dusky; lores and sub-orbital region like the superciliary stripe; auriculars pale brownish like the crown, bordered along the upper and lower edge with a dusky narrow stripe. Beneath white, slightly tinged with ashy on the flanks; sides of the throat, whole breast, sides, and flanks, with narrow streaks of sandy-brown, more blackish toward the shaft; abdomen, crissum, and lining of the wing, immaculate; throat with a few minute specks, but along each side bordered by a “bridle” of suffused streaks.
♂. (Collector’s No. 1,744, Ipswich, Mass. Dec. 4, 1868; C. J. Maynard.) Wing, 3.25; tail, 2.60; culmen, .45; tarsus, .95; middle toe, .80; hind claw, .40.
♀. (Collector’s No. 6,245, Ipswich, Oct. 15, 1871; C. J. M.) Wing, 2.90; tail, 2.40; culmen, .50; tarsus, .85; middle toe, .65; hind claw, .30.
(Collector’s No. 6,224, Ipswich, Oct. 14, 1871; C. J. M.) Wing, 3.00; tail, 2.30; culmen, .50; tarsus, .85; middle toe, .60; hind claw, .30.
The specimens described above were at first supposed to be Centronyx bairdi, having several points of resemblance to that species, a comparison with the type in Professor Baird’s collection at first failing to establish a difference, as it was in faded and much worn summer plumage, while the Massachusetts specimens were in perfect, blended fall dress, so that a satisfactory comparison was almost impossible. A more recent examination, however, with the advantage of two additional specimens of the Massachusetts bird, has fully convinced Mr. Maynard that his specimens are not Centronyx bairdi, and that, indeed, they are referrible in all respects to the genus Passerculus.
In carefully examining the type of Centronyx bairdi, it is seen that its characteristic features are the following: Outstretched feet reaching beyond the end of the tail; hind claw as long as its digit, and much curved;—whereas in Mr. Maynard’s specimens the outstretched feet reach to only about the middle of the tail, while the hind claw is much shorter than its digit, and only slightly curved. With a wing .10 to .45 of an inch longer, they have the tarsus not any longer, and proportionally more slender. In coloration they are still more different. The most striking feature in C. bairdi is a broad and very conspicuous median stripe of ochraceous-buff on the crown, bordered on each side by an aggregation of black streaks, which form the predominating color of the lateral stripes; of this median stripe there is scarcely any trace in the specimens under consideration, while the crown generally is grayish-brown, with small dusky streaks; C. bairdi has broad, conspicuous, black stripes on the back, while P. princeps has obsolete sandy-brown ones; in C. bairdi there are only a few small streaks of black across the jugulum and along the sides and flanks, while in P. princeps the whole breast, as well as the sides and flanks, are thickly streaked with broader marks of sandy-brown.
In point of coloration, as well as in the feet, there is in reality a much closer resemblance to Passerculus rostratus; but in this the very different bill and different arrangement of markings are sufficient distinctive characters.
Upon the whole, therefore, there can be little doubt that the present birds are well entitled to the name which Mr. Maynard has given them; for after
making all possible allowance for seasonal differences in coloration, we have found it impossible to reconcile them with the C. bairdi.
In this species there is a slight superficial resemblance to Poocætes gramineus; but upon comparison it will be found to be entirely different: thus, P. gramineus lacks the median light stripe on the crown, has the lesser wing-coverts rufous and the lateral tail-feathers white, while the streaks are all blackish and the ground-color different; the generic details, too, are quite different.