  We study the properties of vectorlike fermions that have the same gauge
charges as the Standard Model lepton doublets, but opposite lepton number.
These antileptons undergo decays mediated by heavier scalar leptoquarks, while
the symmetries of this renormalizable model protect the vectorlike fermions and
the leptoquarks from standard decays probed so far at colliders. If the new
particles couple predominantly to second-generation quarks, then their collider
probes involve multiple jets and two taus or neutrinos, and are hampered by
large backgrounds. If couplings to third-generation quarks are large, then the
collider signals involve top quarks, and can be probed more efficiently at the
LHC. Even in that case, both the vectorlike fermion doublet and the leptoquarks
remain more elusive than in models with standard decays.
