prevostiana / prevostianus / prevostii
● Florent Prévost (or Prévôt) (1794-1870) French museum artist (syn. Amblycercus australis, syn. Amblycercus holosericeus, Anthracothorax).
● Alphonse Prévost (fl. 1850) French artist, ornithologist (Euryceros, syn. Streptopelia picturata).
2) So the second man was the only painter of the museum and his full name was Lucien Alphonse Prévost to find here.
Leads me to the next questions. I wonder if Euryceros is really for Lucien Alphonse Prévost. Here OD and here the plate. At least I see see no hint to which Prévost it was dedicated. But see here. Lesson got the specimen from Florent Prévost and the plate here was from Prêtre (and not from A. Prévost)
On Streptopelia picturata I have as well doubts. If we look here Bonaparte mentioned in the species described before Florent. Another article with the name (but different spelling) here. This makes sense to me as Florent Prévost published as well about pigeons. (Les pigeons. Vol. 2 together with Antoinette Paulette Jacqueline Knip).
I haven't checked the Florent Prévost ones. So it is still possible that there are dedications to Lucien Alphonse Prévost the artist. Why they know here that he was born at 6 octobre 1799, I have no clue.
PS. Amblycercus holosericeus australis or Amblycercus holosericeus = Amblycercus prevostii is in fact for Florent Prévost here plate and here is mentioned his name. Anthracothorax prevostii here as well.