Forest and stream . n of theskin caused hy the epihranchials of the hvoidean apparatus beneath it; g. spinal tract; /, inner humeral tract; e, humeral tract; ft, lower dilation of spinal tract (the saddle); j, lower part ofspinal tract (rump tract); i, crural tract; o, femoral tract (very faintly seen m a woodpecker); p, caudal tract; q, alar tract. > ig. 3.—Anterior or ventral aspect of the same specimen, with itshead turned to the left; a, capital tract; n, the ventral tract, and m, its external branch. All the figures drawn by the author from the specimen. as a narrow, median, longitudin
Forest and stream . n of theskin caused hy the epihranchials of the hvoidean apparatus beneath it; g. spinal tract; /, inner humeral tract; e, humeral tract; ft, lower dilation of spinal tract (the saddle); j, lower part ofspinal tract (rump tract); i, crural tract; o, femoral tract (very faintly seen m a woodpecker); p, caudal tract; q, alar tract. > ig. 3.—Anterior or ventral aspect of the same specimen, with itshead turned to the left; a, capital tract; n, the ventral tract, and m, its external branch. All the figures drawn by the author from the specimen. as a narrow, median, longitudinal strip, which dilates atthe middle of the back as a bifurcated saddle-tract(Fig. 2, g and 7i); then occurs an interruption when a rumpdivision of the spinal-tract commences and extends downover the tufted oil-gland (j), while that part which iscarried over the caudal region (the true tail of a bird) isdesignated as the caudal-tract. Turning to Sphyrapicuswe note that there is no interruption in the spinal-tract,. FiQ. i.—Ventral view of a plucked specimen of the red-napedwoodpecker (Sphyrapicus v. nuchalis), showing its pterylosis orfeather-tracts. (Life size, by the author from nature.)and that the saddle portion is a lozenge-shaped area, asshown in Fig. 5. This is particularly interesting whentaken in connection with the condition of the hyoid inthis bird, for the arrangement is quite similar to thespinal-tract as it is found in passerine birds also show a great variation in their spinal tracts,and I hope some of the readers of Forest and Streamwill demonstrate this to their own satisfaction. Still referring to Figure 2, we note that the humeralregion of each arm is obliquely crossed by a narrowfeather strip (e), which is known as the humeral-tract (thesingle long bone of the arm is the humerus), while inour woodpeckers we see a character quite peculiar tothem, being present in both of our specimens, and shownat/, a little separate tract, called the inne
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectf, booksubjecthunting
