M. p. portis Hübner according to von Bönninghausen is never found in the plains, but only at higher elevations of the Sierra Geral, as at Petrópolis and Novo Friburgo in the state of Rio de Janeiro, where it is by no means common.

The upper surface differs from that of the southern branch-race in its unusually delicate light blue color, shot throughout with glossy reflections, and which only distally darkens somewhat towards violet.

Catharina, but common in suitable localities (timber forests overgrown with bamboo and intersected by large rivers), M. p. thamyris flies chiefly in the afternoon from 3 to 4 o'clock, when M. anaxibia is already disappearing into the shade of the woods.

The butterflies fly slowly, scarcely 1 to 2 meters above the ground, and are fond of resting with closed wings on bamboo twigs.

Also on the high lying country of Lages I met with M. p. thamyris in the damp woods of the valleys and the primeval forests on the Alto Uruguay.