Hyloscirtus diabolus sp. nov. (Figs. 1–3) Holotype. CORBIDI 12885, adult male, Peru, Departamento de Amazonas, Provincia de Chachapoyas, Distrito La Jalca, km 10 from La Colpa–Rodríguez de Mendoza (-6.398944, -77.226278, 2300 m a.s.l.) Collected 14 November 2012 by Karla García-Burneo. Paratype. MUSA 3864, adult male, Peru, Departamento de Amazonas, Provincia de Pedro Ruiz Gallo, Comunidad Shipasbama (-5.845833, -78.071944, 2180 m a.s.l.). Collected on 18 September 2011 by Roy Santa Cruz Farfán. Diagnosis. Hyloscirtus diabolus (Fig. 1) can be diagnosed by the following characters: large size (SVL 82.3– 89.2 mm, n = 2); vertical keel in the snout and upper lip cleft in the region of the premaxilla; vomerine odontophores with a conical-shape and a gap medially, each process with two or three prominent teeth; large, thick, supracloacal flap and supratympanic fold present; finger webbing formula: I 2 ½ –2½ II 1 2/3–2 2/3 III 2 +– 2 IV, toe webbing formula: I 1 1/2 –2- II 1 -–2 III 1 1/2 –2 1/2 IV 2 1/2– 1- V; nuptial pad absent; hypertrophied forelimbs and enlarged, curved and protruding spine prepollex present; fleshy calcar tubercle present; dorsum, thighs, shanks, finger, toes and discs brown with abundant tiny yellow marks; iris dark red without reticulation. Comparison. The only species of the H. larinopygion species group with hypertrophied forelimbs in adult males and broad elliptical prepollex, modified as a projecting spine, are H. tapichalaca (Kizirian et al. 2003), H. condor Almendáriz et al. 2014, and H. diabolus. The remaining species of the group lack the hypertrophied forelimbs and their prepollex is trapezoidal (Kizirian et al. 2003; Rivera-Correa and Faivovich 2013; Table 1). Hyloscirtus diabolus differs from H. condor by having a strongly well developed, fleshy, heel tubercle (absent in H. condor), dark red iris (iris golden with fine tan reticulations in H. condor), gular region and belly dark reddish gray with pink marks in preservation (belly olive without marks and chest is light gray in H. condor), vertical keel in the snout and upper lip cleft in the region of the premaxilla (absent in H. condor) and greater adult male SVL (H. condor: 64.8–73.8 mm, n = 7 in). The new species differs from H. tapichalaca in dorsal and lateral color pattern: dorsum gray or brown, flanks gray brown, bearing pink-orange marks more conspicuous in axillary and inguinal regions, lateral and lower margin of cloaca, knee, elbow, and outer margin of forearm white in H. tapichalaca; and ventral color pattern: gular region and belly dark reddish gray with pink marks in preservation to H. diabolus (belly gray-blue and chest is light gray in H. tapichalaca), digital discs brown (digital discs white in H. tapichalaca), iris dark red (iris yellow-gold with fine black reticulations in H. tapichalaca), upper lip cleft in the region of the premaxilla (absent in H. tapichalaca) and greater adult male SVL (H. tapichalaca: 59.1–63.8 mm, n = 8). For a summary of others diagnostic characters of the H. larinopygion species group, see Table 1. ……continued on the next page Description of holotype. Adult male, 82.3 mm SVL (Fig. 2). Body robust. Head 13% wider than long; head as wide as body; head width 35% of SVL; head length 27% of SVL. Snout rounded in dorsal view, truncate in profile (Fig. 3 A–B); canthus rostralis rounded, distinct; loreal region weakly concave, nearly vertical; lips rounded, faintly flared; nostrils slightly protuberant, directed anterolaterally, located at level of anterior margin of lower jaw. Vertical keel on snout and upper lip cleft in region of premaxilla. Dorsal surface of internarial region concave. Interorbital distance slightly greater than upper eyelid width. Eye prominent, diameter greater than eye–nostril distance. Tympanum barely visible, round, positioned vertically such that is not visible from above; diameter 51% of eye diameter; tympanic annulus inconspicuous. Supratympanic fold prominent, extending from posterior to eye to posterior margin of arm insertion, slightly covering dorsal edge of tympanic membrane. Region between head and suprascapula depressed. Vomerine odontophores conical, separated by gap medially, positioned posterior to choanae; each process with 2–3 prominent teeth. Choanae small, ovoid, separated by a minimum distance greater than 3.5 times their maximum diameter. Tongue cordiform, barely free around lateral and posterior margin. Vocal slits longitudinal, originating on lateral to tongue and extending extending to the corner of the mouth. Vocal sac evident externally, large, single, median, subgular. Mental gland absent. Upper arms and forearms hypertrophied; axillary membrane absent; ulnar fold and tubercles absent. Fingers short, thick, bearing large, ovoid discs, circumferential groove of each disc clearly defined; width of disc on Finger III 46 % greater than tympanum diameter. Relative lengths of fingers I

Published as part of Rivera-Correa, Mauricio, García-Burneo, Karla & Grant, Taran, 2016, A new red-eyed of stream treefrog of Hyloscirtus (Anura: Hylidae) from Peru, with comments on the taxonomy of the genus, pp. 29-41 in Zootaxa 4061 (1) on pages 30-35, DOI: 10.11646/zootaxa.4061.1.3, http://zenodo.org/record/270357