They were carefully hidden in a hollow space of the cactus called Austrocylindrica sublata, a space where the bloom faded and dried-off. I discovered them when I was taking a macro of the flowers of this cactus and I was surprised by these two bugs.
They are useful bugs ..the farmers deploy them to protect their crops from parasites in grow tents. Sometimes, the farmers help each other by lending them to and with each other.