Uca. musica. Rathb. 
Drawn by J. Caldwell from specimens obtained by Caldwell and Miss W. Durant 
at Balboa mud flats during the summer of 1920. This is the first record of a fiddler 
crab in our region. The male is shown with the large claw. Sometimes the large 
claw was on the right, sometimes on the left. Specimens brought to the laboratory in 
moist sand made their burrows and lived all summer. In spite of the larger claws of 
the males they gave way to the females when in each other’s way. 
