Hydrophilus piceus

imago
Hydrophilus piceus
Hydrophilus piceus

They are which I reared from larve was obtained by my dear dotor. Their lengths and the tarsus projection of foreleg which only male has are somewhat bigger than acuminatus. And also labrum color is different each other.
Will I be able to breed them well also this year?

larva
Hydrophilus piceus
Hydrophilus piceus
pupa
Hydrophilus piceus
Hydrophilus piceus