REPTILES. 143 



''Like Graptemys, the broods are sometimes belated in hatching, 

 so that a forced hibernation of embryos results. Many just-hatched 

 young were found during the months of May and June." 



Range: The species has been reported from: Michigan (Sager, 

 1839, 301; Agassiz, 1857, 439; Miles, 1861, 233), Ann Arbor (Smith, 

 1879, 7), Eaton County (Clark, 1902, 193), Porcupine Mountains, 

 Ontonagon County (Ruthven, 1901, 191), Ann Arbor, Marquette, 

 Olivet, Porcupine Mountains (Clark, 1905, 110), Stony and North 

 Islands and Sand Point, Pigeon River, Rush Lake, Huron County 

 (Ruthven, 1911a, 271), Marquette, Porcupine Mountains, Ontonagon 

 County (Ruthven, 1906, 112), Douglas Lake, Cheboygan County 

 (Ruthven, 1911, 115), Cass County (Thompson, 1911, 107), Walnut 

 Lake, Oakland County (Hankinson, 1908, 236-237). The northern 

 peninsula records probably all refer to C. helUi and are not re- 

 corded on tliB map. The writer has seen specimens from Washtenaw 

 Oceana County, St. Joseph County, Monroe and Douglas Lakes, 

 Cheboygan County, Cass County, Alma, Gratiot County, Stony and 

 North Islands, Sand I*oint, Pigeon River at Caseville, and Rush 

 Lake, Huron County, Allegan County, Kalamazoo County, Calhoun 

 County, and Mr. N. A. Wood observed specimens on Charity Island 

 in 1910. 



CHKYSEMYS BELLII Gray. 



BELLAS TURTLE. 



Chnjsemys hellii, Ruthven, 1909, 117. 

 Clirysemys marginata li^eUn, Ruthven, 1910, 59. 

 Chrysemys margimata, Ruthven, 1904a, 191; 1906, 34-112. 



Description: Structural characters as in C. cinerea from which 

 it differs in attaining a somewhat larger size (large individuals 

 reaching a length of six to eight inches as compared with five to 

 six inches in cinerea) and in color markings. The ^^ellow borders 

 to the dorsal shields are generally narrow or wanting but are 

 occasionally as wide as in cinerea. Costal and vertebral scutes 

 marked with faint, irregular light lines. The prominent markings 

 on the marginals are: above; a median and two lateral pale vertical 

 bands, the median continued on the lower surface and there ex- 

 tended on the outer and inner margins to restrict the intervening 

 black area to a spot with a pale center. These markings may be 

 yellow or red. The dusky markings on the plastron alwaj^s form a 

 much larger blotch than in C. cinerea (Figs. 50-51). This blotch 

 covers a large part of the plastral surface and send out extensions 

 along the sutures. 



