Silkworm males are

Silkworm males are Homogametic.
The domestic silk moth (Bombyx mori) is an insect from the moth family Bombycidae. It is the closest relative of Bombyx mandarina, the wild silk moth.
Yoshimaro Tanaka discovered that B. mori females are heterogametic (WZ), whereas B. mori males are homogametic.
The term homogametic is often used to define an organism or individual producing all the gametes of the same type. The homogametic individuals possess matching pairs of sex chromosomes in contrast to heterogametic individuals who carry sex chromosomes of different types.