Alligator Lizards 21 
lessly for a moment, then made for the nearest shelter, which 
happened to be the same hole. As he reached the entrance, 
the first male ran out and again attacked him. In the ensuing 
struggle both were captured by the observer. The female did 
not reappear. : 
The second pair was maneuvered into a bag and brought 
back to Berkeley without separating them, Copulation took 
place at intervals on the following day. Twenty-six hours an 
possibly more were required for the completion of mating. The 
process was undoubtedly much retarded by the frequent dis- 
er resulting from moving, observing, and photographing 
the 
pee an individual Gerrhonotus does not mate more 
than once a year. Captive males which had mated showed no 
firtier interest in females which were kept with them. A high 
mortality during the breeding season might be expected to re- 
sult from the attacks of predatory animals because of the long 
time required for mating and the indifference of the lizards 
to their surroundings. 
Females containing embryos are found only during the 
months of May, June, and July, and the developing ova grad- 
ually increase in size during this time. The number of eggs 
laid i is probably dependent on the size, age, and condition of the 
emale, Females containing ova have been examined as shown 
in the accompanying table. 
Table showing size igh number of eggs in breeding females of 
G. multi-carinatus examined 
‘a Measurements in millimeters) 
Date No.of Av. size of Head & body igh, 
Locality, in California eggs eggs in mm. of female in mm, 
Lyonsville, 3500 ft., Tehama Co. Apr. 26, 1928 16 2.5 x 2.5 129 
Daly City, San Mateo Co. May _1, 1932 6 9x8 112 
Mt. Diablo, Contra Costa Co. May 17, 1921 12 8 x 6.5 114 
Nortonville Mine, Contra Costa Co. May 21, 1931 11 14x 9 118 
Beegum, 1250 ft., Tehama Co. May 23, 1926 13 13 x 9 132 
Manton, 2300 ft., Tehama Co. May 30, 1926 14 9x8 123 
Berkeley, Alameda Co. June 2, 1915 1 | 4x4 123 
Dale’s Ranch, Tehama Co. June 2, 1924 it 9x9 124 
Manton, 2300 ft., Tehama Co. June 4, 1926 17 10 x 10 140 
Mill Creek, Tehama Co. June 14, 1912 9 14x 9 135 
Rumsey, Yolo Co. June 29,1912 12 16 x 10 144 
Gilroy, Santa Clara Co. June ...., 1910 10 16 x 9.5 ..... 
Vacaville, Solano Co. July 7, 1912 9 15x9 136 
