Abstract : Liskovets and Walsh recently counted bipartite eulerian planar maps, that is embeddings of planar bipartite graphs with all vertices of even degrees. In this note we present a simple one-to-one correspondence between the latter and the 4-eulerian maps enumerated by Bousquet-Mélou and Schaeffer (\emph{Adv. Appl. Math.}, 2000). A bijective enumeration then follows.
