Cricket Breeding

[Uppercut]

Hi there!

Im going for my first try to breed crickets. I have already read tons of stuff about them so Im pretty sure about what to do but all the guides are directed to the Achetus Domesticus. The thing is, I dont think the crickets I buy from the petstore are exactly like that....
The crickets I buy are labeled mini-crickets for feeding but are alot darker, dont have wings, and from the last batch of 40-50 that I bought, I couldnt differ the males from the females because they all have only two spikes at their "bottom" and no ovipositor.

So can someone please tell me what kind of crickets do I have?

Heres a photo, all of them look pretty much the same:
Thanks