411 



it occurs. It is usually found near water. A male, 51 mm. long, 

 was found on June 6 sitting on 44 eggs under leaves on a hillside 

 by Loomis and Shannon. They were left until June 12, when 

 both frog and eggs were collected. One egg was dissected and the 

 Uttle frog began jumping around as soon as removed. (The col- 

 lector's field notes are with specimens in the United States 

 National Museum.) 



Eleutherodactylus longirostris (Boulenger). 



This is much rarer on the Island than is fitzingeri and appar- 

 ently not so restricted to the neighborhood of water. I have 

 about 4 records as against 17 of fitzingeri. 



Eleutherodactylus cerasinus (Cope). 



One specimen from Gatun is in the Michigan collection. It is 

 very common in Costa Rica. 



Eleutherodactylus ventrimarmoratus (Boulenger). 



This has been seen from the Rio Chenillo. Its status and that 

 of cerasinus is somewhat uncertain in the region. 



Eleutherodactylus ockendeni (Boulenger). 



Not uncommon in drier and higher localities on the Island. 

 There are about 11 records. Closely related to both cerasinus 

 and to ventrimarmoratus. 



Eleutherodactylus lutosus molinoi (Barbour). 



This tiny frog is not at all rare on the Island. It ranges in 

 color from almost as dark as typical Costa Rican lutosus, to as 

 Ught as the type of molinoi. The absence of the tympanum is 

 amply distinctive. 



Eleutherodactylus diastema (Cope). 



Probably the commonest frog on the Island and certainly the 

 noisiest. Its clear whistle has been heard from Nov. 12, to Dec. 

 25, on Feb. 9, and from July 15 to Aug. 2. This is the 'Hyla 

 chica^ of Noble, and the 'Syrrhopus ineptus^ of Barbour, as well 

 as the 'Hylodes gularis' of Boulenger. It is the only Eleuthero- 

 dactylus of the region to have a well developed gular sac, and is 

 the only vociferous species. It is allied only to E. hylaeformis of 

 the Pico Blanco on the Panama-Costa Rica border, and to E. 

 varleyi of Cuba. 



