Hi François,
Many thanks for the valuable clue of which species fly in Guyane. Armed with this knowledge, I looked beyond my own rearing experience/references, and contacted a Brazilian friend who has bred
Opsiphanes cassiae, the chenille of which I had never seen. Thus, I am happy to report I was WRONG – your above photos (and second link in my post) show
O. cassiae,
not O. tamarindi. (Last-instar larvae of
cassiae and
tamarindi are nearly identical in appearance, except that
cassiae have black tips to their coronal projections, while
tamarindi caterpillars more or less lose this black coloration upon reaching their final stadium.) Regarding hostplants,
O. cassina,
O. invirae, and
O. quiteria are known to all use numerous genera of native and ornamental palms, with stray records of
Musa for
cassina and
invirae.
Thank you again for teaching me, François!
Best wishes,
Keith