I found a good reference for Cryptes baccatus, but it only mentions Acacias as a host: http://www.saveourwaterwaysnow.com.au/01_cms/details_pop.asp?ID=918
I think these may be eggs of some entirely different insect, perhaps a heteropteran bug. The apparent small size and the way they are all crammed together on a limited section of stem suggests this.
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