Amphibians and Reptiles of Mexico. 309 



in tlie pools, and an immature specimen that had biit recently 

 emerged from tlie tadpole stag-e was found on tlie shores of a 

 temporary pond on La Laja Creek, August 14. The note is a low 

 chirp that is repeated regularly at intervals of one second. 



Bnfo vaUiceps Wiegmann. 



Common at Cuatotolapam. 



Bufo valUceps, unlike B. mar i uns, is a toad of tlie fields and 

 woods and is not found commonly about the Settlements. We found 

 the adults in the densest jungle, in the more open woods and in 

 one instance under a log- on the shore of a pond on the savannah, 

 The woods seems to be the prefered habitat of the adults. They 

 mostly lay their eggs in the ponds in the woods, but they also conie 

 out on the savannah or into the cleared or partially cleared areas 

 to lay their eggs in the temporary ponds. Most of the young 

 specimens obtained were taken about the temporary ponds in a low 

 partially cleared area along the margin of the jungle, and on the 

 flood piain of the San Juan River. 



Bufo niarinus (Linnaeus). 



Very common both at Cuatotolapam and Lake Catemaco. 



The large series of specimens obtained exhibit few diiferences 

 from the descriptions that merit notice. Li the large individuals 

 the dark dorsal blotches are very obscure or wanting and the pale 

 vertebral stripe is obsolete. In the young the former are black and 

 conspicuous, and the vertebral line is very distinct. In many of 

 the large specimens the belly is w^ashed with pale red (28d) or 

 orange red (5Bd) in life. This color fades quickly in alcohol. The 

 largest specimen measures 170,5 mm. 



B. marinus may be considered the common toad of the region. 

 Like B. americanus in northeastern North America, it is found in 

 numbers about human habitations '), Coming out at night to feed 

 about the lights. It was very common about the towns on the 

 Hacienda de Cuatotolapam and in the pueblo of Catemaco. Twa 

 specimens were found under logs on the margin of a prairie pool, 

 and numerous young that had but recently completed metamor- 

 phosis were found in the pools on low partially cleared land along 



1) As noted by COPE, in: Journ. Acad. nat. Sc. Pliiladelpliia, 1875^ 

 19L 



