1906. A monograph of the genus _Collocalia_. Proc. Acad. Nat. Sci.
Phila., 58:177-212.
1912. A revision of the forms of the edible-nest swiftlet,
_Collocalia fuciphaga_ (Thumberg). Proc. U. S. Nat. Mus.,
42:11-20.
1915. A synopsis of the races of the crested tern, _Thalasseus
bergii_ (Lichtenstein). Proc. U. S. Nat. Mus., 49:515-526, pl. 66.
1917. The birds of the Anamba Islands. Bull. U. S. Nat. Mus., 98:v
+ 75 pp., 2 pls.
1919. A revision of the subspecies of the white-collared
kingfisher, _Sauropatis chloris_ (Boddaert). Proc. U. S. Nat.
Mus., 55:351-395.