10 



EINAR LONNBERG 



victs used to hunt them, and as they are not at all shy, they were easy of 

 destruction. Sometimes they may be killed with a stone at a distance of few 

 meters. Like all buzzards they vary immensely in colour; the old females 

 appear to be almost always quite white below and otherwise nearly black. » 



»They appear to feed on the few kinds of vertebrates living on the is- 



Fig. 4. Buteo erythronotus exsul in its natural surroundings on Masafuera. 

 Photo. K. Backstrom. 



land, kids of goat, mice and birds. I have seen them attack young kids left 

 behind and catch petrels, thrushes and Lophortyx. The pellets contained 

 skeletal remains of rats and mice. They fly only at daytime and emit a mo- 

 notonous whistling sound. » 



»Over Masatierra I only saw a few buzzards, which seldom remain more 

 than a couple of days and then return to Masafuera.* (K. B.). 



Fregetta grallaria Vieillot 



Santa Clara (small islet near the western extremity of Masatierra): i $ ^"/i 

 1917. 



Length of wing 157 mm. 



Geographically, this bird ought to be referred to F.. segethi P^iil. & Landb., 

 but according to Mathews the latter ought to have the length of the wing 

 164 — 166 mm., while the same dimension of typical F. grallaria is put to 



