218 Mr. A. G. Butler on Peruvian Lepidoptera. 



been so well described by previous observers, that I shall con- 

 tent myself with simply pointing out a few of the more impor- 

 tant peculiarities in the present specimen. 



The slit in the anterior part of the trachea is caused by the 

 deficiency of ten rings in front. The right lip of the slit has 

 eleven cartilaginous elements, the left only ten. The extra or 

 eleventh cartilaginous element is owing to a small bar of car- 

 tilage being attached to the lower border of the right half of 

 the uppermost incomplete ring. This corresponds somewhat 

 curiously with the adult male and adult female of Dr. Murie's 

 dissection {vide P. Z. S. 1867, p. 409). In his specimens the 

 lowest incomplete ring bifurcated ; in my specimen it was the 

 uppermost incomplete ring, but it did not bifurcate. 



As regards the number of incomplete rings my specimen 

 agrees with that described by Mr. Robert Anderson (quoted 

 by Murie, I. c. p. 407). 



The sac markedly springs from the lips of the fissure, 

 and is evidently continuous with the elastic band intervening 

 between the cartilaginous rings. Its walls were composed 

 chiefly of the white or areolar tissue, but with much of the 

 yellow variety diffused through it. 



In Dr. Murie's adult female bird there were certain band- 

 like duplications of the wall of the sac partially dividing it ; 

 in my specimen these were not present, the sac being simple 

 and undivided. It may further be remarked of the latter that 

 there was no cul-de-sac at the left upper end ; but otherwise 

 the general form agreed with that figured and described by 

 Dr. Murie. 



I am rather inclined to take exception to the close nature of 

 the homology between it and the air-sac of the chameleon. 

 In the Emu we nave undoubtedly a tracheal pouch ; in the 

 chameleon it may be regarded more as a laryngeal pouch. 



The specimen herein commented on is preserved in the 

 Liverpool Free Library and Museum ; and I may mention 

 that I am indebted to the courtesy of the curator, T. J. Moore, 

 Esq., for permission to examine the bird. 



XXIX. — List of Lepidoptera in a small Collection sent from 

 Peru by Mr. Whitely, with Descriptions of the new Species. 

 By Arthur Gardiner Butler, F.L.S., F.Z.S., &c. 



The present collection was made at Huasampilla, 9000 feet 

 elevation. As regards the butterflies it is decidedly peculiar, 



