I am not an ant specialist, but I did some searching on the internet and found this article that might have what your looking for.
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Atta Cephalotes stridulate during the cutting of leaf fragments by raising and lowering their gasters, so that a cuticular file located on the first gastric tergite is rubbed against a scraper situated in the postpetiole.
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Source:
http://www.jstor.org/pss/4601267