A visit to Burgers Zoo - Arnhem - the Netherlands gave me 4 more species :
18) Spectacled or Dusky langur ( see Spectacled - Dusky - langur | ZooChat )
19) Siamang
20) Sunda pig-tailed macaque ( see Sunda pig-tailed macaque | ZooChat )
21) Black lemur ( see : Black lemurs | ZooChat )
Saw also the other primates : nice group of Gorillas with one very pregnant female, Chimps and Ring-tailed lemurs but missed the Golden-bellied mangabeys and the Golden-cheeked gibbons.It was quite cold that day and all monkeys were indoors and I couldn't find the indoor-enclosures of those both species, even don't know if they are visuable for the public.
22) White-faced saki ( see White-faced saki | ZooChat)
23) Grey-handed night monkey ( see Grey-handed night monkey | ZooChat )
24) Gray mouse lemur ( see Gray mouse lemur | ZooChat )
25) Cotton-top tamarin ( see Cotton-top tamarins with baby | ZooChat )
26) Emperor tamarin ( see Emperor tamarin | ZooChat )
27) Crested black macaque ( see Crested black macaque | ZooChat )
28) Black spider monkey ( see Black spider monkey with young | ZooChat )
29) Red-cheeked gibbon ( see Red-cheeked gibbon | ZooChat )
30) Japanese macaque ( see Japanese macaque | ZooChat )
and again missed a good number of species