oops, misread...
Ok, from my experience, things that have killed my locusts fall into 5 categories:
Heat: - too much or too little - too little is better than too much as they dehydrate or burn themselves on the lamp/ heatmat if it's too hot - too little means a longer reproductive period (degree days)
Lack of food - they do need to eat - pretty obvious this one
Lack of water - even though SGs and LMs are found in hot places and are used to minimal rainfall/ moisture, they do need water- so fresh veg is essential, if lettuce/ cabbage is too expensive to go out and get specifically for them then give them the discards from cooking etc. Or use grass/ dandelion leaves
Bacteria/ fungi/ pesticides - If you do go out and get stuff from the garden- make sure it hasn't been sprayed or is near a field that has - especially near *organic* fields. A few drops of pesticide will kill one or two, a few drops of BT could wipe out the colony
However, all the above I have found have been minor to:
THE STUPID THINGS KNOCK THEMSELVES OUT ON THE GLASS!!!
-yes, this has been my biggest killer... Every time I walked in on them, they'd jump around like crazy and knock themselves out. Height in a locust's case is more important than width. And try not to get a container that has sloping sides - if a locust jumps up a straight piece of glass it will hit air- if it jumps up a slanted piece of glass, it will hit the glass...