1871.] 303 [Brewer. 



Description of the Common Lizard of Socorro. 

 By E. D. Cope. 



Uta aurieulata Cope. 



Scales above minute, except six carinate, dorsal rows, of which 

 the median of each three is larger than the others ; these increase 

 towards the rump and diminish anteriorly. Abdominal scales 

 smooth, in twenty-three rows. A dorso-lateral, dermal line on each 

 side is covered by rounded scales larger than those of the adjacent 

 regions. Two pah supranasal plates ; four internasals, the posterior 

 large as the rest combined, and equal anterior division of the two, 

 into which the prefrontals are divided, "and which lie on each side of 

 it. Frontal transversely divided. Interparietal larger than parietals, 

 a little longer than broad. Temporal region granulated ; a crest of 

 short acute scales on the ridge of the os quadratum above the large 

 tympanum. 



Total length (tail reproduced) 6.90 inches ; end of muzzle to vent, 

 2.90; length of hind foot, .92 inches; muzzle to posterior margin 

 tympanum, .70; width cranium at supratympanic crest, .45 inches. 



Color blue above, with eight pairs of black spots between scapular 

 and crural region, which are more or less connected across the me- 

 dian line. Another series of black spots alternating on the sides. 

 A large black crescent on scapula on each side ; gular region cross- 

 banded with blackish. 



This is the seventh species of this genus now known, which all 

 belong to the Sonoran district, though two of them, U. ornata Bd. ; 

 and U. Stansburiana Bd., Gird., occur in Texas. 



Note. Specimens of the only land mollusk collected at Socorro by Colonel 

 Grayson, were submitted through the Smithsonian Institution to Mr. Thos. 

 Bland, who determined the species to be Ortkalicus undatus Brug. From the 

 note by Col. Grayson on the species found at the Tres Marias, Mr. Bland infers 

 it to be the same as that from Socorro. 



Dr. Brewer said that among the birds from Wisconsin, 

 purchased of Mr. Kumlien, is a species of Empidonax, 

 parent birds with nest and eggs, identified as JEJ. pusiUus by 

 Prof. Baird. This species had not before been seen east of 

 the Rocky Mountains, over one thousand miles west of the 

 locality where it is now found breeding. The differences 



