AMPHIBIA AND REPTILIA OF COLORADO II5 



somewhat outlined with black; ventral parts yellow; head greenish 

 above and yellowish below; neck bright yellow. 



Range, Arkansas to Rocky Mountains, north into Colorado. 



Colorado specimens. — Colorado State Historical and Natural History 

 Museum: Lamar, June 20, 1904 (140 mm.), H. G. Smith; State Teachers' College 

 Museum: Baca County, A. E. Beardsley. 



Family Testudinidae 



Pond Turtles and Box Turtles 



This is a large family of turtles of cosmopoHtan distribution. The 

 two genera found in Colorado may be distinguished by the structure 

 of the plastron. 



a. Plastron firm throughout ; carapace rather depressed ; aquatic. 



Chrysemys Gray. 



aa. Plastron with its anterior portion hinged and movable ; carapace elevated 



and rounded; terrestrial Terrapene Mtrrem. 



Genus CHRYSEMYS Gray 

 Chrysemys Gray, Cat. Tortoises, p. 27, 1844. 



We have examined specimens belonging to two species of this genus 

 which were reported as collected in Colorado. Of these two species 

 one, C. belli (Gray), is known to be quite abundant in the ponds and 

 lakes of eastern Colorado. The other stands on the record of one 

 specimen, 240mm., University of Colorado Museiun, labeled, "Den- 

 ver, Colo.," and referable to the species C. elegans (Wied). This 

 species we include only in our key, although since it is known from the 

 Yellowstone region and from Kansas, it is probably found in this state. 

 a. Upper jaw with a small tooth on each side of the median notch. 



C. belli (Gray). 

 aa. Upper jaw without a small tooth on each side of the median notch. 



C. elegans (Wied). 

 y' Chrysemys belli (Gray) 



Bell's Painted Turtle 

 Entys belli Gray, Synopsis Rept ilium, p. 31, 1831. 



Carapace broad, rather depressed, widest in the posterior portion; 

 costals, 4 on each side; neurals, 5; marginals, 25, those in the pos- 



