Xyloryctes Hope, 1837

Bitar, Alberto & Delgado, Leonardo, 2009, A New Species of Xyloryctes Hope (Scarabaeidae: Dynastinae) from Guatemala, with a Key to the Species, The Coleopterists Bulletin 63 (2), pp. 213-217 : 215-217

Key to the species of adult Xyloryctes Hope

(Modified from Endrödi 1985; Delgado and Nájera-Rincón 1992)

1. Apex of last abdominal sternite emarginate (males).......................... 2

1 9. Apex of last abdominal sternite rounded (females).......................... 12

2. Elytra with sutural stria absent or visible in traces........................... 3

2 9. Elytra with sutural stria well defined.......................................... 4

3. Anterior margin of pronotum incomplete. Apex of metatibia with 3 large teeth or lobes. Mexico..................................... telephus Burmeister

3 9. Anterior margin of pronotum complete. Apex of metatibia with 7–8 small teeth. Mexico, Guatemala, El Salvador and Honduras......... ensifer Bates

4. Elytra without rows of punctures.............................................. 6

4 9. Elytra with rows of punctures.................................................. 5

5. Apex of metatibia with 7–8 small teeth. Canada, USA and Mexico............................................................... jamaicensis (Drury)

5 9. Apex of metatibia with 3 large teeth or lobes. Mexico to Panama lobicollis Bates

6. Apex of metatibia with 2 lobes. Parameres incised at apex. Guatemala to Panama........................................................... splendidus Prell

6 9. Apex of metatibia with 3 teeth or lobes or 5–8 small teeth. Parameres not incised at apex................................................................... 7

7. Pronotal process broad behind cavity, apex of process broadly and almost semicircularly rounded, not incised at middle. Mexico and Guatemala..................................................................... corniger Bates

7 9. Pronotal process absent or narrow, if present, apex usually incised........ 8

8. Apex of metatibia with 5–8 small teeth. USA and Mexico... thestalus Bates

8 9. Apex of metatibia with 3 teeth or lobes....................................... 9

9. Pronotal declivity excavated. Pronotal process prominent.................. 10

9 9. Pronotal declivity flattened. Pronotal process absent....................... 11

10. Pronotal process long and slender. Parameres with lateral teeth. Mexico...................................................... furcatus Burmeister

10 9.Pronotal process short and widened. Parameres without lateral teeth. Mexico to Honduras.............................................. teuthras Bates

11. Pronotal declivity oblique. Parameres with lateral teeth. Mexico................................................. howdenorum Delgado and Nájera

11 9.Pronotal declivity vertical. Parameres without lateral teeth. Guatemala......................................................... guatemalensis new species

12. Elytra with sutural stria absent or visible in traces.......................... 13

12 9.Elytra with sutural stria well defined......................................... 14

13. Apex of metatibia with 3 large teeth or lobes. Mexico.. telephus Burmeister

13 9.Apex of metatibia with 7–8 small teeth. Mexico, Guatemala, El Salvador and Honduras...................................................... ensifer Bates

14. Elytra without rows of punctures............................................. 16

14 9.Elytra with rows of punctures................................................. 15

15. Apex of metatibia with 7–8 small teeth. Canada, USA and Mexico............................................................... jamaicensis (Drury)

15 9.Apex of metatibia with 3 large teeth or lobes. Mexico to Panama..................................................................... lobicollis Bates

16. Apex of metatibia with 5–8 small teeth. USA and Mexico... thestalus Bates

16 9.Apex of metatibia with 2–3 large teeth....................................... 17

17. Apex of metatibia with 2 large teeth. Guatemala to Panama.................................................................... splendidus Prell

17 9.Apex of metatibia with 3 teeth................................................ 18

18. Teeth at apex of metatibia with many incisions. Mexico and Guatemala..................................................................... corniger Bates

18 9.Teeth at apex of metatibia entire or with few incisions..................... 19

19. Shorter spur of metatibia of same width along entire length. Mexico................................................ howdenorum Delgado and Nájera

19 9.Shorter spur of metatibia preapically widened............................... 20

20. Pygidium slightly convex to flattened. Length longer than 24 mm ........ 21

20 9.Pygidium convex. Length generally less than 24 mm. Guatemala......................................................... guatemalensis new species

21. Pygidium with distinct setae at base. Mexico to Honduras.... teuthras Bates

21 9.Pygidium glabrous. Mexico................................ furcatus Burmeister