THE BUTTERFLIES OF SIAM. 117 



It apparently differs from H. v, hippia in the fact that it keeps 

 to the woods and is not found in open country. 



FAMILY— NYMPIIALIDjE. 

 Sub-family — Danain^e. 



74. Hestia leitconoe siamensis, subsp. nov. 



Eesembles H. leiiconoii nigriana Grose-Smith from Borneo. Dif- 

 fers as follows : — The ground colour much paler, the yellow tinge more 

 pronounced. The zig-zag mark crossing the cell of the forewing and 

 the spot below it, in interspace 11, reduced in size ; the spot below the 

 cell, in interspace 2, absent. 



Not uncommon at Nong Khor and Hup Bon in the Sriraoha 

 forest, but apparently not found elsewhere. According to my observa- 

 tions, the butterflies keep mostly to the tops of trees, especially in the 

 early mornings, but the)^ occasionally circle slowly down with clumsj', 

 top-heavy, movements and are then easilj' captured. 

 Types 2d d, 1 2 in the British Museum. 



75. Hestia hadeni W-M. and de N. 



There is a specimen in the British iluseum labelled " Bangkok. 

 Siam," but Frushstorfer says the species is very rare, and has only been 

 found as yet near Bassein at the estuary of the Irawaddi. 



76. Danais plexippus plexippus Linn. 

 Common everywhere all the year round. 



According to Fruhstorfer, intermedia MoORE is a dry season 

 aberration which occurs together with i^lexi^^pus ty2nca, in Siam, Cochin 

 China and Tonkin. 



77. Danais chrtsippus chktsippus Linn. 

 Common everywhere all the year round. 



78. Danais melanippds hegesippus Cr. 

 Widely distributed and fairly common. 



79. Danais affinis malayana Fruhst. 



Taken only on the west bank of the river in Bangkok and at 

 Sriracha. 



The occurrence of this butterfly at Sriracha is of interest. 

 Frushstorfer (1910) writes : " malaijana Fruhst. a highly specialized 

 form almost worthy of specific rank, of which for a decade only <S 



VOL. II, DEC. 1910, 



