Ecology ob* iSLe royaLe. 331 



10. Eucalia inconstans (Kirkland). Brook Stickleback. This species 

 was found in the following localities : Tamarack swamps, Siskowit Lake 

 (V. 5) ; Spruce swamp, Siskowit Lake (V. 11) ; Sumner Lake (III. 5). 

 It is probably to be found in most of the ponds and small streams on 

 the island. 



11. Pygosteus pungitiis (Linnaeus). Nine-spined Stickleback. The 

 Nine-spined Stickleback is represented in the collection by specimens 

 from the "Bulrush and Delta zone at the western end of Rock Harbor" 

 (III. 3), and from Tobin Harbor (IV). 



12. Percopsis guttatus Agassiz. Trout Perch. This flsh was taken 

 about a small island in Tobin Harbor (IV. 6). 



13. Perca flavescens (Mitchell). Yellow Perch. Taken in Forbes 

 Lake (II. 5). This species is probably to be found in most of the larger 

 inland lakes as well as in the coves and harbors about the island. It 

 was taken in Washington Harbor in 1904. 



14. Cottus ictalops (Raflnesque). Miller's Thumb. This cottid was 

 found along the shores of Rock Harbor (III. 6) and the island in this 

 harbor (III. 2). As it was found in a similar habitat at the southern 

 end of Isle Royale in 1904, it may be considered to occuir throughout 

 the entire length of the island in this habitat. 



15. Uranidea franklini (Agassiz). There are specimens of this form 

 in the collections, labeled Rock Harbor and Benson Brook (II. 1). 



16. Triglopsis thompsoni Girard. Three specimens of this rare 

 species were taken from the stomachs of Lake Trout (Gristivomer namay- 

 cMis/i) taken by fishermen off the east coast of Isle Royale. Jordan and 

 Evermann write of this form as follows: "Deep waters of the Great 

 Lakes; not common; known from Lake Michigan and Lake Ontario; 

 doubtless a relic of a former arctic marine fauna, and descended from a 

 species of Onocottus." Bojlman (1890, p. 225) records a specimen from 

 Torch Lake, Michigan, which was also found in the stomach of a Lake 

 Trout. 



17. Lota maculosa (Le Sueur). Lake Lawyer; Burbot. Taken in 

 Tobin Harbor (IV. 5) and Rock Harbor (III). 



AmpMMa. 



1. Necturus maculosus (Raflnesque). Three immature amphibians 

 that are undoubtedly this species were taken in Benson Brook. They 

 are very young and lack the dorsal fln and stripes. Dr. L. Stejneger, who 

 has kindly examined these specimens for us, states that the limbs and 

 gills are proportionately shorter than the smallest in the U. S. National 

 Museum. It should be noted here that Yarrow (1888, p. 144) has pre- 

 viously recorded this species from the island. 



2. Bufo americantts (LeConte). Common Toad. The capture of a 

 number of specimens of this species on the northern part (II) estab- 

 lishes its occurrence throughout the length of the island. 



3. Hyla pickeringi (Storer). Pickering's Tree-frog. This amphibian 

 was taken in the woods on the northern end of the island (IV. 8), and 

 in the woods (V. 4) and Tamarack swamps (V. 5) in the vicinity of 

 Siskowit Lake. It probably occurs also on the southern end of the 

 island, although it was not taken by the 1904 expedition. 



4. Rana septentrionalis Baird. Mink Frog ; Northern Frog. A single 

 specimen of B. septentrionalis was secured at Sumner Lake (III. 5). 

 This establishes the presence of the species on Isle Royale, a point that 



