose (Fig. 1 K, detail 1). Metacoxa posterolateral angle angulate (Fig. 1 G, detail 1). Male size 9.6–11.7 mm. Female 12.5–14 mm, ovoid. From southeastern Queensland .......................................................................... N. pixii Moeseneder & Hutchinson, 2016

– Male metatibia internal margin not grooved, apex trispinose (Fig. 1 H, detail 3). Metacoxa posterolateral angle broadly arcuate (Fig. 1 G, detail 2). Male size 14.8–16.2 mm. Female 16.8–18.9 mm, elongate ovoid. From Western Australia ................................................................................................. N. fossor (Lea, 1914)

3 Metatibia with large, median denticle (Fig. 1 I, detail 1). Metacoxa posterolateral angle angulate (Fig. 1 G, detail 1)..................................................................................... N. ruficornis (Westwood, 1874)

– Metatibia with small, median denticle (Fig. 1 J, detail 1). Metacoxa posterolateral angle spinose (Fig. 1 G, detail 3)........................................................................... N. interior Moeseneder & Hutchinson, 2016