ZooL— Vol. II.] LOOMIS— CALIFORNIA WATER BIRDS. 305 



the region between May and September.^ It is not known 

 to breed above the equator, although occurring as far north 

 as the seas of Kamtschatka and Alaska.^ 



The Greater and Pink-footed Shearwaters may also be 

 visitors from antipodal regions. So far as I am aware, their 

 nesting habitat remains undiscovered, but both occur, dur- 

 ing the warmer months, south of the Tropic of Capricorn.^ 

 As in the Greater Shearwaters on the North Atlantic (Col- 

 lins, 1. c), the sexual organs of all the Pink-footed Shear- 

 waters (twenty-two in number) obtained at Monterey in 

 May and June, 1897, showed no seasonal enlargement, but 

 the ovary of a female in high feather, taken November 10, 

 1896, was enlarged as in a bird of the nuptial period. As 

 a rule, however, the autumn specimens did not exhibit any 

 marked erotic development. 



The following should, perhaps, be reckoned as migrants 

 having fly-lines which ordinarily do not reach far north of 

 the equator: Slender-billed Fulmar, Buller's Shearwater, 

 Black-tailed Shearwater, Pintado Petrel.^ 



Migration from Subtropics and Tropics. — The southward 

 movements of the Black- vented Shearwaters, referred to at 

 length in the foregoing 'Calendar' and in the second paper 

 of the series, are believed to be migratory movements to 

 breeding grounds, and not mere local wanderings in search 

 of food. This view of the matter appears to be sustained 

 by the following facts: — 



I. The flights of Black-vented Shearwaters were similar 

 in character to those of the Dark-bodied. Also, the former 

 species was observed traveling in company with the latter, 



1 Montgomery, 'Ibis,' 7th Ser., Vol. IV, p. 210. 



- Ridgway, Man. N. A. Birds, p. 62. 



ssalvin. Cat. Birds Brit. Mus., Vol. XXV, pp. 374, 377. 



Since the above was penned, I have learned from 'Fauna Chilensis ' (p. 737) that 

 Puffintis creatop7is breeds on Mas-a-tierra (Juan Fernandez). 



* There are other Tubinares occurring north as well as south of the line (as Puffimis 

 carneipes) which also may be only visitors from austral zones, and not breeders in both 

 hemispheres like Pelagodroina jnarina. (Cf. Cat. Birds Brit. Mus., Vol. XXV, p. 386; Hist. 

 Birds N. Z., 2nd Kd., Vol. II, p. 234, ibid., p. 248; Ogilvie-Grant, 'Ibis,' 7th Sen, Vol. II, p. 

 51.) Even in this latter species there possibly may be interhemisphere migration, 

 southern birds visiting the Northern Hemisphere while northern ones are breeding, 

 and northern birds visiting the Southern Hemisphere while southern ones are breeding. 

 See Calif. W. B. No. II, p. 11, foot-note. 



