332 



MICHIGAN SURVEY, 1908. 



has hitherto been in question, owing to the unidentifiable condition of 

 the specimens taken on the island by Dr. A. E. Foote (see Ruthven 1904, 

 110). Miss Dickerson (1900, 225) writes of the habits of this frog as 

 follows: "The Northern Frog is described as decidedly a river frog; 

 it is never captured in lakes and ponds." Our observations are exactly 

 the reverse, all of the specimens taken on both expeditions having been 

 found about the shores of the inland lakes. 



5. Rana clamitans Daud. (Jreen Frog. As rein'esented by the col- 

 lections of the 1905 expedition, this is the common frog of the island. 

 Numerous specimens were taken on the sliores of Rock Harbor (I. 1), 

 at Sumner Lake (III. 5), and Siskowit Lake (V). Although it was 

 not found on the southern end of the island in 1904, it doubtless occurs 

 there. 



6. Rana sijU-atica canfalrigrnsis (Baird). Northern Wood Frog. This 

 frog is now known from practically the entire length of the island. 

 Specimens were taken by the 1905 expedition at Forbe» Lake (II. 5), 

 the small island in Tobin Harbor (IV. C), and at Siskowit Lake (V. 5). 



Serpentes. 

 1. Storeria occipitoiiiaculata (Storer). Red-bellied Snake. This 

 little snake is the characteristic reptile of Isle Royale. It was taken by 

 the 1905 expedition at Rock Harbor (I. 7 and IV. 5) and Siskowit Lake 

 (V. 5). No notes are available on the habits of the individual specimens 

 obtained, but they are doubtless similar to those noted in 1904. As the 

 variability of the scutellation of this snake has apparently never been 

 determined, I add the scale formulas of the specimens examined. 



* In these specimens there is no decrease in the number of scale rows on the posterior part of the 

 body. (Compare Ruthven, 1908.) 



2. Thamnophis sirtalis (Linnaeus). Garter-snake. Garter-snakes 

 were taken in the following localities: Light-house clearing (I, 7), Ran- 



