58 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4TH SER. 
In closing this brief prefatory note, I desire to make 
acknowledgment of the assistance rendered in the preparation 
of this paper by Mr. Leverett Mills Loomis, Director of the 
Museum of the California Academy of Sciences, and Mr. 
Edward Winslow Gifford, Assistant Curator of the Depart- 
ment of Ornithology. 
1. AXchmophorus occidentalis. WESTERN GREBE.—This spe- 
cies appears after the breeding season and occurs in varying 
numbers through the winter, being common at times. It 
lingers on into May. It prefers the quiet waters of Monterey 
Bay to the open ocean. 
2. Colymbus holbeelli. Hotpa@ri’s Grese—tIn fall and 
winter this grebe is by no means a rare bird on the bay, espe- 
cially in the harbor at Monterey and along the shore to Pacific 
Grove. Specimens obtained in April and early May are in high 
plumage. 
3. Colymbus auritus. HorNnep Grese—The Horned Grebe 
is apparently less abundant on Monterey Bay than its con- 
gener, the Eared Grebe. It is also a later arrival from breeding 
grounds. Some March and April examples approach high 
plumage. 
4. Colymbus nigricollis, Earep Grese—It appears during 
the middle of summer and remains through the winter, loiter- 
ing on into spring. It is apparently the commonest representa- 
tive of the family visiting Monterey Bay. 
5. Podilymbus podiceps. PiEp-BILLED GREBE—The “Didap- 
per’ is apparently only an estray on Monterey Bay in the 
vicinity of Point Pinos. 
6. Gavia immer. Loon.—Of the three loons found in this 
vicinity, this species seems to be the least numerous. How- 
ever, it is tolerably common in the winter season. The earliest 
and latest dates of capture are October 15 and June 15. 
7. Gavia pacifica. Pactric Loon.—Outnumbering all the 
loons, it is truly abundant at times late in autumn, through the 
winter, and in spring. In 1909, two loons, probably of this 
species, were seen as early as August 19. Great numbers pass 
Point Pinos on their way north at the end of May; stragglers 
remain into June. 
8. Gavia stellata. Rep-ruroatep Loon.—Apparently the 
Red-throated Loon arrives from the north about as early as its 
