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The provenance of the two specimens constituting the only evidence of the occurrence of the Bumblebee Hummingbird in the United States has been questioned. But their origin in or near Ramsey Canyon, Arizona, in 1896 is confirmed from the journal of Harry S. Swarth, one of the four collectors who mounted an expedition to the Huachuca Mountains that year. In his journal, Swarth mentioned them as unidentified hummingbirds, one collected in Miller Canyon on 29 June 1896, the other in Brown’s Canyon, a side canyon of Ramsey Canyon, the following day. The Bumblebee Hummingbird (Atthis heloisa) occupies a singular place in the history of Arizona ornithology. The only United States record for this very small hummingbird is based on two specimens collected in 1896 at Ramsey Canyon, in the Huachuca Mountains of southern Arizona. An adult female skin (USNM 153886) is held in the collection at the U.S. National Museum of Natural History, Smithsonian Institution (Figure 1), and an immature female (MVZ 10299) is in the Museum of Vertebrate Zoology at the University of California, Berkeley (Figure 2). Harry Rising collected the birds and companion William B. Judson prepared them as museum specimens; both were young ornithologists on a collecting expedition to Ramsey Canyon. The tag attached to each specimen bears the date “July 2, 1896” and the name W. B. Judson. Robert Ridgway (1898) described the Ramsey Canyon specimens as a new species of Atthis (A. morcomi), and later Harry S. Swarth gave details on their acquisition in two publications on Arizona birds (Swarth 1904, 1914). In 1910, these records were included in the third edition of the American Ornithologists’ Union’s checklist of North American birds. Their identity is not disputed. However, questions about the authenticity or provenance of these records have arisen because the Bumblebee Hummingbird has not been sighted in the United States since 1896 (Zyskowski et al. 1998, Dunn and Alderfer 2017). Could Rising or Judson have collected the birds in Mexico or acquired Figure 1. Adult female Bumblebee Hummingbird (Atthis heloisa) in the collection at the U.S. National Museum. Photo by Christopher Milensky

The Bumblebee Hummingbirds (Atthis heloisa) of Ramsey Canyon Revisited