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Show APPENDIX C- BIRDS. 815 evident from the table of comparative measurements. The bill, too, of the latter, although of much the same proportions, is, decidedly smaller. As in S. arctica, the upper parts are a bright azure blue, more lustrous and deeper on the wings, rump, and tail- coverts. The lower parts are of a light greenish blue, excepting the lower belly and sides, abdomen, and tail- coverts, which are white. The white of the lower parts is clearer and extends higher up on the belly than in S. arctica, and the quills and tail- feathers are much bluer, this colour greatly predominating over the brown on the inner webs and inner faces of the feathers. The clove-brown shows somewhat conspicuously as a broad tip to the quills, which, besides, are very narrowly margined, terminally and internally, with whitish. The outer margins of the primaries, towards the tips, shade into greenish blue. Owing, perhaps, to the plumage not being quite full, many of the feathers of the back and breast have grayish tips. DIMENSIONS. Sialia macropkra, ( Salt Lake, Male.) & arctica, ( Fort Union, Male.) ' Total length 71 inches. ( Skin oontraoted) 6} inches. Extent 14A " Wing folded 4} J " " 4tf " Tail to insertion of middle feathers 3A " " 2f " Depth of fork fjf " ( Tail worn) tf " Projection of longest primary beyond longest secondary or tertiary, ( wing not shut close) , l* tf " Do. wing shut close.... If • 1A " Longest primary beyond shortest, ( MO m " IA " Second primary longer than first, ( spurious).... 3{¥ " , 2f| f u Bill along ridge fj " , f| " Bill, gape f| " | f » Tarsus fc jf " iff " Middle toe A " - fif " " " with claw j| " M ! Xfp " Lateral toes, ( equal) fJ " f£ " " " with claw A " A " Hind toe # " ^ « " " with claw A " A " ( In Ss macroptora.) 1st quill spurious; 3d, longest; 2d, little shorter; 4th, rather less than 2d. |
