This huddle of instars has been identified as a Pycnoscelus species, possibly P. striatus. The photo was taken in Gua Cintamani in 1986.
 

This photo of adult roaches was taken near the one to the left on the same day, in Gua Cintamani. My apologies for not having a better focused picture.

The above two photos of juvenile cockroaches eating a dead adult were taken in 1987 in the Batu Caves, in the upper part of Cavern A, just before the skylight. I wouldn't swear to it, but the the juveniles don't look like Periplaneta americana or Periplaneta australasiae! Could they be Pycnoscelus striatus?