Vietnam Primate Conservation Status Review 2002 - Hoang Lien ...

3.4 DELACOUR’S LANGUR - Trachypithecus delacouri
Delacour’s langur were described in the south-western area by locals from Hoi Xuan, but this information
was vague. One hunter recalled killing two Delacour’s langurs around 1978. Ratajszczak et al. (1990)
figure a photo from a Delacour’s langur skin which was offered for sale at NAFORIMEX’s Thanh Hoa office
in September 1989. The provincial representative of the company claimed that the animal was captured
in Quan Hoa district. The most recent sighting was several years previous ago. In Tan Son Village (Thanh
Xuan), the only village inside the Pu Luong reserve boundary, Delacour’s langur was known but the last
sighting dated back 10 years, although local reports revealed that Delacour’s langurs are still present
around Mt. Pha May. One individual was allegedly killed in 1998. Reports claimed that Delcaour’s langurs
were abundant 10 to 20 years ago (groups of 20 to 30 individuals were common), but are now very rare.
In Phu Xuan Village the Delacour’s langur was well known but the most recent sighting was about
8 years prior to the survey. One skin was kept by a hunter. A hunter in Pu Nhiem village reported that
he had hunted one Delacour’s langur in about 1989 but this species was now extirpated in this area
and there were no more sightings from locals.
The estimated number in the south-west part of Pu Luong Nature Reserve is 2-3 groups with about
10 animals (Baker, 1999).
The north-east part of the Pu Luong Nature Reserve has more remote areas with more intact habitat
and the best forest coverage. The largest numbers of Delacour’s langurs in Pu Luong probably live
close to Ho and Lang Hang (Lung Cao Village). During the time of the survey in February 1999 a
hunter killed one Delacour’s langur from a group with 7 animals close to Lang Hang village.
Close to Co Lung village, locals reported a sighting of a group with 5-6 individuals during the survey.
The estimated number in the north-east part of Pu Luong Nature Reserve is 5-6 groups with about
30-35 individuals (Baker, 1999).
Ngoc Son mountainous area, Lac Son and Tan Lac Districts (HOA BINH)
Special use forest: Partly proposed nature reserve
Delacour’s langur status: Occurrence confirmed, last evidence 1999 (Luong Van Hao, 1999b)
Delacour’s langurs were discovered in this area by a FZS survey in 1999.
There are three localities (Bo Village, Ngo Luong Village; Ngoc Son Village) where Delacour’s langurs occur.
Close to Bo Village one group of 5 to 7 animals exists. The last sighting from villagers was reported in
January 1999. Another group with 10 individuals was extirpated in 1990 in this area.
Locals reported one group with 20 animals close to Ngoc Son Village in 1998. One animal was killed
in December 1998 and another one in May 1999. More langurs probably were hunted during this
time because, when the group was last observed in June 1999, it consisted only of 4 animals.
Northern Ba Thuoc mountainous area, Ba Thuoc District (THANH HOA)
Special use forest: None
Delacour’s langur status: Provisional occurrence, last report June 1999 (interview)(Baker, 1999)
Delacour’s langurs were discovered here during the FZS survey in 1999. Direct sightings of Delacour’s
langurs were made in one area.
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