10. were less than three years old but recent research (Woodward, MS) has indicated that after 15 months, it is impossible to separate the age classes in the field. Confusion of this species with the previous species in the field is unlikely. In all plumages the Red-billed Tropicbird has extensive areas of black in the outer primaries, which the Red-tailed Tropicbird does not have. White-tailed Tropicbird (Phaethon lepturus) Four White-tailed Tropicbirds were seen south of 10°S. Blue-faced Booby (Sula dactylatra) Five individuals of this species were seen, all of which were immatures molting into the first subadult plumage. Sixty percent of the birds were seen at 15°N-119°W. Red-footed Booby (Sulasula) Only two Red-footed Boobies were seen - one at 9°38'N and the other at 5°40'S-118°56'W. Frigatebird (sp.) (Fregata) Only one frigatebird was definitely identified to species - a Great Frigatebird. It is very likely that all frigates were referable to this species. All but one of the individuals were seen south of the equator. The greatest number (see figure 15) of birds was seen at the closest point to the Marquesas, where these birds probably are from. Red Phalarope (Phalaropus fulicarius) About 33% of the identified phalaropes were of this species, although it is very likely that Northern Phalaropes also occurred.