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4. Distribution of Laysan Albatross 9 



5. Distribution of Dark-rumped Petrel 10 



6a. Distribution of Juan Fernandez and White-necked Petrels, May- 

 September 1964 12 



6b. Distribution of Juan Fernandez and White-necked Petrels, October 



1964 to January 1965 14 



7a. Distribution of Black-winged Petrel, April-July 1964 16 



7b. Distribution of Black-winged Petrel, September-December 1964 18 



8. Distribution of Kermadec Petrel 20 



9. Distribution of Herald Petrel 21 



10a. Distribution of Bulwer's Petrel, March-June 1964 22 



10b. Distribution of Bulwer's Petrel, July and September 1964 24 



11a. Distribution of Wedge-tailed Shearwater, March-June 1964. Lines 



mark the approximate separation between light-phase (open circle) 



and dark-phase (solid circle) birds 26 



lib. Distribution of Wedge-tailed Shearwater, July-November 1964. 

 Lines mark the approximate separation between light-phase (open 



circle) and dark-phase (solid circle) birds 28 



lie. Distribution of Wedge-tailed Shearwater, December 1964 to March 

 1965. Lines mark the approximate separation between light-phase 



(open circle) and dark-phase (solid circle) birds 30 



lid. Distribution of Wedge-tailed Shearwater, April-June 1965. Lines 

 mark the approximate separation between light-phase (open circle) 



and dark-phase (solid circle) birds 32 



12. Monthly abundance of Wedge-tailed Shearwaters: total--solid line; 

 dark-phase--broken line 34 



13. Distribution of Christmas Shearwater 35 



14a. Distribution of Newell's Shearwater, March-June 1964 36 



14b. Distribution of Newell's Shearwater, July-November 1964 38 



15a. Distribution of Leach's Storm Petrel, September 1964 to January 



1965 40 



15b. Distribution of Leach's Storm Petrel, February-May 1965 42 



16. Distribution of White-tailed Tropicbird 44 



17. Distribution of Red-tailed Tropicbird 45 



18. Distribution of Blue-faced Booby 45 



19. Distribution of Brown Booby 46 



20. Distribution of Red-footed Booby 47 



21. Distribution of Pomarine Jaeger, spring migration months and 

 winter months 49 



22a. Distribution of Sooty Tern, March-June 1964 50 



22b. Distribution of Sooty Tern, July-November 1964 52 



22c. Distribution of Sooty Tern, December 1964 to March 1965 54 



22d. Distribution of Sooty Tern, April-June 1965 56 



23. Monthly abundance of northern and southern populations of Sooty 

 Terns 58 



24. Distribution of White Tern 59 



25. Monthly abundance of species groups in birds per hour of observation 62 



26a. Relative composition of avifauna by species group, March-September 



1964. Numbers in parentheses in each sector indicate the percent- 

 ages of total birds in each category 65 



