Key to genera of the tribe Coelidiini from the Indian subcontinent

1. Aedeagus with broad, tubular shaft, sometimes with laminate margin or with longitudinal cavity with one or two apical processes (Figs. 26 D–F, K–H, 53 A, D)...................................................................... 2

- Aedeagus with narrow tubular shaft with or without processes (Figs. 15 A, 23 A, 27 A, 36 B)......................... 3

2. Aedeagus with shaft broad throughout, with two apical processes (Figs. 53 A–D).................... Zhangolidia Nielson

- Aedeagus with shaft broad but tapered distally with one apical and one subapical processes (Figs. 26 D–F, L–M)................................................................................................ Mahellus Nielson

3. Aedeagus with longitudinal cavity on dorsal or lateral margin of shaft (Figs. 24 P–Q, U–V)........... Hiatusorus Nielson

- Aedeagus without such cavity on shaft.................................................................... 4

4. Aedeagus with shaft glabrous or nearly so (Figs. 27 A–B); pygofer with long caudodorsal process (Figs. 25 F–H)............................................................................................... Glaberana Nielson

- Aedeagal shaft with one to many short to very long processes (Figs. 15 A–B, 23 B, 27 A–B, 42 A–B); pygofer caudodorsal process variable...................................................................................... 5

5. Aedeagus with numerous short spine-like processes in medial or distal 1/3 of shaft (Figs. 24 C–D, 38 C–D)............. 6

- Aedeagus with 1–5 processes on shaft (Figs. 31 A, 46 A) rarely with short row of processes (Fig. 37 B)................. 7

6. Aedeagus with apical to subapical processes on shaft (Figs. 24 C, D, G, H, K, L)................... Creberulidia Nielson

- Aedeagus with numerous setae restricted to margins of gonopore (Figs. 40 C, D, G, H)............... Orbisolidia Nielson

7. Aedeagus with 1–3 long apical or subapical glabrous or spinose processes, sometimes with short subequal processes on aedeagal shaft (Figs. 15 A, 29 A, 33 A–B)...................................................................... 8

- Aedeagus with 1–3 very short, glabrous apical or subapical processes accompanied with patch of short teeth on distal margin of shaft and short row of setae basad of apex (Figs. 51 A–C, 52 A–C)............................. Webbolidia Nielson

8. Aedeagus with only one glabrous or spinose process (Figs. 29 A, 30 A, 41 A)...................................... 9

- Aedeagus with two or more processes of which one may be spinose or furcate (Figs. 18 A, 23 A, 44 A)................ 10

9. Aedeagus with glabrous process, sometimes apex of process toothed (Figs. 41 A–B, 42 A–B)........... Singillatus Nielson

- Aedeagus with complex, multisetose or multispinose process (Figs. 29 A–B, 28 A, 33 A, 36 B)......... Olidiana McKamey

10. Aedeagus with two processes, either glabrous or multisetose (Figs. 18 A–B, 19 A, 22 B)................. Calodia Nielson

- Aedeagus with 3–5 processes, either glabrous or one of them spinose or furcate (Figs. 44 A, 46 A, 47 A, 50 A)................................................................................................. Trinoridia Nielson