MARIUS THETIS. 
PLATE XIX. Fig. 1 *. 
Pap. Thetis, Fair. — Nymph. Thetis, Godart Pap. Petrena, 
Cramer , PI. 87, fig. D, E ; Stoll's Sapp. PI. 2, fig. 2, A, 
(caterpillar), fig. 2, B, (chrysalis) ; Swainson's Zool. Him. 
Pis. 59 and 110. 
This singular looking insect is distinguished gene- 
rically by the peculiar shape of the wings, and the 
equally remarkable appearance of the caterpillar. 
Of the former the posterior edge of the primary pair 
is concave, and the apex is distinctly truncated ; the 
same edge of the secondary wings has two long 
linear tails, the anal one shorter and curved out- 
wards, the external long, obtuse at the extremity, 
and turned somewhat obliquely outwards. The 
caterpillar is naked, with four long fleshy filaments 
on the hack, and two others projecting from the 
hinder part of the head; the chrysalis likewise with 
several projecting filaments. 
The Marius butterfly is a native of Guiana and 
Brazil. The colour of the upper side is tawny, vary- 
ing somewhat in the shade according to the sex, 
* On tlie Plate the under figure should have been marked 
1, the upper 2. 
