96 University of California Publications in Zoology [Vol. 27 
and hence had probably hatched out a few days earlier. One collected 
in Bailey Canon, 3000 feet, near Sierra Madre, Los Angeles County, 
on April 4, 1908, is 21 millimeters in length. Three others obtained 
in the San Gabriel Mountains nearby, at 3000 feet, on June 16, 1909, 
are 25, 25, and 31 millimeters, respectively, in length. The breeding 
season of attenuatus in the central and southern parts of the State 
would appear to be about the same. 
One recently hatched young Batrachoseps , from the eggs collected 
at Berkeley, measured as follows : total length 19 mm. ; length of tail 
6 mm. ; width of head 2 mm. ; center of foreleg to center of hind leg 
7 mm. The general coloration was black, with a slight brownish tinge ; 
on the back were four parallel lines of spots silvery white and reddish 
gold in color ; the ventral surface of the body was marked generally 
with scattered patches of silvery white. The costal folds were 17 in 
number, the external nares relatively large and directed anteriorly; 
the naso-labial groove, if present, could not be distinguished. 
One adult collected at Berkeley had two small weevils and several 
small beetle larvae in its stomach. Another, seen under a board, had 
nearly devoured an earthworm. Captive specimens of Batrachoseps 
can be fed successfully with fruit flies {Drosophila ) . 
Eisen (1897; 1900a, b) and Emmel (1920) have used this species 
in cytological and haematological studies. Its small size, and the 
possibility of providing a steady source of food in the form of the 
fruit flies bred successfully for studies in genetics, would suggest 
Batrachoseps as a suitable species to keep on hand, ‘ ‘ domesticated, ” 
in cytological laboratories. This salamander is peculiar in having 
non-nucleated erythrocytes (see Eisen, loc. cit . ; Giglio-Tos, 1899). 
A large series of specimens of Batrachoseps collected near Napa, 
Napa County, December 16, 1912, is available for the study of growth. 
This series, taken at one place and time, ought to indicate any age- 
grouping which might occur in the population. The 87 individuals, 
in condition for satisfactory measurement, were found to group as 
follows : 
Total length in millimeters: 33-40 41-50 51-60 61-70 71-80 81-90 91-98 
Number of specimens 2 1 6 17 31 22 8 
Burke’s specimen grew from a length of 16 millimeters on January 
28 to 35 millimeters by May 22. The latter date marks the approxi- 
mate time of disappearance of Batrachoseps from the ground surface. 
If the animals actually aestivate during the dry season then the 
individuals under 50 millimeters in the tabulation just given would 
