The Hercules Beetle and Its Captive Breeding and Rearing
By Kay
A tiny dent may be visible on the 9th abdominal segment of the ventral side of a male larva after its mid L2 stage. There is no dent on a female larva. Besides, an L3 male often exceeds 100 grams in weight when it is fully grown, whereas a female remains below about 80 grams.
Image: Kay
