Vor. IIT] VAN DENBURGH AND SLEVIN—ARIZONAN REPTILES 397 
12.—Gopherus agassizii (Cooper) 
Although it has long been known that this turtle is common 
in Arizona, we have found only two definite records of locali- 
ties where it has been taken. Cox mentioned its presence near 
Tucson, and Ditmars records a specimen secured near Phoenix. 
Mr. Herbert Brown sent us a fine large pair from Ehrenburg, 
Yuma County, but these unfortunately were destroyed in the 
great San Francisco fire of April, 1906. Mr. Brown tells us 
that this species is fairly common in the Tortolita and Santa 
Catalina Mountains, in Pima County. 
Our collection includes six specimens. These are one young 
specimen from Yuma; one (No. 13165) taken twenty miles 
west of Tucson, March 9, 1908; a half-grown specimen (No. 
33867) and an adult (No. 33868) from the desert near Tuc- 
son; and two young (Nos. 34263 and 34264) found near the 
steam pump eighteen miles north of Tucson, May 15, 1912. 
13.—Coleonyx variegatus Baird 
We collected fifty specimens of this gecko during the spring 
and summer of 1912. Eleven (Nos. 33491 to 33501) were 
found at Yuma, March 11-19. Three (Nos. 35341 to 35343) 
were secured at Gunsight, Pima Co., April 16-22. Thirty-six 
(Nos. 33890 to 33925) were collected near Tucson, April 8-13. 
At Yuma they were found on the desert under tin cans, old 
clothes, boards, and stones. The Gunsight and Tucson speci- 
mens were found under stones. Near Tucson they seemed to 
live in colonies near the tops of certain low rolling desert hills 
near the lower edge of the giant cactus belt. On some of 
these hills we found six or eight specimens under stones six to 
twenty inches in diameter, while on other similar hills none 
could be found, although nearly every suitable stone was 
turned. Later in the season we could find none, and it is 
probable that they descend into holes as the ground dries and 
the weather becomes warmer. They often utter a little squeak 
when caught. . 
No. 33922, Tucson, March 26, 1912, in life was colored as 
follows: Limbs dark flesh. Dark markings on head; body 
and tail deep liver brown. Light markings on tail and body 
bright lemon yellow, on head grayish yellow. Lower surfaces 
of head, body, and limbs pure white, of tail light lemon yellow. 
