120 PAEUS — p. ATEICAPILLUS SEPTENTRIONALIS 



Plumage lax, without decided changes with age or season. 

 Size medium. Nest excavated. Eggs spotted. 

 This genus has developed a greater number of species than 



Fig. 20. — A typical Parus {P. atricapUluB). 



any other of the family, and may, be considered in one sense 

 the typical expression of the whole parine group. There aref 

 five or six American species, two of which, perfectly distinct 

 from each other, inhabit the Colorado Basin. 



liOiig^-tailed Chickadee 



Parns atricapillas septentrionalis 



Parus atrlcaplUus, in part, of some authors.— Mazm. J. f. O. vi. 1858, 119. 



Paras septentrionaUS, Harris, Pr. Phlla. Acad. 11. 1845, 300 (Upper Missouri River). — Bri. 



Stansb. Rep. GSL. 1852, 316— Ctosg. 111. 1853, 17, 80, pi. U.—Bd. BNA. 18158, 389.— Sc(. 



Cat. AB. 1861, U.—Hayd. Tr. Am. Philos. Soc. xii. 1862, 164.— Btak. Ibis, iv. 1862, 5 



(Saskatchewan).- BiuA. Ibis, v. 1863, 67 (British America).- Bd. Rev. 1864, 19.—0)Hoy, 



Smiths. Eep. for 1864, 1865, 438 (Missouri).— Coop. Am. Nat. iii. 1869, H.—Ooues, Am. 



Nat. V. 1871, 369.— 51M!. U. S. Geol. Surv. Terr, for 1870, 1871, iU.— Aiken, Pr. Bo»t. 



Soc. xvi. 1872, 195 (Colorado) .-Men-. U. S. Geol. Surv. Terr, for 1872, 1873, 713. 

 lophopbanes septenrlonallB, Bd. Stansb. Rep. GSL. 1852, 332. 

 Parus atricapUlus var. septentrionalis, Alkn, Bull. MCZ. iii. 1872, lH.—Ooues, Key, 1872, 



i\.— Allen, Am. Nat. vi. 1872, 39S.—Ridg. Bull. Ess. Inst. v. 1873, 179.— Coaes, BNW. 



1874, 21, Wa.— Allen, Pr. Host. Soc. xvii. 1874, 49 B. B. if R. NAB. i. 1874, 99, pi. 7, f. 



2.—Yarr. <& Hensh. Rep. Cm. Specs. 1874, T.—Henah. Eep. Om. Specs. 1874, 41, 72.— 



Allen, Pr. Bost. Soc. xvii. 1874, i^.—Nels. Pr. Bost. Soc. xvii. 1875, 339 (Utah).- flensA. 



Zool. Expl. W. 100 Merid. 1876, 171. 

 Parus septentrionalis var. albescens, Bd. BNA. 1858, p. xxxvii.— Coop. Am. Nat. iii. 1869,299. 

 Parns albescens. Coop. Am. Nat. ill. 1869, 74. 



Hab. — Eegion of the Missouri to the RocUy Mountains and south in Alpine 

 districts to New Mexico. 



Ch. sp. — 3 9 Dorso ocliraceo-ciiiereo,gastrceo ochraceo-albo; alis 

 cauddquefuscis, late albo-Umbatis; lateribus capitis et colli niveis, 

 veriice, nucha guldque nigris. Cauda alts longiore. 



$ 2 : Dorsal region ashy, with an oohraceous tinge, especially on the rump ; 

 under parts white, with an ochraceoiis tinge. Wings and tail fuscous, very 



