[6]. [See Erratum on p. [64] of this issue.—Edd.]
[7]. These all common on the date when first observed.
[8]. The difference between the season just passed in the arrival and time of nesting of the birds, may be illustrated by the fact that in the spring of 1880, Setophaga ruticilla was noted near Wheatland April 1, while in the spring of 1878, eggs of Protonotaria citrea were obtained near Mt. Carmel April 27.
[9]. Baird, Brewer and Ridgway’s Birds N. Am., Vol. III, p. 45.
[10]. Eremœca = ἔρημος + οἰκέω.
[11]. Mr. Ridgway has found that fully ninety-five per cent of the Screech Owls of the Wabash Valley, in southern Illinois, are red.
[12]. The small quadrate spots on the primaries and the indistinct tail bands, characters which have been held as diagnostic, are both shown by my series to be inconstant and of no varietal significance.
[13]. As my material is not at present sufficiently comprehensive to enable me to define the limits of distribution of this race I leave the compilation of its synonymy to those who may have better opportunities in this respect.
[14]. “Review of the American Species of the genus Scops.” Proc. U. S. Nat. Mus., Vol. I, pp. 85–117.
[15]. This arrangement leaves a large portion of the Middle Province without any characteristic representative, maxwellæ being an Alpine form apparently confined to the Rocky Mountains, while kennicotti and “tricopsis” respectively invade only its northern and southern borders. Our knowledge of the subject is not as yet sufficiently comprehensive to enable me to fill this gap, but all the available evidence goes to show that asio, at least as above defined, is not found to the westward of the Rocky Mountain range.