BRAZILIAN LEPIDOPTEHA. 41 



ence in colouring does not appear to be sexual. Specimens 

 taken in April, 1878, were full-fed on the 20th of that 

 month. 



p^p^ (a, Full-fed, April 23; Imago, May 14, 1878 = 21 

 . 1 days. 



When full-fed the caterpillar attaches itself by the "tail " 

 and a loop round the thorax to a twig or other suitable 

 object, and next day changes to the chrysalis. The chrysalis- 

 is generally of a pale opaque greenish colour, with the veins 

 of a lighter shade and tinged with yellow. Two of my 

 specimens, instead of being green, were of a beautiful purplish 

 pink, the veins being of the same colour as in the green 

 specimens. This difference of colouring is not sexual, for 

 one of the specimens was a male and the other a female. 

 (See fig. 9, plate IV.) 



(a, $ Full-fed, April 23 ; Imago, May 18, 1878 = 25 



days. 

 h, (? May, 1878. c, ? June 4, 1878. 

 d, ? Full-fed, April 24 ; Imago, May 18, 1878 = 

 24 days. 



The butterfly appears about three weeks after pupation. 

 After emerging they remain a long time without attempting 

 to fly. I have observed specimens that did not leave the 

 spot for five days, remaining perfectly still all the time. 



Imago. 



Subfam. Papilionince. 



XXXI.— Papilio Thoas. 



Papilio Thoas, Linn. Mant. Plant, p. 536 (1771), Drury, 

 Illust. Exot. Ent. i., pi. 22, fig. 1, 2 (1773). Cramer, 

 Pap. Exot. ii., pi. 167, fig. a. b. 



Ova. 



The eggs are laid singly on the upper surface of the young 



