Fig. 15: Dicegrams of ear size relative to eye diameter in the two subspecies of Syrrhophus pipilans. N = 17 in nebulosus, 18 in pipilans.
Remarks.—Two subspecies were recognized by Duellman (1958). Previously both had been treated as species. The two populations were distinguished on the basis of color pattern and the size of the tympanum. Measurements of 17 males of S. p. nebulosus from central Chiapas and 18 males of S. p. pipilans from south-central Oaxaca and Guerrero, México, demonstrates that the supposed difference in tympanum size is not significant ([Fig. 15]). There is, however, a tendency for the western population of S. pipilans to have larger tympani. Based on the present examination of 112 specimens of this species the two populations are held to be sufficiently distinct to warrant taxonomic recognition as subspecies ([Fig. 16]).
Fig. 16: Syrrhophus pipilans nebulosus (left, KU 58908) and S. p. pipilans (right, KU 86885). ×2.7.
The parotoid glands attributed to this species by Taylor (1940c:95) are merely the superficial expression of the m. depressor mandibulae and scapula. No true glands are present in the parotoid region.
Syrrhophus pipilans nebulosus Taylor
Syrrhophus nebulosus Taylor, 1943:353-55, pl. 27, figs. 3-5 [Holotype.—FMNH 100095 (formerly EHT-HMS 3774), near Tonolá, Chiapas, México; collected on August 27, 1935, by Hobart M. Smith and Edward H. Taylor]. Smith and Taylor, 1948:49, 51.
Syrrhophus pipilans nebulosus: Duellman, 1958:2-4, 9, 12, 14. Stuart, 1963:32-33. Gorham, 1966:166-67.