I found the same :
Pyrrhulagra Bonaparte, Consp. Gen. Av., 1, (2), p. 492, 1850, type species, subsequent designation (Gray) Loxia portoricensis Daudin.
The various works by Gray (
1840,
1841,
1855) on the genera of birds are a primary source of subsequent type-species designations. (He was the first author to produce extensive lists of genera, with a type cited for every genus he treated as valid; most authors before him did not apply the type concept at all, and many genera had no fixed type species yet; as a result, in many instances, when Gray listed a type, he produced a new type fixation.) So, if looking for a type designation for a generic name proposed around this time, Gray's works are among the first ones which it is logical to check.
But this doesn't make Gray's writings God's word: if there is an earlier explicit type designation that conflicts with Gray's, this earlier type designation stands.
It's quite hard to deny that
avec le Dr. Schiff de Francfort, nous appellons Pyrrhulagra un nouveau genre dont Fringilla noctis, L. est le type
...is a statement that
Fringilla noctis L. is the type of the new genus
Pyrrhulagra "Schiff" Bonaparte 1850...
Jon Boyd uses
Melopyrrha for this little clade.
http://jboyd.net/Taxo/Dacninae3.pdf
Surely there's no issues with that is there?
Melopyrrha is the name that
Burns et al. 2014 recommended using (which John Boyd followed, presumably). But, in the recent paper, they changed their mind, and write that "
Pyrrhulagra Bonaparte, 1850, has priority over
Melopyrrha Bonaparte, 1853 (type =
Loxia nigra Linnaeus, 1758, currently
Melopyrrha nigra), and cannot be considered a
nomen oblitum"... This is all correct except that, if the type of
Pyrrhulagra is
noctis, the name doesn't apply to the group in question at all. (This makes it an objective synonym of
Loxigilla Lesson 1831 [
OD]; type designated as
Fringilla noctis Linn. by
Gray 1855 -- who amazingly also listed
Pyrrhulagra as a synonym here, in addition to treating it as valid with another type species on the next page... -- ; as Lesson's name is in use, older, and not preoccupied,
Pyrrhulagra is objectively invalid.)
Melopyrrha Bonaparte 1853 [
OD]: this is extremely close to be a
nomen nudum (no included nominal species, "je crée le genre
Melopyrrha pour les soi-disant Bouvreuils noirs d'Amérique non encore déterminés d'une manière satisfaisante." is the
only "indication" provided). But
Gray 1855 accepted it and designated
Loxia nigra Linn. as its type.
This name has also been attributed directly to Gray 1855, which presumably wouldn't have much effect on its treatment as valid.