yep, definitely trilineatus, the chances are fish labelled as "julii" in your regular LFS are trilineatus, 99% of the time, julii are very rare and extremely hard to come by, and the only chance you would have of finding them would be via a specialist corydoras shop or breeder. But as well as basing the identification on chance, c.trilineatus and c.julii have appearance differences, you will notice that trilis' marking are a series of very dark, almost black squiggly lines, some going all the way across or along the body, it differs between fish, wehereas julii, are much more spotty as opposed to liney, and the colour of the spots ia usually a lighter colur, more of a brown.
hope this helps for future reference.