On the Expectations for Leptoquarks in the Mass Range of O(200 GeV)

A summary is given on the experimental bounds for the couplings and masses of scalar and vector leptoquarks associated to the first fermion generation. We investigate to which extent an interpretation of the recently reported excess of events in the large $x$ and $Q^2$ range at HERA in terms of single leptoquark production is compatible with other experimental results.