CHECKLIST OF THE AMPHIBIA OF MEXICO 53 



Type. — Lost {fide Kellogg). 



Type locality. — Near Zacualtipan, Hidalgo, Mexico (1,800 feet 

 lower in rocky gorge of a stream near its junction with the San Miguel 

 River). 



Range. — Known only from the type locality. 



Genus MICROBATRACHYLUS Taylor 



Microbatrachylus Taylor, Univ. Kansas Sci, Bull., vol. 26, 1939 (1940), p. 499. 



Genotype. — Eleutherodactytus hobartsmithi Taylor. 

 Range. — Central Veracruz and Guerrero through Mexico probably 

 to Guatemala and perhaps to Nicaragua. 



Species. — Eight are known at present, all in Mexico. 



KEY TO MEXICAN SPECIES OF MICROBATRACHYLUS 



1. White stripe, black-edged below, on upper jaw; dark median stripe limited 



by irregular dorsal ridges; maximum size, ? , 18 mm albolabris (p. 54) 



No white stripe on upper jaw, or dark median stripe 2 



2. Tibiotarsal articulation to tip of snout or beyond; an outer palmar 



tubercle 3 



Tibiotarsal articulation to ej'e or at most halfway to nostril; an outer 

 palmer tubercle present or absent 4 



3. Minute vomerine teeth; seven more or less distinct dorsal and dorsolateral 



ridges; heel to beyond tip of snout; 20 mm lineatissinius (p. 54) 



No vomerine teeth; dorsal and dorsolateral ridges if present, indistinct, 

 less than 7; heel to tip of snout; 18.1 mm oaxacae (p. 54) 



4. Three palmar tubercles; no parotoid gland evident; outer metatarsal tu- 



bercle two-thirds size of inner; large species; 27 mm., ? . montanus (p. 54) 

 Only two palmar tubercles, outer absent 5 



5. Dorsal ridges absent; well-defined dorsolateral ridges, continuous or 



broken, arising from corners of eyes, converging on end of rump; area 



between, uniform light brown, cream-fawn or whitish 6 



No well-defined dorsolateral ridges limiting a uniform dorsal coloration _ . 7 



6. Dorsal skin covered with fine tubercles; no evidence of a parotoid gland; 



tibiotarsal articulation to middle of eye; color fawn to hght brown, uni- 

 form, with an indistinct, V-shaped blackish mark on occiput; 15 mm., 



cf; 19 mm. ? minimus (p. 54) 



Dorsal skin nearly smooth; a strongly defined parotoid; tibiotarsal artic- 

 ulation halfway to nostril; color clay-white on back; no tubercles on 

 outer edge of tarsus; 14.2 mm., cf; 9 ? imitator (p. 55) 



7. An inverted V-shaped ridge and mark on shoulders; hp spotted black; a 



pair of inguinal black spots; no tubercles on outer edge of tarsus; tips of 

 digits widened; no parotoid; 16 mm., cf ; 19 mm., 9 --- pygmaeus (p. 55) 

 Inverted V-shaped ridge and dark mark sometimes evident in males; no 

 inguinal black spots; tubercles on outer edge of tarsus; tips of digits not 

 or but minutely wider than digits; parotoid gland present; 15.1 mm., cf; 

 22.5 mm., ? hobartsmithi (p. 55) 



