-ECOLOGY OF NORTHERN MICHIGAN. 107 



THE COLD-BLOODED VERTEBRATES OF THE PORCUPINE MOUN- 

 TAINS AND ISLE ROYALE, MICHIGAN. 



A. G. RUTHVEX. 



The list of fish in the following report is entirely the result of the work of 

 this expedition, and we are indebted to Dr/S. E. Meek of the Field 

 Columbian Museum, Chicago, for the identification of the specimens. 



The list of amphibians and reptiles is intended to include the data at present 

 available to the author on the occurrence of these animals in the Northern 

 Peninsula. It is of necessity far from complete, as very little collecting 

 has been done in this region, and the records that have been made are scat- 

 tered. For the latter reason it was thought best to bring together all 

 available information. The sources of the records are the collections made 

 for Mr. Bryant Walker about Limestone Mountain, Baraga County, and 

 in the Porcupine Mountains, Ontonagon County, in the summer of 1903*; 

 the collections and field notes of the Museum Expedition in the Porcupine 

 Mountains and on Isle Royale, during the summer of 1904; records and col- 

 lections made about Marquette by Dr. E. R. Downing of the Northern State 

 Normal School, and specimens in the University Museum collected by Dr. 

 A. E. Foote on Isle Royale. A few notes have also been added from specimens 

 collected during the summer of 1905, b}' Dr. C. A. Davis of the Michigan 

 Geological Survey. 



The amphibians, with the exception of the Marquette specimens, have 

 been identified by Dr. Stejneger of the United States National Museum; 

 the Marquette specimens, and the reptiles were identified by the writer, 

 unless otherwise stated. 



1. FISH FROM THE PORCUPINE MOUNTAINS. 



1. Catostomus commersonii (Lacepede). Fine Scaled or Common Sucker. 

 IV. 1. Ten specimens were taken in the deeper holes in Carp river near 

 Carp Lake, July 16, on' a bottom of fine mud. V. 3. Twelve specimens 

 were collected near the center of Carp Lake on July 16. VII. 1. One was taken 

 and several others seen off the edge of the delta of Little Carp river, August 

 3. VII. 3. Two specimens were collected in a pool about five feet deep 

 behind a beaver dam on Little Carp river, August 3. This is the charac- 

 teristic and common fish in the deeper waters of this region. 



2. Semotilus atromaculatus (Mitchell). Horned Dace. IV. 1. Thirteen 

 specimens w r ere taken in Carp river on July 16 and 18. This fish seemed 

 to occur only in small numbers in the deeper water near the lake, but farther 

 up stream, where the current is more rapid, it was very abundant, although 

 the bottom w^as still composed of mud and debris. No specimens were 



'taken' in Carp Lake, but it is abundant in Little Carp Lake, VII. 1, where 



*Ruthven, A. G. Notes on the Molluscs, Reptiles and Amphibians of Ontonagon County, Michigan. 

 Sixth Annual Report Michigan Academy of Science, pp. 188-192. 



