Hyloxalus exasperatus H. whymperi Ameerega erythromos

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(1) SVL, males, 20.8-22.6, n = 3; adult females, unknown; (2) disc on Finger III expanded; (3) Finger I = II; (4) fringe absent on Finger II; (5) disc on Toe IV expanded; (6) fringe absent on Toe IV; (7) outer tarsal fold absent; (8) webbing absent; (9) dorsolateral stripe present; (10) oblique lateral stripe absent; (11) ventrolateral stripe absent; (12) discrete markings absent on chest; (13) black darkening on abdomen with white spots in males; (14) Finger III not swollen in males; (15) testes white.Colostethus whymperi is compared with C. exasperatus that lacks oblique and ventrolateral stripes, and webbing on the toes. They differ because C. whymperi has a solid dark darkening in abdomen of males rather than diffuse dark and white spots in abdomen of males of C. exasperatus. Colostethus whymperi closely resembles Epipedobates erythromos from which it differs by having solid black darkening on venter in contrast to the marbled patterns of E. erythromos.

The holotype is a male 22.6 mm in SVL (24 mm according to Boulenger, 1882). It is in poor condition, and few characters can be described precisely. No color patterns are visible. Comparison of the type specimen with material from localities in the vicinity of the type locality revealed that three specimens from San Francisco de Las Pampas, can be assigned to this species. Herein, I describe a male [MNHG (GO 43)] from this series and indicate (in parentheses) any differences from the original description.Male, 20.8 mm in SVL; body moderately robust; head about as long as wide; head length 37% SVL; head width 36.5% SVL; snout bluntly rounded in dorsal view, distinctly protruding beyond lower jaw in profile; loreal region barely concave; nostrils slightly protuberant laterally; eye-nostril distance half diameter of eye; supratympanic fold obscuring posterodorsal part of tympanum (tympanum entirely distinct); diameter of tympanum 36.4% diameter of eye; forelimbs moderately long; Fingers I and II about equal in length; fingers unwebbed, lacking lateral fringes; Finger III not swollen; terminal discs expanded; subarticular tubercles large, rounded (indistinct); palmar tubercle large, rounded, elevated; thenar tubercle elliptical; nuptial excrescences absent. Hind limbs robust; tibia length 50.5% SVL; outer tarsal fold absent; inner tarsal fold sigmoid on distal two thirds of tarsus; outer metatarsal tubercle round, about half size of elliptical inner metatarsal tubercle (outer metatarsal tubercle absent; inner metatarsal tubercle indistinct); toes unwebbed, without narrow lateral fringes, with slight hint of lateral keels; terminal discs expanded, about twice width of digits (discs of fingers and toes small); subarticular tubercles small, oval; supernumerary tubercles absent. Skin on all surfaces smooth; three small tubercles posteroventral to tympanum; anal opening extended posteroventrally at midlevel of thighs by anal sheath; tongue narrowly triangular, indented posteriorly, free posteriorly for about two thirds of its length; vocal slits present; vocal sac single, median, subgular.Color in preservative: Dorsum and flanks uniformly black; short pale oblique lateral stripe in groin; narrow dorsolateral stripe from tip of snout along canthus rostralis and margin of upper eyelid to anal region; tympanic region dark brown; upper lip black; dorsal and anterior surfaces of forearms black; posterior surfaces of upper arm black proximally, white distally; dorsal surfaces of hind limbs black with some diffuse pale white proximally on thighs; throat and chest black, gray in gular region, abdomen black with white spots (throat and abdomen marbled with gray); white flecks in groin; ventral surfaces of limbs cream; palmar, ventral surfaces of tarsi, and plantar surfaces black; inner three digits of hands and feet gray with white transverse bands; other digits with diffuse transverse bands.  Variation.—A juvenile female MNHG (GO 41) has black bars across the thigh; venter is uniform gray.

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