Male or Female

I just gor a rose hair T and was wondering if there is a way to tell whether it is a male or a female. THANX

The best way it to sex a shed skin and look for flaps inbetween the booklungs (assuming the T is around 2" leg to leg, if it's smaller the flap may not be developed enough to see). If you've got a flap between the booklungs, it's a female.

Another way to sex T's is ventral sexing. This takes a bit of practice to get right.

Here's a link about tarnatula sexing that explains ventral sexing.
http://www.birdspiders.com/faq_sex.html