THAYER AND BANGS: PEARL ISLANDS BIRDS. 141 



Ortalis struthopus, described by Bangs as peculiar to the islands, to be 

 the mainland form, Ortalis cinereiceps. 



Two new subspecies are described in the following list, — one a tyrant, 

 of which Mr. Brown had previously taken but one example, and another, 

 the blue tanager of the islands, which ditiers sufficiently from the main- 

 land form to be considered a subspecies. 



Unfortunatel}' very little can be noted as to the habits of the birds. 

 Mr. Brown states that in the islands, heavily forested right to high- 

 water mark, the smaller birds all live in much the same manner, except 

 that some keep to the underbrush and others to the trees, and that fre- 

 quently one does not know what bird one has shot until it is secured. 



In the following list North American migrants are marked with an 

 asterisk, measurements are in millimetres, and the colors are according 

 to Ridgway's nomenclature. 



PHALACROCORACIDAE. 



1. Phalacrocorax vigua vigua (Vieill.). 



Sixteen specimens, adults and youiig, San Miguel and Saboga Islands, 

 March and April. A nest placed in a tree containing six incubated eggs was 

 taken, April 14, in Saboga Island. 



SULIDAE. 



2. Sula etesiaca Thayer and Bangs. 



Seventeen specimens, adults of both sexes and young, San Miguel and 

 Saboga Islands, March and April. No nests were found, the breeding season 

 being apparently over. 



FREGATIDAE. 



3. Pregata aquila (Linne). 



Three adults, ^ ^ and 9 , Sun Miguel and Saboga. A number of eggs were 

 also taken. 



ARDEIDAE 

 4. Nyctanassa violacea (Linne). 



Twelve specimens, adults and young, San Miguel and Saboga, March and 

 April. A nest containing two fresh eggs was taken from a tree in San Miguel, 

 March 14. 



