528 University of California Publications in Zoology [Vol. 12 



dividuals, being light coral red in some and brick red in one, which 

 latter also has the sides of the head, the horns, and the tail sprinkled 

 with light red. The underparts are pure white, or else spotted with 

 from 60 to 70 black dots. Red in the dorsal coloration occurs in both 

 males and females. The total length of the longest specimen, a male, 

 is 137 millimeters, and the tail length is 52 millimeters. Another male 

 measures 122 millimeters in total length and has a tail length of 48 

 millimeters. 



Desert horned-toads about the Turtle Mountains are occasionally 

 seen in the sandy wash-bed and low-plain environments. They seem 

 to be less frequent on the rocky mesas, and are wholly absent on the 

 hillsides. Their activity in the hot season appears to be restricted to 

 the morning and afternoon hours. When alarmed they often retreat 

 to the shelter of an Atriplex or other low-growing bush, dodging about, 

 when pursued, on the ground beneath the thickly matted lower 

 branches (see Richardson, 1915, p. 423). One was found on an open 

 mesa after sunset, appressed to a small brown piece of lava and ap- 

 parently asleep. This individual was dark gray when discovered, but 

 became very light in color the next day. 



Phrynosoma plat y rhinos seems to be a more agile species than P. 

 blainvillii of the Pacific coast district in southern California. Bryant 

 (1911, p. 16) interestingly describes the burrowing habits of Phryno- 

 soma. 



The examination of the stomach of a preserved specimen revealed 

 four parasitic nematodes, six beetles, one orthopter, many black ants, 

 a leaf, a seed, five pebbles and some gravel and earth. Contents of an- 

 other stomach were: fifteen parasitic nematodes, six Coleoptera, one 

 orthopter, 145 red-headed ants, all apparently of the same species 

 and swallowed whole, and one pebble. 



Xantusia vigilis Baird 

 Desert Night Lizard 



The only specimen found (no. 1101) was taken near Goffs. It has 

 116 transverse and 38 longitudinal scale rows on the back. The fronto- 

 nasals are joined on the median line, the frontal is entire, and the 

 specimen seems identical with examples of vigilis from the western 

 Mohave Desert. There are seven femoral pores on the right thigh. 

 The color above is cream buff to chamois ; slightly lighter below ; faint 



