  We give an equivalent definition of Devaney chaotic semiflow in terms of
eventual sensitivity, the notion recently introduced by C.~Good, R.~Leek, and
J.~Mitchell. As a consequence, we prove a version of Auslander-Yorke dichotomy
for the case of not necessarily compact phase spaces. Finally, we raise some
questions about the relation between Devaney chaoticity and the notion of
topological sensitivity, which was recently introduced by C.~Good and
C.~Mac\'ias.
