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We describe a new species of Nymphargus from Reserva Las Gralarias, in the montane forests of the Pacific versant of the Andes of Ecuador. The new species, Nymphargus lasgralarias sp. nov., is nearly morphologically identical to sympatric Nymphargus griffithsi (Goin 1961), with the exception of the following characters:(i) a gold colored iris with numerous small spots and lighter reticulation,(ii) absence of dark dorsal spotting, and (iii) a significantly larger body size. Additionally, we describe the vocalizations for N. griffithsi and N. lasgralarias. The call of N. lasgralarias sp. nov. is easily distinguished from N. griffithsi through the following temporal and spectral characteristics:(i) calls are emitted in series,(ii) waveform shape is always pulsed,(iii) significantly shorter call duration, and (iv) lower dominant frequency.