loG Annals of thk Carnegie Museum. 



Alveolar surface broad. Graptcmys. 



Alveolar surface narrow. Clemmys. 



A A. Plastron hinged ; freely movable ; closes the opening of carapace 



almost entirely. Terrapene. 



Genus Chrysemys Gray. 



30. Chrysemys margitiata Agassiz. Pond-turtle. 



Common in all of the ponds ; also found in some of the creeks 

 which have deep water in them at intervals. It lays six or eight eggs 

 in the soft earth on the banks of the ponds during June. This turtle 

 in captivity readily eats meat and insects. The length of the plastron 

 is sometimes eight inches. 



Genus Graptemys Agassiz. 



31. Grapfemys geographica {'Le ?)Vit\xr). Map-turtle. 



This species is rare in Allegheny County. A small specimen was 

 taken on the bank. of the Allegheny River at Verona, August 17, 1898. 

 At Erie this was one of the commonest turtles found on the peninsula. 



Genus Clemmys Wagler. 



Key to Local Species of Clemmys. 



Carapace smooth ; dark colored, with small yellow spots distributed more or less 



plentifully over it. giittatus. 



Carapace rough, with fine concentric lines on each epidermal plate. inscidptus. 



32. Clenvnys giiffatiis (Schneider). Speckled turtle. 



Mr. J. L. Graf and the writer took three specimens of this species 

 in a small swamp near Claremont early in April, 1900. This swamp 

 is dry during a large part of the summer, which would indicate ter- 

 restrial habits on the part of this species at certain seasons of the year. 

 Another specimen was collected at Elizabeth during July, 1900. 

 This specimen is in the Museum collection. It was swimming in the 

 shallow water of a small pond when first seen. 



33. Clemmys insculptus (Le Conte). Sculptured turtle. 



This species has been taken on two occasions, near Natrona, by Mr. 

 J. A. Shafer. One of these specimens is in the Museum collection. 

 These are the only records of the occurrence of this species in Alle- 

 gheny County. Mr. S. N. Rhoads collected two specimens in West- 

 moreland County. 



