R HOP A L 0 CERA MA LA YANA. 



301 



directed inwardly. Body moderately robust ; pronotum hairy ; palpi long, porrect, projecting beyond 

 the bead, the second joint very longly hirsute ; autennrc moderately long, with a short hut well-thickened 

 apical club ; legs long and slender. 



Tlie position of the first and second subcostal nervules of the anterior wings have 

 compelled the erection of a new genus for the reception of the PieHs vijuis. He wits. Udaitwa 

 has a superficial resemblance to some species of Appias and Beienoh, and with the last genus 

 it has been sometimes incorporated. 



1. Udaiana cynis. (Tab, XXVI., figs. 5 tf, 6 ? .) 



Pieris cj/n/* T Hewitson, Ex. Butt. iii. PUr. t. 8, f. 54 (I860); Wall. Trans. Ent. Hoc. ser. iii. vol. iv. p. H\\, 

 n. U (1S07), 



Phrmuni eyni* t Bntl. Cist. Eot, vol. i. p. 49 (1870). 

 ttetenoU cyni#, var,, ButL Trans. Ent. Soc. 1871, p. 171. 



HelmaiA ajtri*, Bntl. Tjanti, Linn. Soc. ser. 2, Zool. vol. L p. 551, n. 1 11677). 



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

 greyish, speckled with hlack; remainder of costal area r the apex— 1) road ly— and the outer margin — 

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

 wing* hriii'Msli us abow. but with 1 1 1 Mark uuirkin^s paler ; posterior wings beneath without tlie hlack 

 marginal spots. Body above fuscous, beneath with logs more or less coneolorous with wings. 



Female.- Anterior wings above fuscous, with an outer iliseal 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, hut with the white markings rather larger; posterior wings beneath (is above, 

 sometimes with a faint central transverse narrow fuscous fascia. 



Exp. wings, (f and ? , 50 millim. 



Hab.— Malay Peninsula ; Perak (Kimstler — Calc. Mus.) ; Malacca fPInwill— Brit. Mus.; Bigg?— 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 in this species affords a ^ood 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. 11 Dr. Weismann, on the contrary, considered 

 the formation of these secondary sexual characters to be 44 duo in <jrcat part to the diiVerence 

 of physical constitution between the sexes/' f 



" : Utlaittna jyrycru n. ep. Malt-. — \Vin™s above closely resembling those of U. cynis; anterior wings beneath with lb* 

 basal costal aim somewhat broadly lust-mis:; ji.»sic-i-j.ii- w'njfia Imnutfli with the basiil loiirtli :ilsu lupous, and with some 

 iiidwlinut tuirrow dincnl fuscous tuarkiiij^s. 



Exp. M injjM, AS mi 11 im. 



Hab, — Borneo; Saiidak&n (Pryen. 



« 1 Studies in the Theory of Dc-BceriL,' En«. trniul. p. G 4 2. 

 Jink "JO. 



I u 



