Hemiptera ID (nymph?)

I found a second female living under my watermelon. I wonder if they could be housed together? The first one eats like crazy. It ate a hisser nymph the first night and has had two more since then. She looks like she could explode. 

 
I found a second female living under my watermelon. I wonder if they could be housed together? The first one eats like crazy. It ate a hisser nymph the first night and has had two more since then. She looks like she could explode. 
In my experience, they are very aggressive and cannibalistic towards each other, and even getting them to mate can be difficult! Seems like the females may be unreceptive to mating attempts until spring, any earlier attempts result in her eating the male, (or sometimes the other way around!). 

 
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