CHECKLIST OF THE AMPHIBIA OF MEXICO 49 



Tyjpe. — Mus. Nat. Berlin No. 6669. 



Type locality. — State of Puebla (probably near Matamoros), Mexico. 

 Range. — Highlands of western Veracruz, Puebla, Morelos, Guerrero, 

 and Oaxaca. 



Genus SYRRHOPHUS Cope 



Syrrhophus Cope, Amer. Nat., vol. 12, 1878, p. 253, 



Malachylodes Cope, Proc, Amer. Philos. Soc, vol. 18, 1879, p. 264 (genotype 



Malachylodes gidtilatus Cope). 

 Syrrhopus Boulenger, Proc. Zool. Soc. London, 1888, pt. 2, p. 206 (emendation 



of Syrrhophus Cope). 

 Syrrhaphus Gunther, Biologia Centrali-Americana, Replilia and Batrachia, 



1900, p. 215 (emendation of Syrrhophus Cope). 



Genotype. — Syrrhophus marnockii Cope. 



Range. — Southern Texas and Colima southward presumably to 

 Peril. 



Species. — Twenty-two are described, of which 12 occur in Mexico. 



KEY TO MEXICAN SPECIES OF SYRRHOPHUS 



1. Two palmar tubercles, outer absent 2 



Three palmar tubercles, outer present 5 



2. None of the digits widened at tips or only minutely so; purplish or 



brownish with red spots; 22.5 mm rubrimaculata (p. 50) 



Outer digits of hand and foot widened at tip 3 



3. Digits rather sharply truncate at tip; interorbital width twice width of 



eyelid; sides as well as dorsum and venter smooth; yellowish brown or 

 brownish gray with a broken dark lateral mark and dark spots on 



back; 21 mm modestus (p. 50) 



Digit tips not sharply truncate but somewhat rounded, the terminal pads 

 better developed; sides areolate; dorsum variable; venter smooth 4 



4. Diameter of tympanum (vertical) a little more than half eye; the lower 



rim distinctly elevated, the upper part of rim hidden; choanae not 



concealed; skin smooth above; 31 mm pipilans (p. 50) 



Diameter of tympanum about one-third eye, the lower rim not notice- 

 ably raised; skin of back with flattened pustules; light lavender above 

 with a nebulous pattern; white or cream below; 25 mm_ nebulosus (p. 51) 



5. Digits not or but very slightly widened at tip 6 



Digit tips definitely widened (1>^ to more than 2>2 narrowest digital 



width) .' 8 



6. Venter and dorsum shining smooth; larger forms ' 



Venter more or less roughened, granular or areolate; a vestige of web 



between toes; smaller form; eyelid width, 1% in interorbital width; 

 heel to posterior part of eye; above vinaceous-drab to brownish drab 

 with sharply defined, blue-black spots; femur barred with rufous; 

 22 mm guttilatus (p. 51) 



7. No vestige of web on toes; parotoid apparently absent; tympanuni sub- 



circular, more than half eye diameter, width of eyelid four-fifths inter- 

 orbital width; heel to the tympanum (in adult) ; sides somewhat areo- 

 late: ash gray, with dark flecks above; 33 mm smith! (p. 51) 



