464 



I!J1!I>S OF THE (iALArjaOS AliC 11 1 rEI.Aa()—UII><: WAY. VOL.XIX. 



SUMMARY. 



Groups of genera. 



Peculiar genera 



Antarctic fjccner a 



Pacific, genera 



Genera j)eciiliar to Nortli America 



Genera of wide or general range 



Genera coniiiiiin to Central America, West Indies, and North America 



Genera common to South America, Central America, West Indies, and North 



America 



Genera common to Central America and Soutli America 



Genera common to South America and West Indies 



Total I 40 



Taking into consideration, however, only those genera wliich have 

 species Ineeding' (or i)i'esnnial)ly breeding) in tlie Gahii)agos Arclii- 

 pelago (whether pecnliar or not), the result is slightly different, as the 

 following will show: 



Groups of genera. 



Peculiar genera 



Antarctic genera 



Pacific genera 



Genera common to Central America, We.st Indies, and North America 



Genera common to South America, Central America, West Indies, and North 



America 



Genera common to < eutral America and South America 



Genera common to South America aud the West Indies 



Genera of wide range 



Total 



!NuiTi- 

 her of 

 genera 



I Per cent 

 of whole 

 nnmlier 

 breeding. 



15.8 

 2.(1 

 2.6 

 2.C 



10.5 

 2.r> 

 2.6 



60.5 



38? 



Restricting the comparison still I'lirther by eliminating all tin' genera 

 of wide range, we are able to get a more definite idea of the relation- 

 ships of the Galapagoa'i avifauna. Thus limited to American types, 

 its composition appears to be as follows: 



Groups of genera. 



Peculiar genera 



Genera common to ('entriil Ami-rica. the West Indies, and North America ... 



Genera common to South America, Central America, the West Indies ami Nortli 



A merica - 



Genera common to Central America and .South America 



Genera common to South America and the West Indies 



Total 



Num- Percent 

 ber of of whole 

 genera, number. 



46. 15 

 7.69 



30.77 

 7.69 

 7.69 



'ihe foregoing analysis shows that a study of the genera alone will 

 not enable us to decide whether the nonpeculiar portion of the (lala 

 l)agoan avifauna is most nearly related to that of the adjacent main 

 land of South America or that of lower Central America or the West 



