98 



U. S. p. K. B. EXP. AND SURVEYS — ZOOLOGY — GENERAL REPORT, 



Comparative measurements of species. 



PICOIDES ARCTICUS. 



Black Backed Three-toed Woodpecker. 



Picus {.Ipternus) nrclicw, Sw. F. Bor. Am. II, 1831,313. 



^pternus arcticus, Bp. List, 1838. — In. Consp. 1850, 139. — Newbefrt, Zool. Cal. and Greg. Route, 91 ; Rep. 



P. R. R. Surv. VI, 1857. 

 Picus arclicus, Aud. Syn. 1839, 182.— Ib. Birds Amer. IV, 1842, 266; pi. 268.— Nuttall, Man. I, 2d ed , 



1840, 691. 

 Picus tridactylus, Bon. Am. Dm. II, 1828, 14 ; pl.xiv, f. 2.— Aud. Cm. Biog. II, 1834, 198 ; pi. 132. 



Sp. Ch. — Above entirely uniform glossy bluish black ; a square patch on the middle of the crown, saSron yellow, and a 

 kv/ white spots on the outer edges of both webs of the primary and secondary quills. Beneath white, on the sides of tho 

 breast longitudinally striped, and on tho sides of the belly and on the flanks and tibial region banded transyersely with black. 

 A narrow concealed white line from the eye a short distance backwards, and a white stripe from the extreme forehead (meet- 

 ing anteriorly) under the eye, and down the sides of the neck. Bristly feathers of the base of tho bill brown. Exposed 

 portion of two outer tail feathers (1st and 2d) white. 



L ength, about 9J inches ; wing, 5 ; tail, 3.85. Female, without yellow on tho head. 



Hub. — Northern portions of the United States to the Arctic regions, from the Atlantic to the Pacific. 



This species differs from the other American three-toed woodpeckers chiefly in having the 

 hack entirely hlack. The white line from the eye is usually almost imperceptible, if not 

 wanting entirely. 



List of specimens. 



PICOIUES HIRSUTUS. 



Banded Three-toed Woodpecker. 



Picui /lirju/us, Vikill. Ois. Am. Sept. II, 1807, 6H ; pi. cxxiv.- Waoler, Syst, Av. 1827, No. 102, (mixed up with 

 undnlalus.) Ann. Orn. Hiog. V, 1839, 184 ; pi. 417.— In. Bird* Am. IV, 1842, pi. 269.— Nutt. Man. 

 I, 2d ed. 1840, C22. 



JlpUrnus lursulu$, Bon. Lint. 1838.— Ib. Consp, 1850, 129, 



Picus {Jlplernus) Iridaclytus, Sw. F. Bor. Am. II, 1831, 311 ; pi. Ivi. 



.Iplemvs nmeriranus, Siv Clan. Birds, II, 1837, 306, 



