18. TESTUDINID.^ 



A carapace 283 mm. in length is much less distinctly 

 marked than the type, but has a rather indistinct black-cen- 

 tered ocellus on each of the last pair of costal scutes. Another 

 273 mm. long, shows no trace of these ocelli, nor are they 

 visible in the other alcoholic specimen, the carapace of which 

 measures 194 mm. 



Remarks. — This turtle is closely related to Pseudemys 

 ornata, but a trinomial is not used here because intergrada- 

 tion has not been shown. 



Distribution. — This turtle is known only from the south- 

 ern portion of the peninsula of Lower California, where it 

 has been collected at Los Dolores, Agua Caliente, and San 

 Jose del Cabo. Mocquard states that it occurs also at San 

 Ignacio, Purissima Jesus Maria, Todas Santos, and Santiago. 

 The specimen collected by Mr. Belding, and recorded by 

 Yarrow as taken at La Paz, was secured at San Jose del 

 Cabo. Mr. Belding notes that this turtle was observed also 

 at Santiago and Miraflores. 



Genus 52. Chrysemys 



Chrysemyi Gray, Cat. Tort., Croc, .Amphis., Brit. Mus., 184+, p. 27 

 (type, ficta). 



The shell is rather narrow, low or moderately high. The 

 plastron is immovably united to the carapace by a broad 

 bridge. The alveolar surface of the upper jaw is rather 

 narrow, especially in front, and the ridge parallel to the cut- 

 ting edge is not well developed. The internal openings of 

 the nostrils are between the eyes. The fingers and toes are 

 fully webbed. The skin on top of the head is not divided 

 into scales. There are two supracaudal plates. The tail is 

 short or moderate. 



