We believe this is Sarinda_hentzi. While we are fully aware of the pitfalls of making decisions based on abdominal size (thanks Jeff), the relatively large abdomen suggests a female (both male and female S_hentzi have enlarged palps). The lack of a developed epigynum suggests a subadult if it is a female. The small chelicerae may be related to age or gender, but an adult male is ruled out. While we had decided that this brown specimen is S_hentzi, we had completely overlooked this possiblity with this previously uploaded series of a black specimen. Dennis Haines has kindly provided the ID with which we concur. The size, relatively small abdomen and large chelicerae of this black specimen suggest an adult male.
There are a couple of interesting differences between the two. Black: oval shaped carapace and small hardly visible spinnerets. Brown: carapace more parallel-sided and larger clearly visible spinnerets. Perhaps gender related?
ID confirmation/correction appreciated. Any comments on our further speculations would be most welcome. Obviously we are still trying to learn.