Title: Categories of graphs and trees

  Abstract: I will present some new formalisms for Feynman graphs and
  trees, motivated by operad theory, but expected also to be of
  interest in quantum field theory and related subjects.  One feature
  is the ease of dealing with decoration and local structure, like for
  example graphs for a particular quantum field theory, ribbon graphs,
  bipartite graphs, etc.; binary trees, planar trees, or trees
  decorated by primitive 1PI graphs.