MICHICAX ACADEMY' Ol" SCIKNCK. 



Table 1. 



South of 

 Saginaw- 

 Grand 

 I, 



me 



Necturiis niaciilo.su.s 



Ambystonia jeffersonianuni 

 Plethodon erythronotus . . 

 Hemidactyliiuu scuta tuni 

 Diemictyliis virideseeiis . . 



Bufo aniericaims 



Hyla versicolor 



Hyla piciieringii 



Acri.s grylliis 



Choroi)hiliis nigritus 



Rana ]ii]iicii.s 



Rana clan)itans 



Rana cantabrigensis 



Rana septentrioiialis 



Rana catesbeaiui 



Total 15 



14 



Saginaw 



Bay 

 Region 



12 



Eumeces quinqullineatus .'. 



Storeria dekayi 



Storeria occipitomaculata 



Heterodon platyrhiiios 



Elaphe vulpinus 



Natrix sipedon 



Liopeltis vernalis 



Diado]iliL.s jJimctata 



Lanipropeltis doliatus triangulus 



Thaninophis sauritus 



Thaninophis butleril . . . .' 



Thaninophis sirtalis 



Si.struru.s catenatus 



Chelydra serpentina 



Chrysemys cinerea 



Chrysemys bellii 



Terrapene Carolina 



Clemmys insculpta 



Total 18 



It can be seen in table 1 that the amphibian and reptilian species have 

 different distributional relations, the amphibia in general, ranging farther 

 north. This grouping of species has been noted in other studies of the 

 distribution of amphibians and reptiles, and Ruthven (1911 a, p. 257) 

 states in discussing the Saginaw Bay fauna that, "in the case of 

 amphibians and reptiles, however, we do not, as in the case of mammals 

 and birds, have many other forms coming into the fauna from the north- 

 ward, and the explanation is that these groups are preeminently tropical 

 and are in this region reaching the outskirts of their range. This is less 



