QUOTE(GT4671 @ Apr 27 2008, 12:05 PM)
I ask again....what is a "chop" when you are referring to a spider? mindstorm AKA Adrian, this picture is what I saw a lot of in New York.

Obviously this is a female and the males have the same white color pattern on them, but their butts are smaller. I also saw jumping spiders with orange spots.
There were some discussions on what "chop" is in the earlier pages. Nobody knows for sure what it really is. It's a marked behavioral change some Thiania bhamoensis spiders take on in their adult lives. The term "chop" is a colloquial jargon we use, for lack of a better term. The chop Thianias display hyper aggressive behavior towards other Thianias, often treating them like prey rather than competition. The males, curiously, will lose their ability to mate with a female after acquiring this "chop" attribute...they seem extremely timid around females, easily disinterested and if they decide approach they would end up pushing the female (like a face to face fight) rather than mounting her. It's like they messed up their brains.
I have proposed that it may be a CNS infection (something like rabies) because it can be spread around, and now, some documentation that they can recover from it on rare occasions.
Here are some old clips that display the difference in behavior.
Nonchops (normal behavior for Thiania bhamoensis):
Spitfire vs HadesBighead vs ArchillesBoth spiders initially size each other up before fighting...they'll dance side to side and back and forth while showing angry faces. They will then start by pushing each other, vibrating their claws. If none of the competitors give up, they'll go the the next stage of the fight which is grappling. That's when you'll see moves like arm locking, biting and throwing. With successive stages of the fight, the risk of injury increases. In essense nonchop Thianias do not get hurt easily when they fight because they often will give up after stage 1 (angry face faceoff) or stage 2 (pushing).
Chops:
The last few weeks most of the clips involved chop fighting spiders, as Viper and Mindstorm have either caught them or converted them. You have commented on some of the brutal ones that ended up with a competitor dying.
Kelapasawit vs Bro1 slo moBro1 as a chop. Note how the fight began. It went straight to stage 3. That's why injuries often happen in fights involving chops. They do not assess their opponent's size and try to scare them off. Depending on the level of "chopness", a chop spider may or may not show an angry face. It's basically a take-no-prisoners approach to fighting. However it doesn't mean that chops are hands down winners because if the opponent could withstand the initial rush attack, it's a 50-50 tussle.
Hope that helps.
The pic looks like a Phiddipus. I haven't seen any of them here, unfortunately. I saw some crab spiders and wolf spiders while weeding yesterday, quite boring.