Oh dear, I thought i had done so well with the amount of info from these pics, I do not recall seeing any yellow, but probably wasn't being observant of that. Sorry.
The photos are great for a grasshopper! Great angle of light, close enough for good detail. But sometimes it helps to see the hindwing pattern. In this resting pose, the hindwing is folded several times under the front wings, so it can only be seen in flight. Or, if you catch it in hand, you can spread the wings manually.
Cryptobothrus chrysophorus has yellow wings in flight and it makes a buzzing sound while gliding. Usually if you get too close they'll show both of these traits.