By subadult, do you mean penultimate? How can you tell? I'd like to know for myself. I assume it must be female, since the palps aren't enlarged. Thanks!

BTW, if you're G.B., we met at the Ohio AAS meeting. I was your collecting sidekick.

I suspect G.B. identified it as subadult by a process of elimination. Younger Phidippus are generally yellow or yellowish brown, but begin to approach their true colors in the subadult phase. The specimen in your photographs is clearly not a mature female (no visible epigyne) and not a mature male (small pedipalps and chelicerae). Thus it is probably a subadult.

I have a similar looking subadult Phidippus that I collected in Austin earlier this year. I believe it is P. cardinalis (as I suspect yours is). I'll post it to bugguide as soon as it matures along with the immature and subadult photos.