entomologist
The Sound of Butterflies, Rachael King, 2006
Brazilian Morpho 
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An engrossing first novel from New Zealand writer King about a British amateur entomologist who joins an Amazon expedition in the early Twentieth Century in hopes of discovering a mythical asymetrically colored species of butterfly. The expedition is sponsored by a mysterious Brizilian Portugese rubber baron.
Manaos Teatro <><> 
River Boats at Manaos 
Features adventures exploring the Amazon Rio Negra with stays in rubber wealthy Manaos and its seldom used grand opera hous. They meet a half gypsy crippled soldier who becomes their guide and advisor. Halfway through the novel turns dark but is worthwhile reading.
Rio Negra 