Birder's Guide

DEC 2018

Birder's Guide is the American Birding Association's newest publication. Each issue focuses on a key subject, providing tips from experienced birders on a wide variety of topics like Travel, Listing & Taxonomy, Gear, and Conservation & Community.

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34 Birder's Guide to Listing & Taxonomy | December 2018 This year, the topics most likely to generate discussion are splits of White-collared Seedeater and the "resurrection" of Canada Jay. There are also many changes that affect spe- cies found only in the Caribbean or the part of North America that falls south of the U.S.–Mexico border. These changes are detailed on the ABA Blog at tinyurl. com/2018NACC Goodbye, White-collared Seedeater! –––––––––––––––––––––––––––––––––– • Cinnamon-rumped Seedeater* (Sporophila torqueloa)* Check-list Supplement Redux, v. 2018 T Every summer, birders anxiously await publication of the " Check-list Supplement" by the American Ornithological Society's North American Classification Committee (a.k.a. the NACC). The supplement details revisions to the NACC's Check-list . This " Check-list Redux", the eighth annual summary appearing in ABA publications, aims to explain in straightforward terms what has changed and how those changes impact anyone birding in the U.S. or Canada. Illustrations, photos, charts, and maps are employed where applicable. You can read all the proposals on which the NACC voted this year at checklist.aou.org. Species marked with asterisks (*) below are those which do not appear on the ABA Checklist , either because there are no currently accepted records in the ABA Area or because they are non-natives that have not yet been admitted to the list. Daggers (†) denote extinct species. Nowadays, it can be assumed that any change in taxonomy is due (at least partly) to analysis of new genetic data, so that is not always men - tioned below. As a general policy, the NACC accepts as additions to its North American Check-list any species the ABA's Checklist Committee adds to its list. Those changes are not listed here. • Morelet's Seedeater (Sporophila moreletti) White-collared Seedeater (Sporophila torqueola, sensu lato) has been split into two species: Cinnamon-rumped Seedeater (Sporophila torqueola, sensu stricto) and Morelet's Seedeater (Sporophila morelleti). Morelet's Seedeater is now the only species of true tanager which regularly breeds in the continental U.S. (Scarlet Tanager, Western Tanager, and the other members of Piranga are actually in the car- dinal family.) Morelet's Seedeater reaches the northern end of its range along the Rio Grande in southern Texas; from there, its range extends south along the Gulf and Caribbean coasts to the southern end of its range in western Panama. It is also found on the Pacific slope from Panama north to Oaxaca. Cinnamon-rumped Seedeater is en- demic to the Pacific slope and interior of Mexico, from Oaxaca north to southern Sonora and disjunctly in southern Baja California Sur. Unaccepted ABA Area re- cords of the species come from Nogales, Arizona; Mission, Texas; and San Diego, California. The last location has played Adult male Morelet's Seedeaters of the nominate subspecies moreletti , such as this individual from Belize, are more boldly patterned than their northern sharpei cousins. They have mostly whitish underparts and rump, a thick and complete black collar across the upper breast, a black crown and back, and large white tips to the tertials. Moreletti is found from southern Mexico to Costa Rica. The two subspecies intergrade in southeastern Mexico. Photo © Patty McGann Adult male Morelet's Seedeaters of the subspecies sharpei , found in northeast Mexico and southern Texas, have pale buffy underparts and rump, a broken black collar across the upper breast, an olive tinge to the back and crown, and mostly black tertials. Photo © Carlos Escamilla Adult female Morelet's Seedeaters of the subspecies sharpei have bold white wingbars. Their richly colored fresh (fall) plumage, seen here, wears to a duller color by summer. Photo © Carlos Escamilla

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