Horseshoe crab sexing?

[Betta132]

All my horseshoe crab roaches are about adult size, and they all have stubbly little wings. Does that mean they're all males?

If yes, anyone have a couple of female horseshoe crab roaches they're willing to sell? 

 

[Hisserdude]

Both males and females have stubby little wings, but males have more round wings, whereas the female's wings are squared off.

The best way to sex roaches is via the ventral segments, see here:

As you can see, the female has a much larger last ventral segment than the male. This method can be used for almost all Blaberids, including H.tenebricosa.