Découverte et redescription de l'holotype d'Ahaetulla pulverulenta (Duméril, Bibron & Duméril, 1854) (Reptilia, Serpentes, Colubridae), avec une remarque sur le statut de Dryinus fuscus Duméril, Bibron & Duméril, 1854

We discovered in the collections of the Muséum national d’Histoire naturelle of Paris a mislabelled specimen of Ahaetulla pulverulenta (Duméril, Bibron & Duméril, 1854) collected in Sri Lanka by Louis-Théodore Leschenault. On the basis of historical data, we show that this specimen (MNHN 7565) is the holotype of the species; it is here described in detail. We also examine some aspects of the synonymy of this species. The description and the status of the nominal taxon Dryinus fuscus Duméril, Bibron & Duméril, 1854 are discussed, and a neotype is designated to fix its status as a synonym of Ahaetulla nasuta (Bonnaterre, 1790).