_Parus atricapillus_, LINN. Syst. Nat. I, 1766, 341 (based on _Parus atricapillus canadensis_, BRISSON, III, 553, tab. xxix, fig. 1).—BAIRD, Birds N. Am. 1858, 390; Review, 80.—SCLATER, Catal. 1861, 13, no. 80.—DALL & BANNISTER (Alaska).—SAMUELS, 182. _Pœcile atricapilla_, BON. Consp. 1850, 230. _Parus palustris_, NUTT. Man. I, 1832, 79. Figured by AUDUBON, WILSON, etc. SP. CHAR. Second quill as long as the secondaries. Tail very slightly rounded; lateral feathers about .10 shorter than middle. Back brownish-ashy. Top of head and throat black, sides of head between them white. Beneath whitish; brownish-white on the sides. Sides of outer tail-feathers, some of primaries, and secondaries conspicuously margined with white. Length, 5.00; wing, 2.50; tail, 2.50. HAB. Eastern North America, north of 39th parallel. In this species the first quill is spurious; the fourth quill is longest; the fifth and sixth successively a little shorter; the third is about equal to, or a little shorter than, the eighth; the second is a very little longer than the secondaries. The tail is a little rounded, the innermost feather longest, the rest successively a little shorter. The greatest difference in length of tail-feathers amounts to .30 of an inch. [Illustration: PLATE VII. 1. Parus atricapillus, _Linn._ ♂ N. York, 12851. 2. “ _var._ septentrionalis, _Harris_. Mission Valley. 3. “ _var._ occidentalis, _Baird_. Washington Territory. 4. “ carolinensis, _Aud._ ♂ D. C., 706. 5. “ montanus, _Gambel_. Nevada, 53456. 6. “ rufescens, _Towns._ Pacific coast, 45946. 7. “ hudsonicus, _Forst._ N. Scotia. 8. Psaltriparus melanotis, _Bon._ Mexico. 9. “ minimus, _Towns._ Cal., 22417. 10. “ _var._ plumbeus, _Baird_. Arizona. 11. Auriparus flaviceps, _Sund._ 42210.]