Io 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. Backstrém. 
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): 1 Q °°/1 
1QI7. 
Length of wing 157 mm. 
Geographically, this bird ought to be referred to /. segethz Phil. & Landb., 
but according to MATHEWS the latter ought to have the length of the wing 
164—166 mm., while the same dimension of typical /’. gra//aria is put to 
