Tomarus rostratus Dupuis, 2014

Ratcliffe, Brett C., Cave, Ronald D. & Mondaca, José, 2021, The Dynastine Scarab Beetles (Coleoptera: Scarabaeidae: Dynastinae) of Chile, The Coleopterists Bulletin 75 (2), pp. 279-309 : 293

Tomarus rostratus Dupuis, 2014

( Figs. 26–29 )

Tomarus rostratus Dupuis 2014: 1 (original combination).

Redescription. Length 17.4–27.5 mm; width 8.3–10.1 mm. Color dark reddish brown. Head: Frons rugose. Frontoclypeal region with 2 transverse tubercles separated by about 3 tubercle diameters. Clypeus subtrapezoidal, apex subtruncate and with 2 nearly contiguous, triangular teeth. Mandibles with rounded basal lobe and 2 rounded teeth. Antennal club subequal in length to antennomeres 2–7. Interocular width equals 4.7 transverse eye diameters. Pronotum: Surface with moderately large, moderately dense punctures, punctures becoming denser on apical and lateral margins. Apical margin with small tubercle (best seen in lateral view) followed by nearly obsolete, elongate, shallow fovea. Base lacking marginal bead. Elytra: Surface punctate-striate in 3 double rows, punctures moderately large, ocellate. Legs: Protibia tridentate with small, basal swelling suggestive of fourth tooth. Protarsus simple, not enlarged. Metatibial apex with 8–15 spinules. Pygidium: Disc glabrous, with small, sparse punctures. Base transversely rugopunctate. In lateral view convex in male, nearly flat in female. Venter: Prosternal process long, thick, apex transversely oval or round and with long, testaceous setae. Parameres: As in Fig. 28 .

Distribution. Tomarus rostratus occurs in the coastal deserts of Peru and northern Chile ( Dupuis 2014; López-García and Deloya 2018).

Locality Records ( Fig. 29 ). 15 specimens from FSCA and JMEC .

REGIÓN DE ARICA Y PARINACOTA (15): ARICA (15): Cuya, Poconchile, Taltape, Valle Azapa (6 km E Arica ) .

Temporal Distribution. February (13), March (2).

Diagnosis. The pronotal fovea of T. rostratus is narrowly elongate, whereas the fovea of T. maimon is round. The clypeal apex in T. rostratus is more broadly subtruncate but narrowly bidentate in T. maimon . The protibia is tridentate with a basal swelling suggestive of a fourth tooth in T. rostratus but tridentate in T. maimon . Lastly, the parameres are unique (compare Figs. 28 and 24 ).

Natural History. Nothing is known of the natural history of this rare species. Specimens have been taken at 12–1,036 m elevation.

Figures

Figs. 26–29. Tomarus rostratus. 26) Holotype, MNHN-EC-2378-EC4187; 27) Holotype labels; 28) Parameres; 29) Distribution. Images in Figs. 26–27 courtesy ofAntoine Mantilleri (Muséum National d’Histoire Naturelle, Paris, France).

Figs. 23–25. Tomarus maimon. 23) Habitus; 24) Parameres; 25) Distribution.