Family Hirundinidae

TACHYCINETA CF. T. BICOLOR VIEILLOT, 1808

REFERRED MATERIAL Premaxilla, DMNH 30097.

provenance Location 644, Velvet Room, grid 9, level 2 (B).

DESCRIPTION The specimen differs from Hirundo rustica and Riparia riparia, which have a slightly longer and narrower bill, and from H. pyrrhonota, which has a nasal bar that rises more steeply posteriorly from the premaxilla than in Tachy-cineta bicolor. T. bicolor is a common summer resident throughout Colorado today.

HIRUNDINIDAE, INDETERMINATE

REFERRED MATERIAL Right humerus, DMNH 30203.

provenance Location 1349, Velvet Room, Mark's Sink (PC-10).

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