980 18. TESTUDINIDA 
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 
Chrysemys Gray, Cat. Tort., Croc., Amphis., Brit. Mus., 1844, p. 27 
(type, picta). 
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. 
