That's why Tom called "Night Butterfly" a misnomer. I am sure he wasn't referring to "Butterflies of the night".
Despite my English is terrific, I don't believe that Tom's "night butterfly" is synonym of "day flying moth". Day flying moth design moths that fly during the day time as the name suggest (such as Agaristid, Aletis, etc...). I unsderstood that Tom put the finger on the difference between some difference in vocabulary in French and English that led to the misnomer "night butterfly".
s'il n'y pas de solution c'est qu'il n'y a pas de problème ! akuna matata ....
In bahasa indonesia, kupu kupu = butterfly and malam = night. Anyway, if you are looking for Saturniidae or Sphingidae, do not ask where are the "kupu kupu malam", otherwise you will be told neighborhood brothels!
If I recall correctly, recently the Lepidopterists' Society of Africa decided they'd refer to all leps as "butterflies" regardless of when they fly or if they have clubbed antennae or not. For awhile, in their newsletters, they'd tried out "buttermoths"... which is terrible in my opinion.
But I remember when I started to learn English word butterfly sounded funny and with not much sense to me too. What is the relation of butter and fly to the insect we call now butterfly? Or maybe butter was named after butterfly?