Of six specimens from Cascada Tzararacua, five are colored like typical _M. hobartsmithi_, having the anterior and posterior surfaces of the thighs and the upper arms pale pink in life and a grayish brown dorsum in preservative. The other specimen (UMMZ 94231) has in preservative a dark brown dorsolateral line on each side enclosing a pale tan area that extends from the snout to the vent. One specimen from 29 kilometers east of Morelia (UIMNH 40338) and 13 specimens from San José de la Cumbre (UMMZ 102111) do not have the prominent tarsal tubercles characteristic of _M. hobartsmithi_. Also, in these fourteen specimens the palmar tubercles are larger, and the dark anal patch more distinct, than in typical _M. hobartsmithi_. Possibly these specimens, which are from the high mountains in the eastern part of Michoacán, represent another species of _Microbatrachylus_. However, Taylor (1940d:501) reported a series of _M. hobartsmithi_ from the mountains 10 miles west of Villa Victoria in the western part of the state of México. The largest specimen from Michoacán is a gravid female (UIMNH 16104) having a snout-vent length of 23.5 mm. _Microbatrachylus hobartsmithi_ has been found in rocky ravines along streams in the Cordillera Volcánica and the southwestern escarpment of these mountains at elevations from 1450 to 2750 meters. ~Microbatrachylus pygmaeus~ (Taylor) _Eleutherodactylus pygmaeus_ Taylor, Trans. Kansas Acad. Sci., 39:352, 1937.--1 mile north of Rodriguez Clara, Veracruz, México. _Microbatrachylus pygmaeus_ Taylor, Univ. Kansas Sci. Bull., 26:500, November 27, 1940. _Microbatrachylus albolabris_ Taylor, Univ. Kansas Sci. Bull., 26:502, November 27, 1940.--2 miles west of Córdoba, Veracruz, México. _Microbatrachylus minimus_ Taylor, Univ. Kansas Sci. Bull., 26:507, November 27, 1940.--Agua del Obispo, Guerrero, México. _Microbatrachylus imitator_ Taylor, Univ. Kansas Sci. Bull., 28:70, May 15, 1942.--La Esperanza, Chiapas, México. Arteaga (328). This large series (UMMZ 119247-8) was collected on June 22 and 23, 1958, before the onset of the heavy summer rains. The frogs were found in a shaded ravine at the north edge of Arteaga; they were obtained during the day, at which time they were actively moving about in the leaf litter along a small stream.