The eggs of Brewer’s Blackbird are the admiration of oölogists. Ranging in color from clear greenish gray with scattered markings thru denser patterns to nearly uniform umber and chocolate, they are the natural favorites of “series” hunters. The range of variation is, indeed, curious, but it proves to be entirely individual and casual without trace of local or constant differences. Eggs from the same nest are usually uniform in coloration, but even here there is notable diversity. In some instances, after three or four eggs are laid, the pigment gives out, and the remainder of the set is lighter colored. Again, single eggs are heavily pigmented half way, and finished with a clear green ground-color. Fresh eggs may be taken in the Yakima country during the last week in April, and in one case noted, deposition began on April 14th; but May 1st-15th is the usual rule there and elsewhere. Five eggs is the common set, but six to a clutch is not rare. Of twenty-eight nests examined in Yakima County, May 4, 1906, eleven contained six eggs each; while, of something over two hundred seen altogether, two nests contained seven each. [Illustration: _Taken in Stevens County._ _Photo by the Author._ GROUND NEST OF BREWER BLACKBIRD.] It is in his notes that the Brewer Blackbird betrays his affinities best of all. The melodiously squeaking chatter of mating time is, of course, most like that of the Rusty Blackbird (_S. carolinus_), but it lacks the bubbling character. He has then the swelling note of the Grackles proper, _fff-weet_, the latter part rendered with something of a trill, the former merely as an aspirate; and the whole accompanied by expansion of body, slight lifting of wings, and partial spreading of tail. This note is uttered not only during the courting season, but on the occasion of excitement of any kind. _Kooreé_ has a fine metallic quality which promptly links it to the _Keyring_ note of the Redwing. _Chup_ is the ordinary note of distrust and alarm, or of stern inquiry, as when the bird-man is caught fingering the forbidden ovals. A harsh low rattle, or rolling note, is also used when the birds are squabbling among themselves, or fighting for position. Unquestionably this species has gradually extended its range within the borders of the State, for the earlier investigators did not regard it as resident on Puget Sound. It has profited greatly and deservedly by the spread of settlement everywhere, and this is especially true of the more open situations. Not a little it owes, also, to the introduction of cattle; for it is as great a rustler about corrals and stamping grounds as its renegade cousin, the Cowbird. No. 17. BULLOCK’S ORIOLE. A. O. U. No. 508. Icterus bullockii (Swainson).