King, Warren B. 1964 34 Several times today large petrels were seen that appeared mottled on the back as if molting. Both White necked and Dark-rumped have been seen in this state. Some even had secondaries missing. Perhaps study skins will dispel our doubts. At 1140 feeding flock No. 2 appeared - 30 sooties, 2 wedgetails, 3 Harcourts - most unusual - 4 shearwater unidentified and 1 white- necked petrel. At 1212 75+ 10 Sooty Terns were seen circling and feeding. No Shearwater/petrels were seen by me after careful scruting although watch held contrary opinion. Watch was as stubborn as I. At 1555 a non-feeding flock of shearwaters and petrels passed. Two light and one dark Wedgetails, two molting Dark-rumped Petrels, two unidentified Shearwater/petrels and a brown upper and white under petrel-size of a Newell's although chunkies - between Bonins and Dark-rumped size - closer to Bonins. Upper parts uniformly dark brown. This same species seen again at 1640 briefly at close range. It had dark spots around eye - underwing showed thick dark edging and white center. May have had has mark across center of wing. Light colored shafts to primaries showed on dorsal wing surfaces a la Jaeger. I have no really good guesses. It flies differently than Bonins - not as facile on its tight banks. Flaps more too - doesn't hunch shoulders like Bonins. Flies without too much hurry. Masked Booby seen three times today, over hour apart each time. A white-necked Petrel Sundell saw at 1300 apparently miscalculated proximaty to ship and twisted and turned just in front of it, finally soaring to 50 feet circling ship. At 1540 we turned North after finishing a long hydro station at 10° N. At 1635 and again just at sundown had good