Not straightforward.
Lafresnaye published the name with a description in
the Nov 1842 issue of Rev. Zool.; but he attributed it to Florent Prévost in the the
Zoologie of the voyage of the
Vénus, and did not present it as new. This journal usually published the issue for a given month early in the next month (each issue included reports covering learned societies meetings for the entire month; in the present case, there is a report on the 28 Nov 1842 meeting of the
Académie des Sciences on p. 368 of this issue). Thus new names in this issue should probably be dated to Dec 1842.
Prévost & Des Murs authored the ornithological part of the
Zoologie of the voyage of the
Vénus. The
Zoologie included a text volume and an atlas volume; botyh were both published in parts.
The publication of
the ornithological text was reported by
Hartlaub in 1850, in a report covering works that had appeared in 1849.
The publication of
the bird plates was reported as having occurred by
Wagner in 1845, in a report covering works that had appeared in 1844, where Wagner indicated that the
G. squamigera plate was in the 1st of the 6 parts of the atlas that had been published so far.
In
Priority! (2011), Edward Dickinson recommended using 1846 for the plates of the atlas, citing
Zimmer 1926 and
Sherborn & Woodward 1901.
In a sequel to Priority! published in 2012, Dickinson & Jones then noted that three of the names introduced in the atlas had been used by Lafresnaye in 1842 and that, if the plates were accepted as having been published in 1846, these names had to be attributed to him.
On
Zoonomen, on the other hand, all the bird plates of the atlas are treated as dating to 1842 (and the names on them remain attributed to Prévost & Des Murs), presumably on the authority of the
Richmond Index.
1846 is certainly not correct (Wagner reported the publication of the plates before this date, see above), but I have so far not seen clear evidence of a publication before 1844.
Note that, in the
Dec 1842 issue of Bull. Soc. Géogr., we can read: