HERPETOLOGICAL COLLEiCTION FROM MEXICO SHANNiON 469 



formula of nigrum will be of doubtful significance until further 

 specimens come to light. 



Absorption of the major portion of the branchial rays and of the 

 tail fin presents the probability that these salamanders metamorphose 

 in this region. 



The three subspecies of Ambystoma rosaceum are physiographically 

 well differentiated. A. r. rosacemn is found in the Apachian biotic 

 province (Smith, 1939) in the easternmost hills of the Sierra Madre 

 Occidental near the Plateau. The northern Mexican portion of the 

 Sierra Madre is divided into two longitudinal sections by a central 

 lowland drainage. Whereas r. rosaceum occurs in the easternmost 

 portion of the eastern division, r. sonoraensis occurs in the western 

 portion of the western division, which is located in the Arizonan biotic 

 province. The type locality of r. nigrum is in the mountains of the 

 Durangan biotic province, which is less distinctly separated from the 

 mountains farther north by a northwest-southeast drainage system. 

 The type localities oi A.r. nigrum and A. r. sonoraensis are separated 

 by a linear distance of more than 500 miles of mountainous terrain. 



Genus BOLITOGLOSSA Dumeril and Bibron 



BOLITOGLOSSA OCCIDENTALIS Taylor 



BoUtoglossa occidentalis Taylor, Univ. Kansas Sci. Bull., vol. 27, pp. 145-147, 

 fig. 1, C, pi. 9, figs. 1-4, 1941. 



University of Illinois Museum of Natural History No. 3200, collected 

 at Pichucalco, Chiapas, during the summer of 1937, by Clarence 

 Goodnight. 



This salamander has been taken previously only on the Pacific 

 slopes of Chiapas. Pichucalco is on the Tabasco border, and this 

 record extends the range of the species across the state, and undoubt- 

 edly into Tabasco. 



Genus BUFO Laurenti 

 BUFO COCCIFER Cope 



Bufo coccifcr Cope, Proc. Acad. Sci. Nat. Sci. Philadelphia, vol. 18, pp. 130, 131, 

 1866. 



Chicago Museum of Natural History No. 38756, one specimen, a 

 female, from 10 miles east of Apatzingan, Michoacan, collected by 

 F. A. Shannon, July 22, 1941, under a rock in water-saturated ground 

 bordering a small temporary pond. 



The toad, a mature female, represents a state record and a consid- 

 erable eastward extension of the range of the species. Additional 

 specimens will probably lead to a disclosure of subspecific differences, 

 at least of color. 



