An insect at the Reserva Ecológica de Buenos Aires. After looking at the list at the reserve's website, I think it is <i>Agraulis vanillae maculosa</i>.
<a href="//commons.wikimedia.org/wiki/User:Mx._Granger" title="User:Mx. Granger">Mx. Granger</a>
<span class="int-own-work" lang="en">Own work</span>