ON THE ZOOLOGICAL POSITION OF TEXxVS. 19 



nal postsymphyseal. Scales in twenty-six longitudinal rows. Hind leg 

 2.5 times in length of liead and body, and meeting the fore limbs when 

 both are appressed on the side. 



Color plumbeous above, light olive below. A light band extends 

 along the upper lip to a short distance behind the axilla, and another 

 from the end of the muzzle over the eye to the corresponding point on the 

 side, separated by two longitudinal rows of scales. The total length 

 is m. 170 ; from muzzle to vent .059; do. from muzzle to ear .012. 



This plainly colored seine is intermediate in characters between the U. 

 (mthracinus and the U. tetragrammus of Professor Baird. It has the 

 single postmental plate of that species, but the prefrenal is not high ; 

 there are twenty-six rows of scales, and there are no lateral bands on 

 the body. The superior pair of pale lines are not dark-edged above, and 

 are separated by six rows of scales as in E7. tetragrammus. It was dis- 

 covered by G. W. Marnock near Helotes Creek, on the front line of hills, 

 twenty miles northwest of San Antonio, and was afterwards obtained 

 by Mr. Boll from near Fort Concho. 



Eumeces pachyurus sp. no v. l^o i)ostnasal plate ; anterior lj>real ele- 

 vated, reaching the transverse interfrontonasal i)late. Postloreal as 

 high as or higher than long; two preoculars between fourth and fifth 

 superior labials ; one postsymphyseal ; twenty-six rows of scales ; tail 

 large, nearly as stout as the body at the base, subtetragonal ; legs, 

 small, separated by the length of the anterior limb when apjiressed ; the 

 hind leg a little more than one-fourth the length of the head and body.* 



* Eumeces plnvialis sp. uov., Eumeces (mthracinus vav. Cope,, Proceed. Amer. Pliilos. 

 Soc, 1877, J). 63. This is a Eumeces of the group of the E. aiithraciiius. It lias there- 

 fore live supraorbital jilates, and no postnasal. Its loreals are like those of that 

 species and E. pachynrus, of a rather elevated form, the preuasal reaching the trans- 

 verse interfrontonasal. Tha two preoculars are wedged between the fourth and fifth 

 superior labials, of which the fifth is elongate and beneath the orbit. The scales are 

 in twenty-six rows and the limbs well developed; when laid along the side they over- 

 lap, the fore claws reaching the end of the second toe. Postsymphyseal undivided. 

 Color above, blackish olive; below, malacliito green. Two narrow green lateral 

 bands separated from each other by a black baud two and a half scales wide, the 

 upper ones of opposite sides separated by a width of six scales. There is a faint trace 

 in the typical specimen of a pale vertebral line with a dark border on each side, aud 

 there is a black border above the upi)er lateral line and another below the inferior 

 lateral line. These lines extend to the orbit aud ear respectively. The superior 

 labials are green, black bordered; the other head plates brown with black borders. 



The elevated form of the loreals and undivided j»ostsymphyseal plate ally this 

 species to the E. aiithracinus. The more numerous scales and labial plates, the wide 

 interfrontonasal and different coloration distinguish it. From E. pachyurus its well- 

 developed limbs seijarate it. In E. hremlUieatus the loreal plates are differently formed 

 and the coloration is totally difterent. The size is rather small. But one specimen 

 of this species is known. It was taken near Mobile, Ala., by Dr. Joseph Corson, U. 

 S. A., well known by his important additions to Eocene vertebrate paleontology. 



