Identification key to the subgenera and species of Orinda Kirkaldy, 1907

1. Posterior wings rudimentary (subgenus Orinda Kirkaldy, 1907) ...................................................... ............................................................................................... O. (Orinda) lucindae (Kirkaldy, 1906)

– Posterior wings well developed, trilobed (Figs 1D, 11D) ................................................................ 2

2. Body parallel-sided in dorsal view (Fig. 1A); posterior wings with CuA and CuP merging apically (Fig. 1D) ( Montorinda subgen. nov.) ............................................................................................... 3

– Body wider at anterior third in dorsal view, tapering towards apex (Fig. 11A); posterior wings with CuA and CuP fused along distal ¼ (Fig. 11D) ( Scapulorinda subgen. nov ...................................... ..................................................................................... O. (Scapulorinda) scapularis (Jacobi, 1928)

3. Anterior tibiae elongate and slender, with parallel margins, about 4.6× as long as wide (Figs 1A–B, F, 2A–B, F); dorsal process of gonostyli with anterior margin more or less straight in lateral view (Fig. 3A); gonostyli in posterior view without lateral hump under the dorsal process (Fig. 3C); aedeagus in anterodorsal view abruptly angularly expanded laterally at about midlength (Fig. 3J) .. ................................................................................................. O. (Montorinda) eungellana sp. nov.

– Anterior tibiae rather short and laterally dilated, with lateral margin broadly rounded, about 3.8 × as long as wide (Figs 7A–B, D, 8A–B, F); dorsal process of gonostyli with anterior margin curved anteriorly in lateral view (Fig. 9A); gonostyli in posterior view with strong lateral hump under the dorsal process (Fig. 9C); aedeagus in anterodorsal view smoothly obliquely expanded laterally at about midlength (Fig. 9J) ............................................................ O. (Montorinda) montana sp. nov.