Vou. III] VAN DENBURGH AND SLEVIN—ARIZONAN REPTILES 399 
1912. Five were secured at Papago Wells in southeastern 
Yuma Co., April 16-22, 1912. One (No. 17283) was caught 
in Paradise Valley, Maricopa Co., May 9, 1910. No. 34320 
was found at the steam pump eighteen miles north of Tucson, 
May 18, 1912. One was seen chasing a Callisaurus on the 
desert. 
In eight specimens the femoral pores vary from 19 to 25; 
being 19 three times, 20 twice, 21 once, 22 four times, 23 
three times, 24 twice, and 25 once. 
18.—Uma notata Baird 
Our present collection contains only one Uma. This is No. 
20812, and was collected near Yuma, June 13, 1910. We 
failed to find any here in March and in September, 1912, al- 
though careful search was made on the same sand hills where 
Mr. Carlson shot more than forty for us in 1905. These 
specimens secured by Mr. Carlson were destroyed in the great 
San Francisco fire of April, 1906. It is probable that there is 
only one species of Uma. We were unable to find this lizard 
near Tucson. 
19.—Holbrookia maculata approximans Baird 
Twenty-seven Arizonan specimens are at hand, collected at 
Tucson, April 16—Sept. 3, 1912; Fairbank, August 12, 1912; 
Cave Creek in the Chiricahua Mountains, Cochise Co., August 
6, 1912; and on the desert near the mouths of Ramsey and 
Carr Canyons, Huachuca Mts., Cochise Co., June 28—July 
29, 1912. This Holbrookia was found always on the ground 
out on the open desert, while the other species secured fre- 
quents canyons and hillsides, and is usually seen on top of 
large stones or boulders. 
Femoral pores in twenty-five specimens vary from eight to 
sixteen; being 8 twice, 10 seven times, 11 four times, 12 ten 
times, 13 fourteen times, 14 seven times, 15 three times, 16 
twice. 
20.—Holbrookia texana (Troschel) 
This Holbrookia was recorded as Arizonan on the evidence 
of a single specimen collected by Mr. Price in 1894. We now 
have at hand forty-five specimens of various ages. Thirty- 
four were secured in the Catalina Mountains, where they were 
