409 



Bufo marinus (Linne). 

 It is rare on the island and three have been seen. 



Engystomops pustulosus (Cope). 



While no distinction was made in the field between this and the 

 following species, the fact that, outside of two from the Island in 

 the Michigan collection, all from Panama are pustulosus, makes it 

 reasonable that the following notes refer to this species rather 

 than to ruthveni. It is very common on the Island. 



I have heard it caUing December 10, July 15-August 2. The 

 note may be transUterated as Vheenk' or as *wheu-ak-ak.^ The 

 eggs are laid in a mass of froth, which will float, or which may 

 persist for some time in the absence of water. They are laid 

 rather regardless of the amount of water, from a purely temporary 

 rainfall in a post hole to a pool in a permanent stream. The tad- 

 poles hatch in about 72 hours, the eggs being kept in water. 

 There is some indication of males taking stations and mating 

 with a succession of females. Notes for the monkey cage near 

 the laboratory are as follows: July 18, patch of eggs in post hole; 

 July 24, calling at night in cage and in post hole; (5 specimens 

 taken from cage and vicinity night of July 24 and afternoon of 

 July 25); July 25, mated pair in cage at night; July 26, eggs in 

 cage in morning, another set at night; August 2, afternoon, four 

 males calling in cage. 



Eggs taken from monkey cage (set of night of July 26) hatched 

 in laboratory July 29. The breeding habits of this species have 

 been reported by Noble (1925, Amer. Mus. Nov. 165, p. 2) from 

 notes by Chapin and Breder. 



Engystomops ruthveni (Netting). 



The only Panamanian specimens seen in the collections of 

 Michigan, Harvard, and the National Museum are two from the 

 Island in the Michigan collection no. 61615. 



Leptodactylus labialis (Cope). 

 This has been taken at Fort Sherman and at Majagual. 



Leptodactylus bolivianus Bouienger. 

 This common Pacific-side species has been taken once on the 



