Agile gibbon, Hylobates agilis Julielangford via Wikicommons, Creative Commons Attribution ShareAlike.	Lar gibbon, Hylobates lar "Want my opinion? Here it is!" by Jinterwas via Flickr, Creative Commons Attribution.
Silvery gibbon, Hylobates moloch Afrank99 via Wikicommons, Creative Commons Attribution ShareAlike.	Müller's Bornean gibbon, Hylobates muelleri Greg Hume via Wikicommons, Creative Commons Attribution ShareAlike.
Pileated gibbon, Hylobates pileatus Su neko via Wikicommons, Creative Commons Attribution ShareAlike.

Taxonomy:

Agile gibbon, Hylobates agilis

Hylobates agilis agilis (Add)
Hylobates agilis albibarbis (Add)
Hylobates agilis unko (Add)

Lar gibbon, Hylobates lar

Hylobates lar carpenteri (Add)
Hylobates lar entelloides (Add)
Hylobates lar lar (Add)
Hylobates lar vestitus (Add)
Hylobates lar yunnanensis (Add)

Silvery gibbon, Hylobates moloch

Hylobates moloch moloch (Add)
Hylobates moloch pongoalsoni (Add)

Müller's Bornean gibbon, Hylobates muelleri

Hylobates muelleri abbotti (Add)
Hylobates muelleri funereus (Add)
Hylobates muelleri muelleri (Add)

Pileated gibbon, Hylobates pileatus