Key to species of Stirellus Osborn & Ball from Pakistan

1. Crown more than twice as long as width between eyes (Fig. 1A, 1C)............................... S. capitatus n. rec.

- Crown less than twice as long as width between eyes (Figs 2A, 3A, 4A, 5A)...................................... 2

2. Crown and/or pronotum, mesonotum and scutellum with orange-red to brownish red markings (Fig. 5 A–B)............. 3

- Crown and/or pronotum, mesonotum and scutellum without orange-red to brownish red markings (Figs 2A, 3A, 4A)....... 5

3. Crown and pronotum, mesonotum and scutellum with longitudinal orange-red bands (See Shah et al., 2020: 192, Fig. 1 A–B)........................................................................................ S. kumratensis

- Crown with transverse band, with or without surplus spots, orange-red to brownish-red (Fig. 5 A–B)................... 4

4. Crown anterior margin rounded (Fig. 5 A–E)............................................... S. rubrolineatus n. rec.

- Crown anterior margin acutely angled (See Shah et al., 2020: 194, Fig. 3 A–C).......................... S. neoconvexus

5. Aedeagus small, with apex not curved dorsad (See Shah et al., 2020: 195, Fig. 4H)....................... S. thattaensis

- Aedeagus large, with apex curved dorsad (Figs 2I, 3H, 4H).................................................... 6

6. Subgenital plate with macrosetae not uniseriate laterally (Fig. 3F)............................................... 7

- Subgenital plate with macrosetae uniseriate laterally (Figs 2F, 4F)............................................... 8

7. Crown with anterior margin slightly bulbous (See Shah et al., 2020: 200, Fig. 9A); subgenital plate somewhat concave at near midlength (See Shah et al., 2020: 201, Fig. 10B); connective stem longer than anterior arms (See Shah et al., 2020: 201, Fig. 10C)...................................................................................... S. mankiensis

- Crown with anterior margin not bulbous (Fig. 3A, 3C); subgenital plate not concave at near midlength (Fig. 3F); connective stem equal in length to anterior arms (Fig. 3F).............................................. S. pakhtunensis sp. n.

8. Crown with subapical spots (Fig. 2A, 2C); pygofer lobe with few macrosetae (Fig. 2E).................. S. indrus n. rec.

- Crown without subapical spots (Fig. 4A, 4C); pygofer lobe without macrosetae (Fig. 4E).............................9

9. Crown acutely produced (See Shah et al., 2020: Figs 2A, 5A)................................................. 10

- Crown not acutely produced (Fig. 4A, 4C)................................................................ 11

10. Crown 1.5x longer than breadth between eyes (See Shah et al., 2020: 193, Fig. 2A). Pygofer lobe with caudal region curved (See Shah et al., 2020: 193, Fig. 2E)............................................................. S. lahorensis

- Crown less than 1.5x longer than breadth between eyes (See Shah et al., 2020: 196, Fig. 5A). Pygofer lobe with caudal region smooth (See Shah et al., 2020: 196, Fig. 5C)........................................................ S. viridulus

11. Crown evenly rounded anteriorly (Fig. 4A, 4C)................................................ S. rotundus n. rec.

- Crown angularly rounded anteriorly (See Shah et al., 2020: 192, Figs 6A, 6C, 8A, 8D).......................... S. tolla