no. 2078. REPTILES OF NORTHWESTERN NEVADA— RICHARDSON. 415 



Description. — Like Uta stansburiana Baird and Girard, but with 

 larger and more heavily carinated and acutely pointed dorsal scales. 

 The number of scales in a line from the interparietal plate on the head 

 to a point on the back above the posterior surfaces of the thighs varies 

 in 111 specimens from 78 to 103; average, 86.5. (See table, p. 418.) 

 The general size is larger than that of Uta stansburiana, especially in 

 the ratio of the hind leg to the length from snout to anus (see table, 

 p. 418) and in the tail length. The tail length in 6 males from the 

 Colorado River, Arizona and California, ranges from 92.5 mm. to 

 104.5 mm.; average, 98.3 mm. In 8 females from the same region 

 the minimum length is 71.5 mm., the maximum 81.5 mm., the aver- 

 age 76.2 mm.; longer than in any typical Uta stansburiana examined. 

 The femoral pores average 14+ on each thigh, a larger average 

 number than is possessed by Uta stansburiana. 



Occasional specimens from localities along the Colorado River, 

 California and Arizona, have small, rather weakly-keeled dorsal scales, 

 which in this respect resemble true Uta stansburiana. In the coast 

 region of southern California and probably also in the western part 

 of the San Joaquin Valley, California, elegans freely intergrades with 

 another form,, which will here be described. 



UTA STANSBURIANA HESPERIS, new subspecies. 



Diagnosis. — Resembles Uta stansburiana elegans (Yarrow) in size 

 of body and in the character of the squamation, but the dorsal scales 

 are smaller. 



Type. — Male, No. 892, University of California Museum of Verte- 

 brate Zoology. From Arroyo Seco Canyon, near Pasadena, Los 

 Angeles County, California, August 3, 1903. Collector, J. Grinnell. 



Description of type. — Head from snout to posterior border of inter- 

 parietal plate slightly longer than wide; nostrils separated by five 

 small plates ; there are four large supraoculars completely surrounded 

 by smaller scales, those on the outer margin largest; the interparietal 

 is the largest of the plates on the head and exceeds the four supra- 

 oculars in dimensions; a long, keeled subocular on each side, fol- 

 lowed posteriorly by two smaller ones; ear denticulations of 3 pointed 

 scales, the uppermost largest, separated from an anterior group of 

 enlarged granules by two rows of smaller ones. Dorsum covered with 

 small imbricate scales, largest along the median region and decreasing 

 rather abruptly laterally; for about one head length back of the inter- 

 parietal plate the dorsals are small, rounded, and unkeeled, then they 

 become larger, keeled, and weakly spinose, gradually increasing in 

 size till they blend quite insensibly into the large, strongly keeled, 



