CuAP. III. GENERA OF CINOSTERNOID^T;. 425 



OzoTiiKCA ODORATA, Ag} This is the most common species of the siil)-fiiinily. 

 Its geographical range is very extensive, extending from New England to South 

 Carolina, Georgia, and Western Florida, and westward to the Mississipjji valley, as 

 far as Missouri and Louisiana. I have specimens from Mobile, from New Orleans, 

 from Tennessee, and from westei'n Missouri, which leave no doubt upon tliis point, 

 and for which I am indebted to Dr. Nott, Dr. Benedict, and Professor Baird. The 

 color varies gi'eatly, from light to dark brown, with or without spots. Major 

 LeConte has described, under the name of Cinosternum guttatum,^ specimens from 

 Pennsylvania, in which the spots are unusually numerous and distinct. T have 

 satisfied myself, however, by a careful comparison of the original specimen which 

 Major LeConte had the kindness to intrust to me for examination, and of many 

 others from the same localit}-, (Upper Darb}', Pennsylvania,) sent me by Prof 

 Baird, and from other localities by Dr. Hallo well, that this is a mere variety of 

 our common Ozotheca odorata. I have found similar specimens in Cambridge, 

 among others that varied from a uniform tint to a more or less dotted surfiice. 

 The young are represented PI. 4, fig. 1-G ; ^ the eggs, PI. 7, fig. 7-9. 



Ozotheca tristycha, Ag. This species is only found in the Western and South- 

 western States. I have many specimens, collected by Mr. G. Stolley, in the 

 Osage River, in Missouri, and in Williamson County in Texas. Prof Baird has 

 sent me four young belonging to the Smithsonian Institution, that were obtained 

 by Dr. C. B. Kennerly, near San Antonio, and two others from the Medina River, 

 in Texas. The young are represented PI. 5, fig. 20-22. Although Ozotheca odo- 

 rata varies greatly, not only in color, but even in outline, I have no doubt that 

 this is a distinct species, characterized, when young, by the great prominence of 

 the keels upon the vertebral and costal plates* and by numerous dark dots between 

 the scales of the sternum, and when adult by a marked difference in the form 

 of the snout. In Ozotheca odorata the snout is much more prominent, on account 

 of the slope of the upper jaw, which extends further back, and is therefore less 

 steep, than in Ozotheca tristycha, the lower jaw of which is broader below the 

 symphysis than in Ozotheca odorata, and suddenly turned up. 



' This s[)eeies lias boon referred to so many gen- N. Am. Ilerp. p. lo.*?, and Uumeril and Bibron, Erp. 



era that it aiipeav-:, in diflerent works, vnider more gen. vol. 2, p. 358.) 



names than any otlier North American Turtle. Its ^ Proceed. Acad. Nat. Sc, Philad., 185 1, p. 185 



oldest name is Testudo odorata, whieli was afterwards and ISO. 



changed to Terrapeno odorata, Cistudo odorata, Ster- ' Tiie figure of a young, two yeai's old, sliows 



notliajrus odoratus, Cinosternum odoratum, Emys how the scales increase only along the anterior and 



odorata, Staurotypus odoratus. Testudo glutinosa, lateral margins, thus tending to give tlieni an iinbri- 



Emj'S glutinosa, Terrapene IJoseii, and Sternotha'rus eated appi-aranee. 

 Boscii are other synonymous names. (Comp. llolbr. ■* Comp. Pi. 4, fig. 1-G, and PI. 5, fig. 20-22. 



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