I fed the spiderlings this morning, and it seems that while I have had pretty good luck with the food cooperating with me, this morning proved to be different.
All 3 times that I tried to gather roaches with the film container, at least 2 tried to escape! The mother, who is humongous, was the first to make the daring attempt! I had to scoop her into a temporary container while I gathered the other escapees and fed them to the slings.
This is why I always use a long gift box bottom to handle my bugs in.
SidNata-1
Roaches-0.
Feeding Chart*
Isis-3
Tank (Darwin)-3
Serj-4(accidentally)
Stoopid Roaches. 
From the Desktop of Sid and Nata 