Here's links to Rick West photos of both G. aureostriata and E. campestratus: http://www.birdspiders.com/archive/1/0165.htm http://www.birdspiders.com/archive/1/0123.htm
If you open the two Rick West photos with the photo in this thread in different windows and do a back and forth from one to the other The T in question does seem to be E. campestratus. We compared the photo to our male E. campestratus and the T in question does seem to be that. I would have to agree with Jill, of course she is my wife but nonetheless.
I still feel that is is a chaco and here's why. If you will notice on both my pic and Ricks E campestratus has a faded rear half of the ceph that has a chalky look to it which althought chacos can get that somewhat they don't get to the degree that campestrautus does. Also the striping on campestratus while it can have a yellowish tinge doesn't get that mustard look that a chaco does.
The T in the pic while the color may be off does not have the faded ceph that campestratus has. That along with the legs having more of a whitish look to them has me still thinking chaco. Also if you look at the ceph of both species in both sets of pics you can see the triangle shape near the eyes on the chaco where this isn't noticeable on the campestratus. The species do look somewhat similar but the T in question is a chaco.
for what it's worth, i also agree, G. aureostriata. it seems very obviously a Chaco Golden Knee to me anyway.
is this your T? nice. i have a very small Chaco that i got as a freebie currently, i am really looking forward to it getting that size. he's a cutie right now, more goldish and black with little fluffy legs.
It's G. aureostriata. E. campestratus are easily ID'd because of the swollen tibia IV. Your G. aureostriata does not have swollen tibia IV and cannot be an E.campestratus. The only genera in the subfamily Theraphosinae to have swollen tibia IV are Eupalaestrus and Crassicrus. Hope this clears it up.
The reason for less yellow is most likely time after molting as the one in my pic is freshly molted. Also the male I have seen ( grand total of one ) had thinner stiping than the females. There is also some variance between individuals.
The photo I took was just a couple of days after molting. There is a huge difference in color between mine and yours. I wonder if mine is a male? It was supposed to be a female. Maybe as it gets older, it will get more yellow after molting.