. Key to North American birds; containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary . 268, pi. 269 ; Nutt., i, 2d ed. 622 ; Bd., 98 ; P. tridactyliisSwains., F. ii,311,pl. 56; P. americanus Coop., 385. ameisicanus. Var. DORSALis. Back with an uninterrupted white stripe ; Bd., 100, pi. , f. Mountain region. *^* All the species of this genus are unquestionablymodified derivatives of one circunn)olar stock ; the American seem to have becomecompletely differentiated from the Asia
. Key to North American birds; containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary . 268, pi. 269 ; Nutt., i, 2d ed. 622 ; Bd., 98 ; P. tridactyliisSwains., F. ii,311,pl. 56; P. americanus Coop., 385. ameisicanus. Var. DORSALis. Back with an uninterrupted white stripe ; Bd., 100, pi. , f. Mountain region. *^* All the species of this genus are unquestionablymodified derivatives of one circunn)olar stock ; the American seem to have becomecompletely differentiated from the Asiatic and European, and further divergenceseems to have perfectly sejjarated arcticus from americanus; but doisalis andamericanus are still linked together. 133. Genus SPHTRAPICUS Baird. *^* Tongue not extensible ; the tip brush3; hyoid bones short. Birds of thisgenus feed much upon fruits, as well as insects, and .ilso, it would seem, upon softinner bark (cambium) ; they injure fruit trees by stripping off the bark, sometimesin large areas, instead of simply boring holes. Of the several small species com-monly called sapsuckcrs, they alone deser\e the name. In declaring war against. PICID^, WOODPECKERS.—GEN. 133. 195 woodpeckers, the agriculturist will do well to discriminate between the somewhatinjurious and the highly beneficial species. Yellow-bellied Woodpecker. $ with the crown crimson, bordered allaround with black; chin, tliroat and breast black, enclosing a large crimsonpatch on the former (in the $ ; in the 9 this patch white) ; sides of headwith a white line starting from thenasal feathers and dividing theblack of the throat from a trans-ocular black stripe, this separatedfrom the black of the crown by awhite postocular stripe ; all thesestripes frequently yellowish;under parts dingy yellow, brown-ish and with sagittate dusky markson the sides ; back variegated withblack and yellowish-brown ; wingsblack with a large oblique whitebar on the coverts, the quills withnum
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