Macgregor's Bowerbird Amblyornis macgregoriae of the uplands of New Guinea was named by Charles W. De Vis and was ‘Dedicated to Lady Macgregor’, wife of Sir William McGregor (sic) who was Administrator of British New Guinea during 1888–98 (knighted in 1889) by the specific name macgregoriae (De Vis 1890). Sir William's surname was originally, and thus formally, McGregor but he adopted the spelling MacGregor while in New Guinea as his personal preference.
Similarly, what was long called Macgregor's Bird of Paradise of the highlands of New Guinea was originally named Macgregoria pulchra by De Vis (1897) ‘after Lady Macgregor’ and was known thereafter as Macgregor's, or by some MacGregor's, Bird of Paradise. Having long been thought to be a bird of paradise, it is now established that Macgregoria pulchra is in fact a large honeyeater with extensive facial wattling, and was therefore re-named Macgregor's Honeyeater (Cracraft & Feinstein 2000).
In their Introduction del Hoyo et al. (2009: 46–47) discussed the issue of the English name spelling for the bowerbird and honeyeater, and their confusion as to the correct usage. They undertook ‘an extensive search’, which ‘did not prove totally conclusive'. Because these authors found that Lady Mary McGregor signed her letters ‘MacGregor’ they considered it proof of what the McGregors ‘used themselves'. Del Hoyo et al. (2009) apparently did not, however, appreciate that their formal name was McGregor and that Lady Mary's signature merely reflected her husband's idiosyncratic personal preference. Jobling (1991: 136) used the correct spelling Lady Mary McGregor but subsequently (Jobling 2010: 234) employed MacGregor, perhaps influenced by del Hoyo et al. (2009).
Contrary to the widespread use of the vernacular name Macgregor's for the bowerbird and what is now the honeyeater for some 120 years in major publications dealing specifically with the bowerbirds and birds of paradise (e.g. Gilliard 1969, Cooper & Forshaw 1977, Everett 1978, Peckover 1997, Frith & Beehler 1998, Lenz 1999, Frith & Frith 2004, 2008, 2010) some authors (e.g. Iredale 1950, Gregory 2019) use MacGregor's in one or both cases. It is difficult to see any point or benefit in changing Macgregor's to MacGregor's for the name for the bowerbird and honeyeater, as the former was consistently used in the majority of the relevant ornithological literature. The argument that MacGregor's should be used because McGregor personally preferred it is fundamentally weak. A far stronger argument is that the names should be changed to McGregor's Bowerbird and McGregor's Honeyeater because that was the man's official name (but see below).
The rules for zoological nomenclature do not apply to vernacular names. Pertinent points that should be considered, however, are:
(1) That the International Ornithological Committee (IOC; Gill & Wright 2006) listed ten rules or principles that should be considered in applying common names. The first was that ‘Existing usage would be the predominant guideline'. The spelling Macgregor's for the two bird species involved here could not be more long established—that spelling having been used by most authoritative authors since both birds were named. Thus to apply the first rule correctly the name should be Macgregor's.
(2) Had De Vis applied a common name to Amblyornis macgregoriae and Macgregoria pulchra in describing them he would doubtless have used Macgregor's Bowerbird and Macgregor's Bird of Paradise respectively, as is consistent with his dedications.
(3) Gregory (2019: 320) stated ‘the long-standing usage' of Macgregor's is wrong and that MacGregor's is correct because that is how ‘Sir William signed his name’ but this is erroneously selective history because Sir William's original surname was McGregor.
(4) Changes such as this lead to confusion and inconsistent misuse in the literature: such as in del Hoyo & Collar (2016) in which both MacGregor's Bowerbird and Macgregor's Honeyeater are conflictingly applied!
(5) In Rand & Gilliard (1967) MacGregor's Bowerbird and MacGregor's Bird of Paradise are used, whereas in Gilliard (1969) Macgregor's is used, suggesting Gilliard, specialist in these two bird groups (or his colleagues, as his monograph was published posthumously), came to consider the latter the correct usage.
(8) Rule 8 of the IOC, in applying vernacular names to birds, noted that ‘brevity and simplicity are virtues'. Surely having an (unnecessary and erroneous) upper case letter in the middle of a common name makes for complexity and confusion rather than simplicity.
I am not arguing for a change of names to McGregor's (Sir William's correct name) Bowerbird and McGregor's Honeyeater. This would be change for the sake of change, and no more helpful than the change to MacGregor's from the original and long and widely used Macgregor's—an unnecessary and erroneous change for no good, logical or justifiable reason.
Future confusion and contradictory usage, as is clearly demonstrated above as occurring in recent literature, is best avoided by using the long-standing vernacular name Macgregor's for the bowerbird and honeyeater.
I thank my esteemed fellow New Guinea ornithologists Bruce Beehler, K. David Bishop, Richard Donaghey Thane Pratt and Edwin Scholes, and eminent natural history author Stanley Breeden, for kindly commenting objectively on a draft of this note; and Guy Kirwan for valued editing and sound advice.