-7- birds, where the "typical" forked tail and "typical" divided rump of Leach's were not evident because of molt or badly shot birds, the color of the oil (uropygial) gland was found to be a reliable character to separate these two species. Leach's have a creamy-white oil gland, that of the Galapagos is a dark grey. Any combination of the two or more races and the two species were encountered together in the field. Most specimens were collected over artificial oil slicks made with Wesson and/or cod liver oil. Throughout these oil slick operations I had the opportunity to test an old suspicion that storm petrels are able to detect an oil slick by smell. The evidence gathered during the present cruise strongly suggests this and a note concerning details of this phen- omon is being prepared for publication. Identification of stomach remains in storm petrels is practically a lost cause because the majority of food is small, soft-bodied and quickly becomes unidentifiable through digestive action. In a few specimens of Leach's, however, the remains of squid were plainly identifiable. One stomach contained the outer coat and "pen" of a squid which was estimated to be ca. six inches long in life. It is doubtful whether storm petrels are large or ferocious enough to catch such a live animal and I presume wounded animals are probably taken over feeding orgies of tuna. One Leach's had copepod remains in the stomach. White-throated Storm Petrel 3 (Nesofregetta albigularis) All three individuals were sighted south of the South Equatorial Current. Black Storm Petrel 11 (Loomelania melania) All sightings were made on 22 and 23 February of ship followers across the mouth of the Gulf of California. Fork-tailed Petrel 1 (Oceanodroma furcata) The single sighting was noted with Black Storm Petrels following in the ship's wake on 22 February at the mouth of the Gulf of California. Red-billed Tropicbird 14 (Phaethon aethereus) This is predominantly a coastal species. All sightings were along the Mexican mainland. One specimen was collected. Red-tailed Tropicbird 21 (Phaethon rubricauda) Scattered sightings were made from near 20°S to 15°N, but all occurred along the western leg of the cruise. Five birds, mostly immatures, were collected. White-tailed Tropicbird 2 (Phaethon lepturus) Two individuals circled the ship near 20°S on 13 February. These probably are from one of the southern islands; Easter or Sala y Gomez.