And dont take this the wrong way... but not every bird is going to look like yours! (remember I wasn't blessed with the gift of email so this probaby sounds meaner than I meant it to...)
The reason I think there is a good possibility that the black is a male too, is because judging by the picture(s) the hackles look a little longer than a pullet, as well there looks to be a large number of "hard feathers" in the tail.
However, I could just be reading WAYYY to much into the picture, and you could very well be right. Remember, I said that I wasn't ALWAYS right...
The black one POSSIBLY could be a hen. Try picking each one and listen for their protesting squawk (unless they are extremely tame) they will SOUND different if they are boy and girl, the roo will sound roostery and the hen- henny.