(syn. Synthliboramphus Ϯ Xantus's Murrelet S. hypoleucus) Gr. ενδομυχος endomukhos secret, hidden < ενδον endon within; μυχος mukhos interior; ουρα oura tail; "MICRURIA Grant. This generic name, as used by Mr Ogilvie-Grant , is preoccupied in Coleoptera by Micruria Reitter . Since by reason of the very long tarsi, tail of 12 feathers, and the absence of any spotted condition of plumage, this appears to be a well-defined group, it may bear the name Endomychura, from ενδομυχος, occultus, and ουρα, cauda; the type being Brachyrhampus hypoleucus Xantus" (Oberholser 1899).