Key to Australian genera of Ctenocerini sensu

Evans (1972)

Females

1 Antenna with 11 flagellomeres (exceptional for female Aculeata); clypeus subangularly produced apically; malar space longer than pedicel width; in anterior view, vertex forming a low arc above level of eye tops; and metasoma strongly compressed apically (Fig. 5a) Cteniziphontes Evans

- Antenna with 10 flagellomeres; clypeus truncate or emarginate apically (Figs 1a, 2a, 3a, 4a and 5b,c); malar space shorter than pedicel width, except in Evansiclavelia Pitts, Rodriguez & Shimizu, gen. nov. (Fig. 4a); in anterior view, vertex moderately or strongly elevated above level of eye tops; and metasoma not compressed laterally in Apoclavelia Evans but compressed laterally in others......................................... 2

2 Clypeus nearly as wide as LID (Fig. 5b), transversely and rather abruptly bent downward towards its apical margin; propodeal declivity not sharply divided from dorsum; and metasoma shallowly and dorsoventrally compressed posteriorly .................................................. Apoclavelia Evans

- Clypeus much narrower than LID, not transversely deflected downward towards its apical margin (Figs 1a, 2a, 3a, 4a and 5c); propodeal declivity sharply divided from dorsum, except in Evansiclavelia Pitts, Rodriguez & Shimizu, gen. nov. (Fig. 4e); and metasoma laterally compressed apically........ 3

3 Frontal bridge present (Fig. 4a, arrow); malar space longer than pedicel width; propodeal dorsum and declivity not sharply divided (Fig. 4e); and transverse groove on S2 situated anteriorly to its basal third, almost concealed by posterior margin of S1 ..................................... Evansiclavelia gen. nov.

- Frontal bridge absent (Figs 1a, 2a, 3a and 5c); malar space much shorter than pedicel width; propodeal dorsum and declivity sharply divided, both forming angle (Figs 1c,e, 2f,h and 3e,g); and transverse groove on S2 situated posteriorly to its basal third ..................................................................... 4

4 Clypeus flat except depressed basally adjacent to antennal sockets, emarginate apically (Fig. 5c); labrum completely concealed; and transverse groove on S2 weak...................................................... Austroclavelia Evans

- Clypeus convex medially, truncate apically (Figs 1a,b, 2a,b and 3a); labrum well exserted, usually at right angle to clypeus (Figs 1b and 2b); and transverse groove on S2 sharply impressed ............................................................................... 5

5 All tarsal claws unidentate (Fig. 1j); apicomedial corner of scape produced beyond origin of flagellum (Figs 1b,d and 2d); vertex extraordinarily elevated above eye tops (Figs 1a and 2a), distance from eye tops to vertex crest, in profile, about two-fifths of eye height or much more (Figs 1c and 2c); posterior ocelli situated much below level of eye tops; gena, in profile, as broad as or broader than eye, strongly narrowing above and below (Figs 1c and 2c); and gena, in dorsal view, scarcely narrowing posteriad, hence its shape nearly rectangular (Figs 1d and 2e) .............. Maurillus Smith

- All tarsal claws bifid (Fig. 3f); apicomedial corner of scape not produced beyond origin of flagellum (Fig. 3b,d); vertex moderately elevated above eye tops (Fig. 3a), distance from eye tops to vertex crest, in profile, less than one-fifth of eye height (Fig. 3e); posterior ocelli situated at level of eye tops; gena, in profile, much narrower than eye, gently narrowing above and below (Fig. 3e); and gena, in dorsal view, narrowing posteriad, forming rather low arc (Fig. 3b) .............................................. Maurilloides gen. nov.