abdominal rings

abdominal rings

The apertures in the abdominal wall. External inguinal or superficial: An interval in the aponeurosis of the external oblique muscle, just above and to the outer side of the crest of the pubic bone.
References in classic literature ?
4] I found that this insect emitted the most brilliant flashes when irritated: in the intervals, the abdominal rings were obscured.