User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-429226-20130603031141

I think the "earwig" monster might be the opposite sex counterpart of Aruserutasu. If you are wonder why they look compeletly different, it could be due to sexual dimorphism. They also share the same color scheme and patterns on there bodies too. The large segment behind the head of the "earwig" monster might be a elytrons(the plates that cover the wings of beetles and grasshoopers) of some kind. It is rare to see a earwig flying in real life and some species of earwings don't have wings at all, so im not surprised if this monster doesn't.

When the Aruserutasu was captured it look like its was being injected with fliud of some kind that might be simlar with gonadal steroids and is why they fight together.

I wonder if you have beat them to unlock the insect staff...

Im just speculating on everything so don't take my comment too serious ok?