Alligator Lizards 33 
Table showing stomach contents of Gerrhonotus c. coeruleus taken at 
Daly City, San Mateo Co., California 
Number of specimens 9 11 9 
Date April 9, 1932 August 14, 1932 August 27, 1932 
Stomach contents 
Coleoptera 24 carabid beetles 8 carabid beetles 27 carabid beetles 
2 weevils 1 silphid beetle 1 grub 
Lepidoptera 3 noctuid moths 
Orthoptera 1 Stenopelmatus 2 small Stenopelmatus 1 grasshopper 
(mandible only) 1 large Stenopelmatus 
(hind leg only) 
1 Ceuthophilus 
e fly 
Diptera 2 eran 24 grasshoppers 
Hymenoptera 1 ichneumon wasp = waspe 
1 smail bee 
Arachnida 3 spiders 4 spiders 
Myriapoda 1 centipede 
Mollusca 1 snail 
on 
where the lizards were taken. The lizards were then con- 
centrating on them, while at other times small beetles formed 
the bulk of their diet. The presence of a single mandible in 
Van Denburgh (1922: 445) records a pair of coeruleus 
found mating April 12, 1909, on Mussel Rock, San Mate 
County. It is probable that the breeding season is limited to 
a brief period at this time of year. On April 10, 1932, two 
individuals, which I had collected at Daly City on the day before, 
were found mating in their cage at 1 p. m. Occasionally the 
female struggled to escape and at such time the male employed 
his prehensile tail in holding her. Copulation began at about 
‘~7 p.m. The female’s body was bent at right angles in the 
th= male held the female’s head. Brief periods of sexual excita- 
tion, during which the male made copulatory movements and 
tapped the sacral region of the female with his hind foot, alter- 
ey with longer quiescent periods. They separated at 
M Dp. “ Eee ; 
