98 



U. S. p. H. K. EXP. AND SURVEYS — ZOOLOGT — GENERAL REPORT. 



Comparative measurements of species. 



PICOIDES ARCTICUS. 



Black Backed Three-toed Woodpecker. 



Pirns {Jlpternia) arcticus, Sw. F. Bor. Am. II, 1831, 313. 



^pternus arciicus, Ep. List, 1838 Ib. Consp. 1850, 139.— Newbekrt, Zool. Cal. and Oreg. Route, 91; Rep. 



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

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



1840, 691. 

 Picus tridaetylus, Bon. Am. Orn. II, 1838, 14 ; pl.xiv, f. 2.— Ano. Orn. Biog. II, 1884, 198 ; pi. 132. 



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

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

 breast longitudinally striped, and on the 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 the bill brown. Exposed 

 portion of two outer tail feathers (1st and 3d) white. 



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



Hab. — 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 

 back entirely black. The white line from the eye is usually almost imperceptible, if not 

 wanting entirely. 



lAst of specimens. 



PICOIDES HIRSUTUS. 



Banded Three-toed Woodpecker. 



Picus hirautus, Vieill. Ois. Am. Sept. II, 1807, 68 ; pi, cxxiv. — Waoler, Syst. Av. 1827, No, 102, (mixed up with 

 wndulatus.) AuD. Orn. Biog. V, 1839, 184 ; pi, 417.— Ib, Birds Am. IV, 1842, pi. 269.— Nutt. Man. 

 I, 2d ed. 1840, 622. 



.^ptemus Hrsutus, Bon. List. 1838. — Ib. Consp. 1850, 129. 



Picus {Jpternus) tridaetylus, Sw, F, JBor. Am. 11, 1831, 311 ; pi. Ivi. 



.3pternus ameritanus, Siv. Class. Birds, II, 1837, 306, 



