Family Fringillidae

LEUCOSTICTE TEPHROCOTIS (SWAINSON, 1832)

REFERRED MATERIAL Ten premaxillae, DMNH 10552, 30081, 30097, 35747, 35749, 35801, 35806, 41119, 43313, and 43450; 14 distal mandibular symphyses, DMNH 30081 (2), 35383, 35397, 35746, 35812, 35813, 41119 (2), 41130, 41210, 43312, 43315, and 43327.

provenance 30097: Location 644, Velvet Room, grid 9, level 2 (B); 35397: Location 644, Velvet Room, grid 11, level 5 (C); 10552: Location 644, Velvet Room, grid 6, level 1 (A); 30081, 35383 , 35746, 35747, 35749, 35801, 35806, 35812, 35813, 41119, 41130, 41210, 43312, 43313, 43315, and 43327: Location 1349, Velvet Room, Mark's Sink; 43450: Location 2433, Last Chance Pit.

DESCRIPTION This species is recognized by the pre-maxilla, which narrows toward the distal tip and is slightly broader and more robust in Leucosticte tephrocotis as opposed to a slightly more convex margin to the tip and narrower shape in L. atrata, and by a slightly shorter mandibular sym-physis as compared to the latter species; no specimens of L. australis were available for comparison. L. tephrocotis is a winter resident in the foothills and mountain parks of Colorado, where it prefers meadows and shrublands.

LEUCOSTICTE ATRATA RIDGWAY, 1874

REFERRED MATERIAL Four distal mandibular symphyses, DMNH 30080 (2), 30081, and 30097.

PROVENANCE 30080 and 30081: Location 1349, Velvet Room, Mark's Sink; 30097: Location 644, Velvet Room, grid 9, level 2 (B).

DESCRIPTION The symphyses are slightly longer in these fossils and in Leucosticte atrata compared to a shorter symphysis in L. tephrocotis. L. atrata is an irregular to common winter resident in mountain parks and meadows of western Colorado.

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