Mr. A. G. Butler on the Variation of Cyllo Leda. 51 



length ; the first emitted at a short distance from the origin of 

 the first subcostal branch, the second uniting with the median 

 nervure at the origin of the second and third median nervules. 



Body. Thorax short, hairy ; head hairy ; antennae very slen- 

 der, with scarcely perceptible club, about half the length of the 

 front wings ; fore legs small, especially in male. 



Anadebis Himachala, PI. II. fig. 1. 



Theope {Mycalesis'i) Himachala, F. Moore, Cat. Lep. Mus. E. I. C. i. 



p. 234 (1857). 

 Ethope Himachala, Moore, Proc. Zool. Soc. p. 770 (1865). 

 Neorina Sita, Felder, Wien. ent. Monatsehr. iii. p. 403 (1859), 



Hab. Darjeeling (Moore). Sylhet. B.M. 



This genus must be placed next to Neorina of Westwood, 

 from which it principally differs in the form of the antennae and 

 the disco-cellular nervures. 



XIII. — Observations on the Variation o/ Cyllo Leda of Linmeus, 



a Species of Satyride Lepidopteron ; and on the different forms 



of that Insect in the National Collection. By Arthur G. 



Butler, F.Z.S., Assistant, Zoological Department, British 



Museum. 



Amongst all the exotic Butterflies, I have met with no species 



that exceeds Cyllo Leda in variation of form, pattern, and 



coloration. The common Diadema Lasinassa, though subject 



to great diversity of marking and ornamentation, diff'ers but 



little in the general outline of the wings ; of C. Leda, on the 



contrary, we find specimens in which the entire character of the 



insect is changed in consequence of the falcation or non-falca- 



tion of the apices of the front wings. 



This extraordinary variability has naturally had the efi'ect of 

 adding considerably to the synonymy of this species : amongst 

 other forms, C. Helena of Westwood and C. Banksia of Fabricius 

 must be included. The synonymy of C. Leda will therefore be 

 as under : — 



Papilio Leda, Linnaeus, Syst. Nat. ii. p. 773. n. 150 (1766). 



Oreas {marmorata) Leda, Hiibner, Saraml. exot. Schmett. Band i. pi. 91. 



f. 1-4 (1806-27). 

 Hipio Leda, Ilubn. Verz. bek. Schmett. n. 538 (1816). 

 Satyrus Leda, Godart, Enc. Meth. ix. p. 478. n. 4 (1819). 

 Cyllo Leda, Westwood and Hewitson, Gen. Dium. Lepid. p. 361. n. 1 



(1851). 

 Papilio Solandra, Fabricius, Syst. Ent. p. 500 (1775). 

 Cyllo Solandra, Boisduval, Voy. dans I'Oc^anie (de ' I'Astrolabe *), Ent. 



pt. 1. p. 142 (1832-35). 

 Cyllo Helena, Westwood, Gen. Dium. Lepid. p. 361. n. 2 (1851). 

 Papilio Banksia, Fabric. Syst. Ent. p. 499 (1775), 



4* 



