76 U. S. p. E. E. EXP. AND SUEVEYS — ROUTE TO CALIFOENIA. 



annually of between one and two hundred thousand dollars. If undisturhed, it lays but a single 

 egg and rears but one bird each season. No nest is prepared, but depositing her egg on the 

 bare rock, ground or any slight ledge, the female, denuding a portion of her breast by plucking 

 out the feathers, sits upright upon it during the period of incubation. Gentle and inoffensive, 

 it is not only harassed by man but also by the gull, its most vigilant and often its worst enemy. 

 I have frequently seen the gulls assemble in large numbers and by raising a great clamor and 

 spreading their wings, endeavor to frighten them away from their trust that they might begin 

 to plunder. I one day saw three gulls approach scientifically a single murre setting on her egg. 

 Two of them feigning an attack in front, the murre raised herself to repel them with her sharp 

 pointed bill, instantly the third advancing from the rear seized her solitary egg from beneath 

 her and flew oif with the booty, the two first immediately following to claim their share. The 

 egg was dropped and broken on the rocks when a general scramble ensued between the three 

 robbers for the valued prize. The egg hunters continue to rob them from May to July, when 

 exhausted nature compels the bird to cease laying. During this period when driven from the 

 rookeries, flying in terror to escape the threatening danger, they dash themselves to pieces 

 against the rocky walls or collecting against them ten or twelve deep, numbers are crushed by 

 the violence of each others' strugglings. At the time of the drive, (as it is called,) these birds 

 all leave the island and settling on the water cover it for a mile around. 



UKIA COLUMBA, Pallas .—Black Guillemot. 



Uria columia, Cabsin, in Baird's Gen. Rep. IX, 912. 



Abundant and resident on the seacoast, breeding in the crevices of the rocks on the 

 Farrallones. 



COLTMBUS GLACIALIS, Linn .—Great Northern Diver or Loon. 



Colymbus glaoialis, Gmel. Syet. Nat. toI. I, part II, p. 588. — Ndtt. Orn. vol. II, p. 513.- — Wils. Am. Orn. vol. IX, 

 p. 84, pi. 74, fig. 3. 



Abundant on the fresh water lakes, where its lugubrious cry is occasionally heard towards 

 evening. 



COLYMBUS SEPTENTKIONALIS, Linn .— Eed-throated Loon. 



Colymhis sepientrimalis, Gmel. Syet. Nat. vol. I, part II, p. 586. — Nutt. Om. vol. II, p. 519. — Aud. B. of A. Oct. 

 vol. VII, p. 299, pi. 478. 



The specimen obtained was shot from the wharf at Newtown, San Diego. 

 PODICEPS CRIST ATUS, L i n n .-Crested Grebe. 



Podic^s cristatm, Aud. B. of A. Oct. vol. VII, p. 308, pi. 474.— Rich. &, Sw. F. Bor. Am. vol. II, p. 410.— Nott, 

 Orn. vol. II, p. 250. 



Abundant. Frequenting the fresh water districts, and observed also at Santa Barbara on the 

 borders of the ocean. 



PODICEPS CALIFOENICUS, H e e r m a n n .—California Grebe. 



Podiceps californkMS, Heermann, Proceed. Ac. Nat. Sc. Phil. vol. VII, p. 



Form. — Size small. Bill slightly slender, curved upwards ; wings short ; first quill of 

 primaries slightly longest ; secondaries short ; tertiaries longer, nearly equal to the primaries ; 

 tarsee flattened ; feet large. 



