AMPHIBIANS AND RKPTILKS OF THE DOUGLAS LAKE 



(MICHIGAN) REGION. 



MAX M. ELLIS, UNIVERSITY OK COLORADO. 



Introduction. 



The Douglas Lake region as here designated ineiudes portions of both 

 Emmet and Cheboygan Counties, Michigan, lying between 84° 30' and 

 ?,V 40' \\. and 45° 30' and 45° 40' N. This area is in the extreme 

 northern part of the southern peninsula of Michigan although still an 

 interior unit, 15 to 20 miles inland from Lake Michigan on the west, 

 the Straits of oSIackinac on the nortli and Lake Huron on the east. In 

 general this part of the state is covered with glacial deposits and the 

 soil is very sandy. The terrestrial vegetation includes a large amount 

 of aspen and associated plants in the cut-over and burned-over areas 

 formerly occupied by forest, some virgin forest and some second-growth 

 forest. In the immediate vicinity of streams, lakes and bogs are various 

 transitional series of plants connecting the terrestrial and aquatic plant 

 associations. 



The collections on which this report is based were made during the 

 months of July and August, 1913 to 1916 inclusive. A representative 

 series of the species found has been deposited in the Museum of the 

 University of Colorado. The records of species taken in the vicinity 

 of Cecil, Emmet County, on the shore of Lake Michigan, have been 

 added to the annotated list. 



ANNOTATED LIST. 



Of the 24 species recorded in the following annotated list, six have 

 not been reported previously from the Douglas Lake region. These six 

 species are Hyla pickeringii, Eumeces quinquilineatus , Storeria occi- 

 pHomaculata, Thamnophis sanritu.s-, Chelydra serpentina and Terrapene 

 Carolina. P'ourteen of the other 18 species were listed from the Douglas 

 Lake region by Ruthven (1911 b, p. 115) and the remaining four species, 

 together with tlic 14 reported by Ruthven (I.e.), were recorded by 

 Ruthven, Thompson and Thompson (1912). 



I9th Mich. Acad. Sci. Kept., 1911 



