1895.] Zoology. 757 
In regard to distribution, the author has compiled the following facts : 
T. major is a Gulf species, and ranges from the mouth of the Rio Grande 
to Florida, possibly including southern Georgia. T. baurii belongs to 
the peninsula of Florida, possibly including southern Georgia. T. car- 
olina is found in northeastern United States, extending from the St. 
Lawrence and Great Lakes south to the Carolinas and Tennessee, and 
west to the Mississippi River in Kentucky and to eastern Illinois. Con- 
_ cerning T. mexicana the data are insufficient to outline its range. T. 
triunguis occupies the swampy districts of the Lower Mississippi and 
bordering territory. T. ornata belongs to the plains and tablelands 
east of the Rocky Mts. from the Rio Grande north to the Yellowstone 
River. (Proc. U. S. Natl. Mus. Vol. XVII, 1895). 
Although these box tortoises are similar in external appearance, they 
cannot be referred to asingle genus owing to the extraordinary differ- 
ences in the characters of the zygomatic arch which Baur has shown 
to be present. They furnish an illustration of a case where the generic 
characters are more conspicuous than the specific. Using the table 
furnished by Mr. Taylor, we will have the following : 
I. Three digits to the hind foot. 
Zygomatic arch complete, l Pariemys, g. n. 
Zygomatic arch incomplete, Onychotria Gray. 
II. Four digits to the hind foot. 
Zygomatic arch complete, Toxapsis g. n. 
Zygomatic arch incomplete, Terrapene Merr. 
The only species of Pariemys is P. baurii Taylor. Of Onychotria 
there are two species, O. triunguis and O. mexicana. Of Toxaspis but 
one species is known, viz., T. major; while there are two of Terrapene, 
viz., T. carolina and T. ornata.—E. D. COPE. 
The Genera of Xantusiidæ.—The interesting additions to this 
family of lizards made by Stejneger and Van Denburgh exhibit a large 
range of variation in scutellation of the head. It appears to me that 
neither of the species added by these gentlemen can be properly re- 
ferred to Xantusia, and I would distinguish them as the types of two 
genera. The genera of Xantusiidæ appear to me to be five, distin- 
guished as follows : 
