124 HERPETOLOGY OF MICHIGAN. 



County (Thompson, 1911, 6). Specimens from the following locali- 

 ties have been examined: Alma, Gratiot County, Washtenaw 

 County, An Sable River, Crawford County, south branch of Au 

 Sable River, Iosco County, Bessemer, Gogebic County, Walnut 

 Lake, Pontiac and Birmingham, Oakland County, Brighton, Iosco, 

 Livingston County, Denton, Wayne County, Isle Royale, Keweenaw 

 County, Limestone Mountain, Baraga County, Marquette, Mar- 

 quette County, Porcupine Mountains, Ontonagon County, Shelby, 

 Oceana County, Winona, Houghton County, Eaton County, Kent 

 County, Grosse Isle, Wayne County, Douglas Lake, Cheboygan 

 County, Brown Lake, Dickinson County, Charity Island, Saginaw 

 Bay, sand region from Sand Point to Port Austin, Huron County, 

 Cass County, Osceola County, and Dr. A. S. Pearse observed speci- 

 mens in St. Joseph County in the spring of 1909. 



SISTKUKUS CATENATUS (Rafinesque). 



RATTLESNAKE^ MASSAUGER. 



(PI. XI b.) 



Crotalus tergiminiis, Sager, 1839, 302. 



Caudisona tercjiminci, Gibbs, 1900, 12-13, 



>^lstrurus catemitus, Clark, 1902, 191, 1905, 110. Stejneger, 1893, 



413. Ruthven, 1911a, 270-271. Thompson, 1911, 107. 

 ^istrurus catenatus catenatus, Xotestein, 1905, 120. Cope, 1900, 



1146-1149. 

 Crotalophorus tergeminus, Baird and Girard, 1853, 14-15. Smith, 



1879, G. 

 Crotalophorus I'irtlandi, Holbrook, 1842, III, 32. 

 Crotalophorus tergemlnus Idrtlamll, Smith, 1879, 6. Miles, 18C1, 



233. 



Description: A short thick-bodied snake attaining a length of 

 two and one-half or three feet. Head broad and decidedly trianou- 

 lar in shape, being much swollen through the back part, and termi- 

 nating in a blunt snout. Generally a slight concavity in the frontal 

 region. Cephalic plates normal in arrangement, but parietal 

 plates small, which together with the broad head and a rather well 

 defined canthus rostralis makes the area covered by the cephalic 

 plates broadly oval in outline. Sides of head high and without or 

 witli onh' a slight concavity in the loreal region. Eye small, situ- 

 ated high up on head, with an elli])tical pupil, and over-hung by the 

 supraoculars. A deep pit in the loreal region. Temporal region 

 occupied by four or five rows of smooth scales. Tail terminating 

 in a rattle. 



