56 BULLETIN 194, UNITED STATES NATIONAL MUSEUM 



KEY TO MEXICAN SPECIES OP LEPTODACTYLUS 



1. A strongly defined ventral dermal disk; toes lacking lateral dermal fringes; 



males with a prominent shelflike projection on snout; skin smooth 

 without horn-tipped tubercles scattered over body; males lacking black, 

 horny spines onfirstfinger; white below; a white stripe on lip..labialis (p. 56) 

 No strongly defined ventral dermal disk; toes with strong lateral dermal 

 fringes; males with 2 heavy horny spines on first finger, and without 

 shelf from snout; lip without a white stripe 2 



2. Posttympanic gland elongate, with a free-rounded posterior; these as well 



as axillary and postfemoral glands producing a horny excretion at least 

 during a part of the year; digital spines of males closer together; 



smaller occidentalis (p. 56) 



Posttympanic gland ill defined; the axillary and postfemoral glands, if 

 present, diffuse, all not forming horny excretions; digital spines more 

 separated; larger species (composite) melanonotus (p. 57) 



LEPTODACTYLUS LABIALIS (Cope) 



Cystignathus labialis Cope, Proc. Amer. Philos. Soc, vol. 17, 1877, p. 90. 

 Leptodadylus labialis Brocchi, Mission scientifique au Mexique et dans I'Amfir- 



ique centrale, pt. 3, sect. 2, livr. 1, 1881, p. 20, pi. 5, fig. 1. — Gaige, Carnegie 



Inst. Washington Publ. No. 457, 1936, p. 281. 

 Cystignathus fragilis Brocchi, Bull. Soc. Philom. Paris, ser. 7, vol. 1, 1877, p. 182 



(Tehuantepec, Mexico; Mus. Hist. Nat. Paris No. 1952). 

 [Cystignathus] gracilis Cope, Proc. Amer. Philos. Soc, vol. 18, 1879, p. 269-270 



(nee Cystignathus gracilis Dum6ril and Bibron). 

 Leptodadylus albilabris GtJNTHER, Biologia Centrali-Americana, Reptilia and 



Batrachia, 1900, p. 213 (nee L. albilabris Giinther, 1859). — Kellogg, U. S. 



Nat. Mus. Bull. 160, 1932, pp. 82, 83-88 (part). 



T?/:pe.— (Cotypes) U.S.N.M. Nos. 31300-31305. 



Type locality. — ^"Probably a part of Sumichrast's Mexican Collec- 

 tion." 



Range. — Texas south to Nicaragua, Oaxaca, and Guerrero. In 

 Mexico it occurs in Tamaulipas, Nuevo Le6n, Veracruz, Morelos, 

 Guerrero, Oaxaca, Chiapas, Tabasco, Yucatdn, and Campeche. 



LEPTODACTYLUS OCCIDENTALIS Taylor 28 



Leptodadylus occidentalis Taylor, Trans. Kansas Acad. Sci., vol. 39, 1936 (1937), 

 pp. 347-352, pi. 1, figs. 1, 2, 7. 



Type.— EHT-HMS No. 3322. 

 Type locality. — Tepic, Nayarit, Mexico. 



Range. — Sonora to Nayarit. Known from the type locality, Ma- 

 zatldn, Sinatoa, and Alamos, Sonora. 



28 Validity questioned by Bogert and Oliver, Bull. Amer. Mus. Nat. Hist., vol. 83, 1945, pp. 342-343, who 

 synonymize it with L. melanonotus. The latter species needs careful revision. We are certain of the dis- 

 tinctness of occidentalis among Mexican populations and accordingly list it here. The other populations of 

 melanonotus appear extremely heterogeneous, and, of course, comparisons of any one population, however 

 distinct, with all others, cannot be very impressive, as Bogert and Oliver have observed. 



