subspecies

Valanga nigricornis fortis (Walker, 1870)

Holotype; female; c254ae5d-4a33-4fca-870d-058fab902959; deposited at: Natural History Museum, London (NHMUK); Philippines: Savu

Cyrtacanthacris fortis Walker, 1870: 567. (valid)
Holotype; female; c254ae5d-4a33-4fca-870d-058fab902959; deposited at: Natural History Museum, London (NHMUK); Philippines: Savu
Acridium forte (Walker, 1870) in Finot, 1907: 337.
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Finot, P.A.P. (1907) Sur le genre Acridium. Contribution a l'étude du genre Acridium Serville de la famille des Acridiens, insectes orthoptères, avec descriptions d'espèces nouvelles. Annales de la Société Entomologique de France, 76, 247–354. Available at https://www.biodiversitylibrary.org/item/34145#page/265/mode/1up
Kevan, D.K.M.E. (1966) Some Orthoptera-Caelifera from the Philippine, Bismarck and Solomon Islands, with a few interesting records from New Guinea and the Moluccas. Entomologiske Meddelelser, 34, 375–420. Available at https://danbif.dk/research-files/litteratur/entomologiske-meddelelser/bind-34/kevan__d._k._m._1966.pdf
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Walker, F. (1870) In Catalogue of the Specimens of Dermaptera Saltatoria in the Collection of the British Museum. London. Vol. 3, 425–604 pp. Available at http://www.archive.org/details/catalogueofspeci03britrich
Willemse, C.J.M. (1957) Synopsis of the Acridoidea of the Indo-Malayan and adjacent regions (Insecta, Orthoptera) (contd.). Publicaties van het natuurhistorisch Genootschap in Limburg, 10, 227–500.