690 Recently published Ornithological Works. 
critical remarks on the collection are given, but the field- 
notes are reserved for a separate report. The Passeres of 
this far-northern spot are 10 in number, amongst which is a 
Tyrant (Contopus richardsoni) not previously observed so 
far north. 
132. Stone on the Summer-moult of Ducks. 
[The Summer Molting [sac] Plumage of certain Ducks. By Witmer 
Stone. Proc. Nat. Sci. Pkilad. 1899, p. 467.] 
After studying the series of Eider-Ducks obtained by 
Mr. Mcllhenny at Point Barrow, Alaska (see above, p. 689), 
Mr. Stone has come to the conclusion that the “ summer- 
plumage ” assumed by these and other ducks is, in no sense, 
a “ nuptial plumage,” as ct it does not appear until the 
mating season is over,” and is “distinctly a post-nuptial 
dress,” mainly restricted to the head, neck, breast, and 
scapulars : Mr. Stone is of opinion that its use is to render 
the bird inconspicuous during the time when it is moulting 
its flight-feathers and is unable to fly. He proposes to call 
it the “ summer-moulting plumage.” 
133. Van Denburgh on Californian Birds. 
[Notes on some Birds of Santa Olara County, California. By John van 
Denburgh. Proc. Amer. Phil. Soc. xxxviii.,p. 157.] 
This is a local list, accompanied by field-notes, of the 
birds of Santa Clara County, California, based on casual 
observations extending over fourteen years. The Humming¬ 
birds here are Calypte anna and Selasphorus rufus , both of 
them resident and breeding. 
134. Van Kempen on his Collection of Varieties and 
Hybrids. 
[Sur une Serie de Mammiferes et d’Oiseaux presentant des varidtes de 
Coloration, des Cas d’Hybridite et des Anomalies. Par Ch. van Kempen. 
Bull. Soc. Zool. France, 1899, p. 213.] 
Since 1897, when a former list was published, M. Van 
Kempen has added considerably to his collection of colour- 
varieties and hybrids in the classes of Mammals and Birds. 
