2 J A Anthony, Avifamia of the Revillagigedo Islands. loct 



be found, from those with pure white lower parts, including underwing 

 coverts, to those having gray and sootj-brovvn plumage. In the upper 

 surface there is very little variation. The species was not breeding to any 

 extent at the time of our visit and but a single egg was secured, which is 

 now in the U. S. National Museum. A more complete paper on the 

 Shearwaters of our soutliAvest coast is contemplated, when the present 

 interesting species will be treated more in detail. 



3. Oceanodroma kaedingi. Kaeding's Petrel. — A number were seen 

 at sea off the island as late as June i. We found no evidence of the nest- 

 ing of small Petrels on any of the islands of the group. It is possibly 

 accounted for by the presence of vast numbers of large land-crabs that 

 inhabit burrows all over the islands and would very likely destroy eggs 

 and 3'oung of such species as Oceanodroma . 



4. Phaethon sethereus. Yellow-billed Tropic Bird. — Common 

 about the cliffs, and at sea, between the islands. They were often seen to 

 enter holes in the ledges, and were usually in pairs, chasing each other 

 about with loud cries that have given them the name of ' Bo-son Bird, 

 the note being a good imitation of a boat-swain's whistle. Many holes 

 were examined but no eggs found. 



5. Sula cyanops. Blue-faced Booby. — Common. At the time of our 

 arrival most of the birds were paired and were defending hollows in the 

 sand Avhere they contemplated laying. Only two or three sets were found 

 of one egg each. 



6. Sula brewsteri. Brewster's Booby.— About as common as the 

 preceding species, nesting at the same time. The nests of this species 

 were all made of sticks and coarse grass in a hollow in the sand or rocks. 

 Fresh eggs were found on May 17, in nests that were unfinished on the 

 first of the month, when we first called at the island. It is interesting to 

 compare in this connection the dates on which Mr. Goss found eggs of 

 this species in the Gulf of California (Auk, Vol. V, 1888, 243). 



7. Sula websteri. Webster's Booby. — By far the most abundant 

 species on the island, nesting in the heavy growth of grass all over the 

 island. Fresh eggs were taken the first of May, and on the 17th the 

 same nests had second sets. A few young were found on the latter date. 

 This species often took the liberty of perching on our heads and shoulders 

 or lit on the rail of the skiff as we pulled ashore. 



8. Fregata aquila. Man-o'-War Bird. — A considerable colony was 

 found on the top of the island and several nests were also found at the 

 base of the cliff near the beach. Young birds were fully fledged, many 

 of them flying on May i, and one or two fresh eggs Avere taken. On our 

 second visit to the island, May 17, four or five sets were taken, evidently 

 a second laying. 



At a considerable distance from the colony a bird was found that was 

 unable to fly, and thinking that it had been recently injured, and must 

 necessarily starve, where food was not easily obtained by even the 

 best of fivers, I killed the cripple and made an examination of its injuries. 



