Pierine Butterflies of the Genus Dercas. 483 



in 1866 that B. WalUchu "has been for years confounded 

 with a smaller insect described last year by Mr. F. Moore," 

 this species being G. zaneha probably. 



5. Dercas decipienSj sp. n. 



Hah. Khasi Hills. 



Expanse. — ^ 2'2-2"4 inches. 



Description. — Male. Differs from both sexes of D. Wal- 

 lichii, Doubleday, in the absence of the large round spot 

 placed in the middle of the second median interspace of the 

 fore wing, touching the second and third median nervules, 

 and which is black above and reddish below ; in all other 

 respects the two species are the same. 



I have this species only from the Khasi Hills, where it 

 appears to be quite as common as D. Walh'chii, Doubleday, 

 the Rev. Walter A. Hamilton having kindly sent me many 

 examples of both from thence, obtained by his native col- 

 lectors. As they occur synchronously, one species cannot be 

 merely a seasonal form of the other. 



6. Dercas diflhrmi's, sp. n. 



Dercas Wallichii, Leecli [nee Doubleday], Butt, from China, Japan, and 

 Corea, vol. ii. p. 445, pi. xxxv. fig. 3, male (1893). 



Hah. Western and Central China. 



Expanse. — (^ 2'5 inches. 



Description. — "Chinese specimens of D. Wallichii^ Double- 

 day, are rather larger than those from India. In the male 

 the costa towards the apex is marked with red, and there is an 

 oblique streak of the same colour, interrupted by the nervules, 

 from the apical black patch. The underside is identical with 

 that of Indian specimens of the same sex. The females 

 from both countries are alike. Fairly common throughout 

 Central and Western China at moderate elevations ; the 

 female is scarcer than the male." {Leech^ I. c.) 



Mr. Leech described this species as above, but compared it 

 with D. Wallichii, which has the round spot in the second 

 median interspace of the fore wing on both surfaces, which 

 spot is entirely absent from D. difformis and D. decipiens, 

 mihi. From the male of the latter species it differs in the 

 male in having the apex of the fore wing much less produced, 

 in the presence of a rich orange suffusion within the black 

 apical area of the fore wing on the upperside, and also of an 

 oblique discal orange fascia running from the apex of the 

 wing to the first median nervule. In size it is rather larger 



