-A new species of Phrynopus is described from elfin forest (3450 m) in the Yungas of La Paz, Bolivia. The new species is most readily differentiated from its congeners by its distinctive coloration, smooth skin, basal webbing, and first finger much shorter than second. RESUMEN.-Se describe una nueva especie de Phrynopus procedente de ceja de montafia (3450) en los Yungas de La Paz, Bolivia. La nueva especie se distingue de los demis miembros del genero por su color distintivo, piel lisa, membrana basal en las patas, y primer dedo de la mano mas corto que el segundo. The leptodactylid frogs of the genus Phrynopus occur in paramo, subparamo, and cloud forests along the eastern slopes of the Andes in Colombia, Ecuador, Peru, and Bolivia. They were reviewed by Lynch (1975) who recognized 14 species. Since that review, Syrrhophus juninensis Shreve was shown to be a species of Phrynopus (Cannatella, 1985) rather than Telmatobius as originally thought (Lynch, 1978), and six new species have been described (Cannatella, 1984; Lynch, 1986; Hedges, 1990; De la Riva, 1992). In Bolivia, three species have been reported previously. Phrynopus laplacai occurs from paramo to cloud forest in the Yungas of La Paz (Cei, 1968; Ergueta, 1993). The newly described species P. kempffi is known only from cloud forest along the crests of mountains in the Serrania de Siberia (De la Riva, 1992). De la Riva (1990) predicted the occurrence of Phrynopus peruvianus in Bolivia, and this species's presence in the country was later confirmed for the department of La Paz (Kohler, 1995). While exploring the headwaters of the Rio Miguillas, La Paz, Fernando Guerra and Eduardo Foro discovered a fourth species of Phrynopus from Bolivia. We propose that this new species be called Phrynopus pinguis sp. nov. Fig. 1 Holotype.-CBF (Colecci6n Boliviana de Fauna) 1906, an adult female collected at Choquetanga Chico, Provincia Inquisivi, Departamento La Paz, Bolivia by J. Fernando Guerra S. and Eduardo Forno G on 18 August 1994. Paratypes (two males, five females).-CBF 190708, CBF 1911-12, and UTA (University of Texas at Arlington) 48731-33 collected with the holotype. Diagnosis.-A small species of Phrynopus (SVL to 20.1 mm) possessing the following characteristics: (1) dentigerous process and teeth absent; (2) tympanum visible under skin; (3) first finger much shorter than second; (4) tips of digits slightly swollen, not expanded laterally; (5) webbing of toes basal, lateral fringes absent; (6) two metatarsal tubercles, no tarsal fold; (7) skin of dorsum and venter smooth; (8) adults rotund with legs short relative to SVL; (9) dorsum charcoal-gray; (10) venter immaculate yellow or charcoal-gray. Phrynopus pinguis is most likely to be confused with the possibly sympatric species P. peruvianus. The new species differs from P. peruvianus (characteristics in parenthesis) by having the first finger much shorter than the second (slightly longer or equal to second), basal webbing (basal webbing absent on toes), and short legs (long legs) relative to its SVL. Phrynopus laplacai occurs in similar habitats as P. pinguis (Ergueta, 1993) and in adjacent valleys to the type locality of the new species. However, the new species is much smaller (P. laplacai reaches SVL of 33.4 mm fide Ergueta, 1993), has smooth skin (areolate), has the first finger shorter than the second (longer), and has basal webbing (no basal webbing). Phrynopus pinguis is distantly allopatric from the remaining species of Bolivian Phrynopus, P. kempffi, and differs by having the dorsum charcoal-gray (reddish brown) and venter immaculate yellow or charcoal-gray (venter cream with white and/or black spots). Description.-Body rotund; head not distinct from neck, 24% of snout-vent length; head about three-fourths as long as wide (Fig. 2); interorbital region flat; cranial crests absent; eyelid width about three-fourths of interorbital distance; snout round in dorsal view and in profile; This content downloaded from 157.55.39.139 on Sat, 26 Nov 2016 04:07:13 UTC All use subject to http://about.jstor.org/terms NEW BOLIVIAN PHRYNOPUS FIG. 1. Holotype on left (dorsal aspect, SVL = 20.1 aspect, CBF 1910) of Phrynopus pinguis sp. nov. lips not flared; nostrils not protuberant; snout short; eye-nostril distance about equal to distance from nostril to tip of snout; interarial region not depressed; canthus slightly concave, rounded in cross section; loreal region sloping and only weakly concave; tympanum visible under skin; dorsal and caudal edges of tympanic annulus concealed by low supratympanic fold; diameter of tympanum about half of eye diameter; tongue oval, lacking posterior notch; choanae oval at anterolateral edge of palate, widely spaced, and dorsal to palatal shelf; dentigerous processes of vomer absent. Skin of venter and dorsum smooth but with numerous round, cream-colored glands under its surface; folds and tubercles entirely lacking from dorsal and ventral surfaces other than on
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