RUOVALOCKUA .V.I/,,1 )M.V.l. 801 



directed inwardly. Body moderately robust ; pronotum hairy ; palpi lonp;, porrect, prnjectiiif; beyond 

 the head, the second joint very longly hirsute ; antennic moderately long, with a short but well-thickcncd 

 apical club ; legs long and slender. 



The position of the first and second subcostal nervules of the anterior wind's have 

 compelled the erection of a new genus for the reception of the Pierk njiiis, Hcwits. Udaiana 

 has a superficial resemblance to some species of Ajipias and Belenois, and with the last genus 

 it has been sometimes incorporated. 



1. Udaiana cynis. (Tab. XXVI., tigs. 5 <? , 2 .) 



Pieiis ci/nh, Hewitsou, Ex. Butt. iii. Pier. t. 8, f. 54 (186(5); Wall. Traus. Ent. Soc. scr. iii. vol. iv. p. :-Ul, 



n. 41 (1867). 

 Phris.furii ci/nis, Butl. Cist. Eut. vol. i. p. 49 (1870). 

 Beli'Hiiis cynis, var., Butl. Traus. Ent. Soc. 1871, p. 171. 

 Belenois ci/nis, Butl. Traus. Linu. Soc. ser. 2, Zool. vol. i. p. 551, n. 1 (1877). 



Male. Wings above pale greenish-white ; anterior wings with the basal half of costal area dark 

 greyish, speckled with black; remainder of costal area, the apex— broadly — and the outer margin — 

 angulated internally — black; posterior wings with some small black spots on outer margin. Anterior 

 wings beneath as above, but with the black markings paler ; posterior wings beneath without the black 

 marginal spots. Body above fuscous, beneath with legs more or less concolorous with wings. 



Female. Anterior wings above fuscous, with an outer discal curved fasciate series of large whitish 

 spots ; posterior wings above greyish-white, with the base and outer marginal area fuscous. Anterior 

 wings beneath as above, but with the white markings rather larger ; posterior wings beneath as above, 

 sometimes with a faint central transverse narrow fuscous fascia. 



Exp. wings, ^ and ? , 50 millim. 



Hab. — Malay Peninsula ; Perak (Kiinstler — Calc. Mus.) ; Malacca (Pinwill — Brit. ^lus. ; Biggs— coll. 

 Dist.) ; Ayerpauas (Godfery— coll. Dist.). — Sumatra (Hewits.). 



This species has a close ally in North Borneo, of which I append description." 

 The dissimilarity of the sexes iu this species affords a good example of what is generally 

 found more or less throughout this subfamily. Mr. Darwin, as is well known, sought the 

 explanation in his theory of " sexual selection." Dr. Weismaun, on the contrary, considered 

 the formation of these secondary sexual characters to be " due in great part to the difference 

 of physical constitution between the sexes." f 



- Udaiana pryeri, u. sp. Male.— Wiugs above closely resembling those of U. cynis; anterior wings beneatli with the 

 basal costal area somewhat broaai>- fuscous; posterior wings beneath with the basal fourth also fuscous, and with some 

 indistinct narrow discal fuscous markings. 



Esp. wings, 55 millim. 



Hab. — Borneo; Sandakan (Pryer). 



t ' Studies iu the Theorj' of Descent.' Eng. transl. p. 02. 

 June 20, 1885. •* " 



