Hi,
in these days pupae of Arctia caja started hatching, but I`ve never bred it, so I have a little question: how can I distinguish sexes?
Three moths already hatched have similar antennae. I attach a photo of one. I think that they are females.
Many thanks,
Lorenzo
As you probably know, male moths often find their partners by following the singn of a pheromone, they find it by some kind of radar in their antennae, thats why the antennae are often so big.
Female's don't need to attract pheronomes, so they don't need such big antennae.
But, this way is not always the easyest, Some species the female's have also big antennae, and when you don't see a male of the specie, you can think it's a male because she had antennae.
Better is to look at the 'tail' of the body, the male will have 2 flaps, with in there a little thingy, this is the penis( if i am right ).
The female also has this 2 things, but lots smaller, and when you hold a moth strongly the female will point out the ovipositor.
If a moth starts laying eggs, take a look at the sexual parts, so you'll know what is a female next time.
Moths wo start mating a female, are males ofcourse, also take a look at them, at that way i learned it, and once you know it.. it's easy! 
Kumo,
what`s the name of the moth that you use for your profile photo?
thanks.
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