Key to the genera of owlflies (subfamily Ascalaphinae) from Pakistan

1. Eyes divided by a transverse furrow into upper and lower portions (Fig. 1D)....................................... 2 _. Eyes entire, without transverse furrow (Fig. 23B)........................................................... 12

2. Anal area of forewing with distinct triangular projection (Fig. 8)................................................ 3

_. Anal area of forewing without distinct triangular projection (Fig. 1A)............................................ 4

3. Pterostigma wider than long (Figs 9C–D); wings broadest at middle (Fig. 8)..................... Glyptobasis McLachlan

_. Pterostigma longer than wide (Figs 11E–H); wings narrow, not broadest at middle (Figs 10A–B).......... Nousera Navás

4. Basal flagellomeres in male with distinct lateral spines (Fig. 1G); larger species, forewing c. 45 mm ..... Acheron Lefèbvre

_. Basal flagellomeres in male without distinct lateral spines; generally smaller species with forewing length usually less than 40 mm ................................................................................................ 5

5. Apical area beyond Sc+R with three rows of cells (van der Weele 1909: fig. 184; Ábrahám 2008b: fig. 7).................................................................................................... Ascalohybris Sziráki

_. Apical area beyond Sc+R with two rows of cells (Figs 14A–C)................................................ .. 6

6. Male with long or short ectoprocts, without median branch (Figs 17A–B, 21C)..................................... 7

_. Male with long ectoprocts, with a long median branch (Yang et al. 2016: figs 10–13).............................. .. 11

7. Male with short ectoprocts, not longer than the last two abdominal segments taken togehter (Fig. 21C)................. .. 8

_. Male with long ectoprocts, longer than the last two abdominal segments taken together, extended ventrad in lateral view, cylindrical, rounded at distal margin (Fig. 18C)............................................... Ogcogaster Westwood

8. Antennae as long as distance between base of forewing to pterostigma; male tergum 3 with distal process (Mészáros & Ábrahám 2005: figs 1–2, 5)................................................................... Stylascalaphus (Sziráki)

_. Antennae shorter than distance between base of forewing to pterostigma (Figs 19A–B); male tergum 3 without distal process. ................................................................................................... 9

9. Pterostigma longer than wide.......................................................................... .. 10

_. Pterostigma short, about as long as wide................................................... Suhpalacsa Lefèbvre

10. Body mainly dark brown; male abdomen longer than hind wing (Fig.19A)................ .. Suphalomitus van der Weele

_. Body mainly brownish yellow; abdomen in both male and female shorter than hind wing (Figs 4A–C, 5A–C)............................................................................................... Ascalaphus Fabricius

11. Wings hyaline, without brownish marking (Yang et al. 2016: figs 10–13).......................... Bubopsis McLachlan

_. Wings hyaline, except hind wing with brownish spot below pterostigma (Rodríguez-Flores et al. 2017: figs 1A–B)........................................................................................ Deleproctophylla Lefèbvre

12. Tibial spurs as long as Ta1–Ta4; male tergum 3 with distal process; wing membrane dark brown or hyaline with dark markings; apical area beyond Sc+R with some forked longitudinal veins (Ábrahám & Mészáros 2002: figs 8–11).............................................................................................. Ptyngidricerus van der Weele

_. Tibial spurs as long as Ta1–Ta2 or Ta1–Ta3; male tergum 3 without distal process; wing membrane hyaline or dark brown to yellowish brown specklings; apical area beyond Sc+R with two or three rows of cells.............................. .. 13

13. Tibial spurs as long as Ta1–Ta3; forewing with anal angle distinctly produced to a triangular projection; pterostigma yellow; cubital area with 8–11 rows of cells medially in forewing and 7–8 in hind wing (Needham 1909: fig. 1)...................................................................................................... Abronius Needham

_. Tibial spurs as long as Ta1–Ta2 or Ta1–Ta3; forewing with anal angle weakly or distinctly produced to a triangular projection; pterostigma pale yellow to dark brown; cubital area with less than seven rows of cells in both fore- and hind wing...... .. 14

14. Apical area beyond Sc+R with two rows of cells (Figs 23C–D)................................. Idricerus McLachlan

_. Apical area beyond Sc+R with three rows of cells (Zhang et al. 2015: figs 11, 14)............. Protidricerus van der Weele