144 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



probably other more barren islands. The subspecies maculata also has a 

 rufous phase — the so-called B. brunnescens — which thus far has been re- 

 corded from Cuba and the Pearl Islands only. That this is merely a phase of 

 plumage is abundantly shown by the Pearl Islands series. 



B. virescens anthonyi Mearns is certainly larger than B. virescens virescefis, 

 but how much its alleged paler color is due to season and to bleaching in its 

 arid habitat remains to be proved. Young individuals, however, seem to have 

 more white in the wing feathers. The two specimens upon which Butorides 

 virescens frazari (Brewster) was based were killed in February, and appear to 

 be in full winter plumage, and we cannot help predicting that a careful study 

 of specimens killed at all seasons of the year will show that this is the name 

 of the western bird, and that anthonyi is a synonym of it. 



IBIDIDAE. 



7. Eudocimus albus (Linne). 



Four adults, both sexes, San Miguel and Pacheca Islands, March and April. 

 An egg ready to be laid was taken from the oviduct of a bird killed April 14 

 in Pacheca Island. 



CATHARTIDAE. 



8. Catharistes urubu (Vieill.). 

 One female, Saboga Island, April 12. 



FALCONIDAE. 



9. Polyborus cheriway (Jacq.). 

 Two specimens, ^ and 9) Pacheca Island, April 14. 



10. Milvago chimachima (Vieill.). 



Fourteen specimens, young and adults of both sexes, San Miguel and Saboga 

 Islands, April and March. 



11. Buteo abbreviatus Cab. 

 Two specimens, ^ and 9> San Miguel Island, March 6 and 11. 



12. Rupornis ruficauda (Scl. and Salt.). 

 Four specimens, both sexes, San Miguel Island, February and March. 



13. Urubitinga anthracina (Licnx.). 



Two males, one adult, one young, San Miguel Island, March. These do not 

 differ from mainland specimens. 



