Faasino i le vaega o loo i lalo ma tali le fesili mulimuli ane i le gagana lava lea e tasi e pei o le vaega:  O le D. russelii e maua i Initia, Sri Lanka, Bangladesh, Nepal, Myanmar, Thailand, Pakistan, Cambodia, Tibet, Saina (Guangxi, Guangdong), Taiwan ma Indonesia (Endeh, Flores, sasaʻe o Java, Komodo, ma Lomblen Islands). O le ituaiga o nofoaga o loo lisiina o "Initia". O le mea moni, o le talafatai o Coromandel, e tusa ai ma le manatu o Russell (1796). Na taʻua e Brown (1973) e mafai foʻi ona maua i Vietnam, Laos, ma le motu o Indonesia o Sumatra. Na lipotia mai na maua foʻi e Ditmars (1937) se faataʻitaʻiga mai i Sumatra. Ae ui i lea, o le tufatufaina atu o lenei ituaiga i le atumotu o Initonesia o loʻo faʻamalamalamaina pea. I totonu o lona nofoaga, e mafai ona taatele i nisi eria, ae seasea i isi. I Initia, e tele i Punjab, e taatele i le talafatai i sisifo ma ona mauga, i Initia i saute ma le itu i mātū i Bengal. E seāseā tupu i le vanu o le Ganga, i mātū o Bengal, ma Assam. E taatele i Myanmar. E masani foʻi ona iai i Taialani i Pattaya ma isi aai o loo iai turisi, lea e tele ai meaʻai a le isumu.  Fesili: O fea e maua ai le D. russelii?
Initia, Sri Lanka, Bangladesh, Nepal, Myanmar, Thailand, Pakistan, Cambodia, Tibet, Saina (Guangxi, Guangdong), Taiwan ma Initonesia