408 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4TH SER. 
Aug. 12-18, 1912; one from an altitude of 8500 feet on Mt. 
Lemon in the Catalina Mts., June 4 to 17, 1912; forty-six from 
the steam pump in the foothills of the Catalina Mts., eighteen 
miles north of Tucson, May 2-18, 1912; nineteen from Tucson, 
March 31—June 23, 1912; three from Fort Lowell near Tuc- 
son; and one (No: 35286) irom Oak Creek, Coconino) Co: 
Sen 4, WIZ, 
The femoral pores in forty specimens vary from fifteen to 
twenty; being 15 once, 16 eight times, 17 twenty-one times, 18 
thirty-four times, 19 thirteen times, and 20 three times. ‘The 
average of the eighty thighs is 17.7. 
Our series from Tucson and the steam pump include a num- 
ber of very large individuals with the coloration typical of the 
form which has been called C. scalaris. As we have also 
specimens intermediate in size and coloration, it would appear 
that C. scalaris is based upon very old individuals of C. gularts. 
Some young specimens from Fairbank show a distinct 
median dorsal light line. While none of these specimens has 
the nasal in contact with the second labial, this relation is 
found on one side of the head in a specimen with the coloration 
usually seen in young C. gularis. It may possibly be, there- 
fore, that C. arizonae is based upon an abnormal individual of 
C. gularis, which differed from the usual type in coloration, in 
the relations of the nasal and second labial plates, in the num- 
ber of femoral pores, and in the size of the postantebrachial 
plates. 
40.—Cnemidophorus melanostethus (Cope) 
Our collections include one hundred and fifty-nine specimens 
of this lizard. Of these, two were secured at Fairbank, Cochise 
Co., August 12-14, 1912; one from Pima Canyon, Catalina 
Mts., June 7, 1908; seventy-six from near the steam pump in 
the foothills of the Catalina Mts., eighteen miles north of 
Tucson, May 2-18, 1912; six from Tucson, April 24—June 23, 
1912; three from Fort Lowell near Tucson; one from Gun- 
sight, western Pima Co., April 16-22, 1912; and seventy from 
Cave Creek, Maricopa Co., April 1—August 13, 1910. 
The specimen (No. 35340) from Gunsight is a typical one 
with black throat and chest. 
Femoral pores in forty specimens vary from seventeen to 
twenty-four; being 17 six times, 18 eight times, 19 eighteen 
