242 



CALIFORNIA ACADEMY OF SCIENCES 



[Proc. 4th Ser. 



Squatarola helvetica 

 Tringoides macularius 

 Dolichonyx orysivorus 

 Hirundo erythrogaster 

 Larus franklini 

 Stercorarius pomatorhinus 

 Symphemia semipalmata 

 Helodromas solitarius 

 Pandion haliaetus 

 Heteropygia bairdi 



Steganopus tricolor 

 Querquedula versicolor 



Black-bellied Plover 



Spotted Sandpiper 



Bobolink 



Barn Swallow 



Franklin's Gull 



Pomarine Jaeger 



Willet 



Solitary Sandpiper 



Osprey 



Baird's Sandpiper 



Wilson's Phalarope 

 Brilliant Teal 



Not common 



Not common 



Not common 



Not common 



A chance visitor 



A chance visitor 



A chance visitor 



A chance visitor 



A chance visitor 



Rare; one taken by 



Harris Expedition 

 Rare; three taken 

 Rare; one said to have 



been taken by Kinberg 



Mr. Gifford states further : "With the exception of Querque- 

 dula versicolor, all of these species occur in the United States. 

 Q. versicolor is a straggler from South America. The others 

 probably occur each year in about the numbers indicated. The 

 Galapagos Islands seem to be out of the general route of migra- 

 tory birds, being too far out to sea." 



Of the twenty birds of Mr. Gifford's list, three are com- 

 mon, five are fairly common, nine are not common, and three 

 are rare. While this list of birds is not large, the number of 

 species of plants that are found on the islands is correspond- 

 ingly small, and when one considers the fact that almost any 

 kind of plant, whether halophytic, xerophytic, or mesophytic, 

 which should happen to be introduced, would find a suitable 

 habitat on some part of many of the islands, it is not unreason- 

 able to suppose that if the islands have been visited pretty con- 

 stantly by a small number of birds for a long time, quite a large 

 number of plants might have been introduced by them. While 

 migratory birds must not be considered as the only factor in 

 distribution, they seem in this instance to be the most important 

 cause, as the presence of many of the plants found on the 

 islands, especially those of a mesophytic character, can be 

 explained in no other way. 



The following table, which has been compiled from various 

 sources, shows the number of species, varieties, and forms in 

 each family that are endemic, and also those which are common 

 to the regions indicated at the heads of the different columns. 



