Calcarius Cf C Lapponicus

REFERRED MATERIAL Premaxilla, DMNH 35729.

provenance Location 1349, Velvet Room, Mark's Sink.

DESCRIPTION The specimen is too fragmentary for positive identification but most closely matches Calcarius lappon-icus in size and characters.

CALCARIUS CF. C. PICTUS (SWAINSON, 1832)

REFERRED MATERIAL Premaxilla, DMNH 43452.

provenance Last Chance Pit, unit 2, level 7.

DESCRIPTION This specimen is larger and more robust than Calcarius lapponicus, narrower at the base than in C. or-natus, and smaller than C. mccownii. It most closely matches the characteristics of C. pictus and is tentatively referred to that species. C. pictus previously has not been reported from Colorado. It prefers dry, grassy environments and tundra and breeds in Alaska and Canada. It migrates primarily through the Great Plains to Kansas and Oklahoma in winter (American Ornithologists' Union, 1998).

CALCARIUS ORNATUS (TOWNSEND, 1837)

REFERRED MATERIAL Two premaxillae, DMNH 35760 and 43311.

provenance Location 1349, Velvet Room, Mark's Sink.

DESCRIPTION These specimens compare well in size and features to this species as described previously. C. ornatus is a common summer resident in the plains of eastern Colorado and a migrant in western valleys. It prefers short- and mixed-grass prairie habitats that are frequently disturbed by fires or grazing (Hill and Gould, 1997).

CALCARIUS SP.

REFERRED MATERIAL Proximal left mandible, DMNH 30160.

provenance Location 644, Velvet Room, grid 7, level 5 (B).

DESCRIPTION This specimen is most similar to Calcarius lapponicus in characters but is slightly smaller than those in three females (FLMNH); no male specimens were available.

EMBERIZIDAE, INDETERMINATE

REFERRED MATERIAL Four distal mandibular symphysis, DMNH 35724, 35736, 41106, and 41119.

PROVENANCE 35724, 35736, and 41119: Location 1349, Velvet Room, Mark's Sink; 41106: Location 1347, Generator Dome, level 1.

DESCRIPTION These specimens are too fragmentary for identification.

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