MEXICAN TAILLESS AMPHIBIANS 



199 



tinct broad dark crossbars can be seen on several when the skin is wet. 

 The skin on the back between the dorso-lateral glandular folds, 

 unlike those from the City of Mexico, is distinctly warty. In view 

 of the unsatisfactory condition of these specimens it is obviously diffi- 

 cult to determine their exact relationships, and they are tentatively 

 referred to this species. Besides these larger individuals, there is in 

 the collection one lot of four immature frogs (U.S.N.M. No. 10247) 

 that are unquestionably R. montezumae. All are somewhat faded, 

 and on two and possiblj' on a third this bleaching process has revealed 

 distinct traces of darker spots on the back between the dorso-lateral 

 glandular folds. The darker spots are not visible on the fourth 

 individual and this (No. 81101) has been selected as the electotype 

 for Rana montezumae concolor Cope. 



Specimens examined.— One hundred and six, as follows: 



Rana montezumae 



• Electotype of Rana montei umae eoneolor. 

 ' Type of Rana montezumae- 



' Paratypes of Rana montezumae. 



