Harvestmen are also arachnids and are also know as "daddy-long-legs"(Order Opiliones). They prey on insects and other arthropds but are also scavengers and drink plant juices.
Once, about 30 or so years ago, when the spouse & I were living in a ground-floor apartment in Richmond, Va., we saw a harvestman patrolling our back porch area. Because it was dinnertime, the wife put a grain of hamburger from the (cooked) spaghetti sauce out on the cement, and would you believe the harvestman came by, picked it up and walked off with it? My jaw nearly hit the floor.