Chap. III. GENERA OF EMYDOID/E. 443 



PI. Til. fig. 7-10. Its yellow dots upon a black ground are very characteristic. 

 When liatched, there is hut a single dot upon each scale of the shield, and 

 none upon the marginal scales; as it advances in age new dots appear, one by 

 one, upon each scale, until they become very irregular, and extend to the margin 

 of the shield. I have, however, seen old specimens that wvve entirely black, and 

 others in Avhich the dots remained few and regular. The sternum varies from 

 black to yellow, with black blotches, especially upon the centres of the scales. This 

 .species is common in New England, and in the middle Atlantic States. It does 

 not extend south of North Carolina, nor west of New York and Pennsylvania. 

 I have received large numbers from North Carolina, through the kindness of 

 Professor Baird, but never noticed it in the South or in the West, 



II. C.VLEMYS, Aff. This genus differs from Nanemys in having a deep notch 

 in front of the upper jaw, with a large tooth on each side, jii'ojecting in the 

 shape of an arched bill. Sides of the head compressed, but not narrowing down- 

 ward. The lower jaw is strongly arched upward.^ 



C.VLEMYS MiJHLE.\UEiiGii, Ai/.' I liavc ucvcr seen the young, or the mature eggs 

 of this species, which seems rather rare, and entirely limited to New Jersey and 

 the eastern parts of Pennsj-lvania. Its scales are either perfectly smooth or 

 concentrically grooved; with or without keel along the back. The dark orange 

 blotch on each side of the neck, extending over the temporal muscles, is charac- 

 teristic of this species. 



III. Glittemys, Aff. The upper jaw projects in the form of a bill, arched down- 

 ward, notched at the tip, and so compressed sidewise that the margin of the 

 mouth is narrower than the top of the forehead over the nose. The edge of 

 the lower jaw is straight, except the tip, which is greatly arched upward. The 

 horny sheath of the horizontal, alveolar surface is narrow in both jaws. The 

 margin of the shield is very thin and spreading in the young, and the surface 

 of the scales is coarsely granular. In the adult they have radiating ridges, 

 which in very old age are sometimes entirely smoothed down. 



Glyptemys insculpt.\, Aff!^ This species is common in the North-eastern Stntes, 

 and is found only as for south as New Jersey. I am indebted to JNIr. S. Ten- 

 ney for hundreds of specimens from Lancastei", Massachusetts. He has also secured 



iimler tlic names of Emys punctat.i and Cleinmys brook, in Iiis X. A. TIcTp. pi. 4, under the name of 



jmnctata. Emys Miihlfiibergii. 



' As 1 have not seen the yonng, I am some- ' This is the Emys inseulpta of Major LeConte. 



wlia! ihiiildl'iil respecting the value of the diller- Diimorii and liibnm have erroneously identified it 



oilces pointed out between this genus and the i)re- with SehoepH"* Testudo pulehella, wiiieh is the young 



ceding. of the Euroi)ean Emys hitnria. Emys speeiosa. 



■i 



This species is urll represented by Dr. IIol- i^t'//, is the smooth variety of the old age. 



