An additional species, the large-billed reed-warbler "Acrocephalus orinus" was known from just one specimen collected by him in 1869 but the name that he used, "magnirostris", was found to be preoccupied and replaced by the name "orinus" provided by Harry Oberholser in 1905. The status of the species was contested until DNA comparisons with similar species in 2002 suggested that it was a valid species. It was only in 2006 that the species was seen in the wild in Thailand, with a match to the specimens confirmed using DNA sequencing. Later searches in museums led to several other specimens that had been overlooked and based on the specimen localities, a breeding region was located in Tajikistan and documented in 2011.