Insecticides with permethrin in them are very effective but not around cats as it's very toxic to them, but not so much other mammals. Unfortunately it's also toxic to bees and other pollinators so should at least be kept away from blooms.
There are also natural alternatives like products containing Nosema locustae which is a type of fungal spore. It costs more and works much slower. I assume it would work on that type of "grasshopper" but have never seen them before so I'm not 100% confident.
Keep your grass cut short to limit their mobility.