2S6 



RHOPALOCERA MALAYANA. 



family suruamed Callidnjas*— are sometimes seized with a mania for migrating to the far 

 West!! .... I have stood near one of the parade-grounds at Poona, and watched them, 

 with scarce a pause to rest their wings or sip a flower, from eight or nine o'clock until the 

 afternoon, as far as eye could reach, the host kept streaming past, like the fugitive Gauls 

 after one of Caisar's great hattles." + 



These interesting facts could be multiplied if our space permitted, and the only reason 

 \vh}- tliey have been thus somewhat amply recorded, is to show, what an interesting, and 

 phenomenal phase of butterfly existence, still requires a scientific explanation. 



In my treatment of the neuration of these Pierince, I am not altogether in unison with the 

 views of my contemporaries Messrs. Butler and Moore, who also differ somewhat in this respect 

 from one another. I only recognise a discoidal nervule, as such, when its basal emergence is 

 distinctly traced from some portion of the end of the cell. Mr. Butler has a contrary opinion, and 

 treats as a discoidal nervule what I consider as a lower subcostal nervule. The genus Delias 

 affords a good example. In this genus Mr. Butler counts three subcostal nervules ; I I enumerate 

 four, the difference being due to a divergence of view as to what is really a discoidal nervule. 

 Here I am supported by Mr. Moore, whose view, however, of this nervule is somewhat capricious, 

 as in Hebomoia he describes five subcostal nervules, § whilst Mr. Butler and myself can see 

 but four. 



Fig. 0''i. — Avranf: 

 in aiitiTiov w 

 tlteiiope. 



;ement of nervules 

 ing of Delias pcw- 



riG.OI. — Ari-an 

 in anterior 

 cijnis. 



jement of nervules 

 wing of Udaiana 



SYNOPSIS OF GENEEA. 



1. Anterior wings with one discoidal nervule. 



A. Anterior wings with four subcostal nervules. 



a. Discoidal nervule of anterior wings emitted near upper end 



of cell. - - - - - - - - - Leptosia. 



aa. Discoidal nervule of anterior wings emitted at middle apes 



of cell. Delias. 



B. Anterior wings with five subcostal nervules. 



b. Upper disco-cellular nervule of anterior wings longer than 



lower. ---------- Prioneris. 



hb. Upper disco-cellular nervule of anterior wings shorter than 

 lower. 

 c. First subcostal nervule of anterior wings emitted at 



about middle of cell. Catopsilia. 



cc. First subcostal nervule of anterior wings emitted beyond 

 middle of cell. 

 d. First and second subcostal nervules emitted some- 

 what close together near end of cell. 

 e. Third and fourth subcostal nervules bifurcating 



near apex of wing. ------ Udaiana. || 



■■■ The writer evidently means the geuias CaUldryas, which is now correctly restrictetl to American species. Hiibner's 

 eariier f^'euus Catopsilia embraces all the Old World species. It is usual to find these butterflies spoken of as " Callidryads" 

 in tlie East ; but it is also common to hear about boa-constrictors, alligators, humming birds, &o., inhabiting the same region ! 



f ' The Tribes on my Frontier,' p. 113. J Cist. Entom. vol. i. p. 55. § Lep. Ceyl. vol. i. p. 127. 



II Gen. nov. type Pieris cynis, Hewits. Mr. Butler (Cist. Ent. vol. i. p. 49, 1870) gave this species as the type of his 

 genus Fhrissura. He subsequently (Trans. Ent. See. 1871, p. 171) stated that this was an error, and that the species " agrees 

 in venation, and in every other character, with the species of the genus Belrnois." But the type of Belcnois, as given by 

 Mr. Butler himself (Cist. Ent. vol. i. p. 34), is the Fapilio Calypso, Dru., a species in which the first subcostal nervule is more 

 or less anastomosed with the costal nervure, a character not applicable to P. cynis, and I have therefore been compelled to 

 erect a new genus for its reception. 



