64 



BULLETIN 160, UNITED STATES NATIONAL MUSEUM 



Range. — From Mazatlan in Sinaloa, Sierra Madre in Zacatecas, and 

 Orizaba in Vera Cruz, south through Nayarit, JaUsco, Guanajuato, 

 Hidalgo, Morelos, Puebla, and Guerrero to the Isthmus of Tehuan- 

 tepec in Oaxaca; exact limits of range not known; occurs in the 

 province of Bocas del Toro in northeastern Panama and in the Andes 

 of Ecuador. Reported from: Vera Cruz, Tetela (Gadow); Sinaloa, 

 Presidio (Giinther); Durango, Milpas (Forrer); Guanajuato, Guana- 

 juato, Huazteca Potosina, and Silao (Duges); Puebla, Izucar de 

 Matamoros (Perez); Guerrero, Omilteme and Chilpancingo (Gadow), 

 Amula (H. H. Smith); Oaxaca, Totolapan (Gadow). 



Remarks. — The original description of Bufo simus is based solely 

 on young toads taken by J. von Warszewiez in shallow places in the 



Chiriqui River near Bo- 

 cas del Toro, Panama. 

 It is assumed that the 

 author refers to rivers or 

 streams descending from 

 the Volcano Chiriqui 

 through the present 

 province of Bocas del 

 Toro and flowing into 

 the lagoon, which is con- 

 nected with the Carib- 

 bean Sea by the so-called 

 Bocas del Toro. It is 

 stated that the cotypes 

 are in the Zoological 

 Museum of Krakow. 

 According to the original 

 description, the body 

 length of the largest 

 individuals (cotypes) is 

 26 mm. There are no bony crests on the crown and on the hinder 

 part of the head. The tympanum is concealed. The parotoid glands 

 are medium sized and irregularly rounded. There is a slight web on 

 the hind foot, but the toes have dermal fringes. The skin on the 

 back is studded with large and small warts, but the skin of the 

 underparts, with the exception of the thighs, is nearly smooth. The 

 coloration of the upperparts is a lighter or darker gray, and that of the 

 underparts yellow-gray with irregular blackish spots. 



It has been generally believed that Bujo simus was closely related 

 to Bufo intermedius, and that it differed from the latter only in having 

 the tympanum hidden under a tubercular skin. Ten young toads 

 belonging to the American Museum of Natural History and collected 

 at or near Orizaba in Vera Cruz were compared with the original 



Figure H. — Heads of Bufo simus: a. Lateral view of specimen 

 (U.S.N.M. No. 2607) from Valley of Mexico, Mexico; -b, dorsal 

 view of same; c, lateral view of specimen (U.S.N.M. No. 47171) 

 fromDolores, Nayarit, Mexico; d, dorsal view of same 



