Order Primates Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 1 111 184 book chapter 0-8018-8221-4 10.5281/zenodo.7316519 Presbytis siamensis Müller and Schlegel 1841 Presbytis siamensis Müller and Schlegel 1841 , in: Temminck, Verh. Nat. Ges. Overz. Bezitt. Zool. (Mamm.): 60 . Type Locality: Malaya, Melaka . Vernacular Names: White-thighed Surili . Subspecies: : Subspecies Presbytis siamensis subsp. siamensis Müller and Schlegel 1841 Subspecies Presbytis siamensis subsp. cana Miller 1906 Subspecies Presbytis siamensis subsp. paenulata Chasen 1940 Subspecies Presbytis siamensis subsp. rhionis Miller 1903 Distribution: Malay Peninsula, except far south and northwest; E Sumatra between Siak and Inderagiri Rivers, between Rokan and Barimun Rivers, Lake Toba region, and perhaps Jambi district ; Kundur, Bintang, and probably Batam and Galang Isls, Riau Arch. ( Indonesia ). Conservation: CITES – Appendix II; IUCN – Lower Risk (lc). Discussion: Separated from P. femoralis by Brandon-Jones (1984) .