140 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY, 



every way similar to the type, with the same peculiar skull with its 

 broad, heavy rostrum. 



I give a nominal list of the species of the islands here in order to 

 make tlie paper complete as to the mammals. The species peculiar to 

 the Pearl Islands are marked with an asterisk. 



1. * Marmosa fulviventer Bangs. 



2. Didelphis marsupialis etensis Allen.^ 



3. * Lepus ineiiaius Bangs. 



4. * Basyprocta callida Bangs. 



5. * Loncheres labllis Baug?,. 



6. * Proechimi/s burrus Bangs. 



7. * Zyffodontomi/s seorsus Bangs. 



8. Mus musculus Linne. 



9. Mus rattus rattus Linne. 



10. Mus rattus ale.vandrinus (Geoff.). 



11. Fampi/rops helleri Peters. 



12. Hemiderma hreicaudum (Wied.). 



IV. AvES. By John E. Thayer axd Outram Bangs. 



On his first trip to the Pearl Islands Mr. Brown secured examples 

 of forty-two species of birds, only two of which were North American 

 migrants. On the present expedition he took representatives of ninety- 

 two species. One species taken in 1900 — Agamia agami — was not 

 obtained, and a dove — Zenaida aurirulata — recorded from the Pearl 

 Islands on the strength of a skin supposed to have been taken there by 

 Captain Kellett and Lieutenant Wood, was not met with by Mr. Brown. 



Thus the number of species of birds so far taken in the Pearl Islands 

 is ninety-four, of which thirty-three are North American migrants, and 

 sixty-one resident breeding birds of the islands. 



It is rather strange that this considerable increase in the numbers 

 of resident birds added but one new species, — the Booby, already de- 

 scribed (Bull. M. C. Z., vol. 46, p. 92, June, 1905). All the others, 

 with the possible exception of the rail, which we refer hesitatingly to 

 Aramides cajanea chiricote, prove the same as mainland species. 



The large series collected on the present trip shows one species, 



1 Allen, Bull. Amer. Mus. of Nat. Hist., vol. 16, Aug. 18, 1902, p. 2G2. I fail to 

 see how this form from the continent and the Pearl Islands differs from D. marsu- 

 pialis battyi Thomas, described from Coiba Island (Novit. Zool., vol. 9, p. 137, 

 April, 1902). Dr. Allen, however, keeps them distinct in his review. 



