1856.] 239 



many of the plates (11 or 12,) upon the orbits are much larger than the rest; this 

 difference exists also in the Creek boundary specimens, but is not so well 

 marked; femoral pores very distinct ; these in some of the Creek boundary 

 specimens are very large, (J a line in diameter,) much larger than in any speci- 

 men of'Sceloporus I have seen ; eight eggs quite large, from eight to nine lines in 

 length, were counted in the ovaries of the largest ; in which also the femoral 

 pores were very distinct, so that the femoral pores do not belong exclusively to the 

 male in Crotaphytus ; the stomach which is a large and rounded sac was dis- 

 tended with the debris of grasshoppers and coleopterous insects ; one of the 

 former nearly entire. 



Habitat. Arkansas, Louisiana near the confines of Texas, Western Texas, 

 Kansas. 



The two specimens of Holbrookia maculata (Cophosaurus Troschel) do not 

 differ very materially from the many specimens we have from the Creek and 

 Cherokee countries presented by Dr. Woodhouse ; the marginal plates upon the 

 upper jaw constituting the delicate fluting in that region are more narrow, and 

 the markings upon the back are more regularly disposed, and the white spots are 

 much less Dumcrous than in some of the Creek specimens. The plates upon the 

 head will be found to vary considerably in individual form and arrangement in 

 the latter. 



Habitat. Creek boundary. Western Texas, New Mexico. 



The specimens of rhrynosoma cornutum present nothing remarkable; the 

 abdomen and chin of a young one are spotted all over with black spots, and 

 lines of different shapes. 



Habitat. Arkansas, western country from Missouri to Texas, Creek and Chero- 

 kee countries, Western Texas, Santa Fe, New Mexico, Kansas. 



LACERTIDiE. 



Seven specimens of Cnemidorophous gularis, Baird and Girard. These are 

 distinguished from C. sexlineatus by the broader stripes and larger size of the 

 scales ; the fronto-nasal plates appear also to be comparatively smaller in gularis. 



Habitat. Texas, New Mexico and Kansas. 



SCINCID^. 



Five specimens of Plestiodon obsoletum, B. & G. No two of them are colored 

 precisely alike. They all have a general resemblance, yet each differs from the 

 other. This difference is produced mainly by the greater or less extent to which 

 tbe scales are spotted with black ; in one specimen, the greater part of each 

 scale upon the body being thus spotted; in another, the ground color, which is 

 drab, greatly preponderates ; head brown or olive, marked with dark lines and 

 spots, under parts silvery white. 



Habitat. Borders of Rio San Pedro, Texas, Kansas. 



CHALCIDID^. 



Ophisaurus ventralis, two specimens. 



These present different markings ; they both are drab colored above, with a 

 brown band running from the occiput along the middle of the back to the ex- 

 tremity of the tail ; sides black, with two narrow white vitta;, the upper termi- 

 nating five inches from the extremity of the tail ; the lower on the left side 4 

 inches 2 lines from the anus ; and on the right 1 inch 4 lines ; three white lines 

 upon the tail anteriorly ; two narrow brown bands on each side of the abdo- 

 men. Length of head, neck and body 5j inches ; of tail 1 foot 2 inches. Tbe 

 other specimen is olive above, with a brown band along the middle, but the neck 

 and anterior part of the body is marked with white narrow oeellated spots, and 

 and instead of the lateral vitta there are upon the sides on a black ground, three 

 rows of interrupted white spots, often united so as to form a line with very im- 

 perfect margins ; under surface silvery white ; length of head, neck and body 

 7| inches ; of tail, 1 foot, 5 inches, 4 lines. 



A specimen from Verdigris river resembles the first in its markings; another 



