Ventralla quadrata is a katydid species naturally occuring in Malaysia. They are not commonly found as pet katydids.

Brown adult female – Ventralla quadrata – giant katydid

This species eat bramble leaves and needs high humidity and high temperature. Especially the nymphs need a lot of humidity, but are also sensitive to fungi / mold and stagnant air. It can be difficult to raise them. The adult males are extremely noisy and can therefore not be kept inside the house without you going crazy. I guess that is part of what makes this species not as popular as other insects as pet. A better katydid as a pet would be the Giant Katydid.

Here you can find some pictures of this species.