Dr. G. B. Longstaff's Bionomic Notes on Butterfiies. 659 



hind-wings, which are folded closely under it, but the anal 

 prolongation of the wing is everted at right angles, as in 

 the lobed Lycsenids, and as in their case the ocellus may 

 be seen from above. In every case in which I noted the 

 butterfly at rest it was upon the ground, so that I do not 

 know whether it ever adopts the inverted attitude and is 

 protected by a " false head." But whether that be so or 

 not the approach to Lycsenid structure in a Satyrine is 

 interesting. 



At first I thought that the eversion of the lobe in 

 C. zangis might be due to the pressure of the curved sur- 

 face of the pill-box in which the butterfly was confined, 

 but subsequently was abundantly convinced that such is not 

 the case, for when the butterfly rests on a flat surface with 

 which the wing does not come in contact it is everted just 

 the same. 



There is a well-developed lobe in the Oriental and 

 Ethiopian Nymphaline genus Cyrcstis, while the allied 

 Neotropical genus Megahira has a somewhat similar 

 structure (pointed out to me by Prof. Poulton), but I am 

 not aware that the bionomic significance of these has as 

 yet been worked out. 



The fine large blue-grey Nymphaline Peridi'omia feronia, 

 Hlibn., is a strong flier, which has the unusual laabit of 

 settling upon tree-trunks, usually choosing palms with 

 silvery-grey stems. The butterflies harmonise wonderfully 

 with the silvery-grey stems as they sit with wings fully 

 expanded like Geometers, but always head doiunwards as 

 noticed by Darwin in Brazil.* When disturbed they will 

 return to the same tree again and again. I met with this 

 species at Colon, La Guaira and Trinidad, and noticed 

 these points on each occasion. 



Another large Nymphaline which appears invariably 

 to sit head downwards is Aganisthos orion, Fabr., of which 

 I saw several in Jamaica. The favourite resting-place 

 seemed to be the trunk of a logwood tree, HiemcUoxylon 

 cavipeachianum, Linn., from 1 to 4 feet from the ground. 

 This species rests with its wings closed above its back, and 

 although the underside is cryptically coloured, the butter- 

 fly may be seen from a considerable distance when in 

 profile. 



* "Journal of Researches," etc., ecln. 1860, p. 33. Compare W. J. 

 Burchell's observations (1825 — 1836), quoted by J. C. Monlton, Ann. 

 Mag. Nat. Hist., Ser. 8, vol. ii, August 1908, pp. 184-7. 



TRAJJ3. ENT. SOC, LONP. 1908. — PART IV. (jAN. 1909) 43 



