the Tanzanian 'flying snake' / Kongamato cousin nobody talks about — anyone got the real account?

so everyone knows Kongamato from Zambia, but i keep seeing offhand mentions of an East African winged-snake thing and i want the actual source, not vibes. from what i pieced together: there's an older report tied to a British official, I think the name floating around is Hichens, who wrote in the 3……