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Phidippus audax
Even without the chelicerae, I'm going to offer up the i.d. These guys are fantastic! You can also recognize them by body shape and the "face" on their back - not to mention the attitude of a spider 10,000 times their size! Really good job showing his body shape! They're boxy and black, so even though they'll pose, they can be hard to focus on. :)
Did this little guy have green mouthparts? Also, you can edit the spotting and move it to Arthropods instead of the Other category.