1. SULA. 



441 



Bill pale bluish horn ; lores slate-blue, bare space round eyes and 

 gular sac palo yellowish green; legs, feet, and webs lighter in 

 colour and with a yellower tinge (N. S. Ooss). 



Eight examples in the Kothschild Museum, from Jalisco, Mexico, 

 and the Tres Marias Is., measure as follows: — 



ITab. Pacific coast of America and adjacent islands, from the 

 Gulf of California to the Galapagos Islands. 



