167 



some undescribed rhopalocera from siam. 

 By 



N. D. Riley, f.z.s., f.e.s. and E. J. Godfrey, b.rc, f.e.s. 



With 4 Plates. 

 The following descriptions of Butterflies, obtained mainly 

 since the publication of Godfrey's " Butterflies of Siam " in this 

 Journal of 1916, are issued as a preliminary to a revised list of 

 Siamese Butterflies which it is hoped to publish before long. The 

 whole of the material collected up till March 1920 has been over- 

 hauled afresh, so that it is hoped that any errors which may have 

 crept into the first list will be rectified in the next. 



Most of the new forms, it will be noticed, are from the 

 Me Song forest, N. Siam, a few from S. E. Siam, and one only from 

 Peninsular Siam. One interesting fact has been frequently brought 

 out in going through the collections, namely, the considerable 

 difference between the fauna of Northern and Western Siam and that 

 of S. E. Siam. Of the forms described below, only one (Allot inus 

 posidion) of the five from Eastern and S. Eastern Siam has been 

 met with in any form in North and West Siam so far, nor have any 

 of those described from the Me Song forest, with the exception of 

 Penthema binghami mimetica, been met with in any other part of 

 Siam. It is hoped soon to draw up a table shewing the distribution, 

 so far as ascertained, of the Butterflies of Siam, using the divisions 

 adopted in the previous paper, when the very real faunistic differences 

 of thesa areas will be more obvious. 



All the Types of the forms here described as new, as well as 

 the Types of those described in the previous paper have been pre- 

 sented to the British Museum (Natural History), together with a 

 short series of practically every species so far obtained in Siam. 



We take this opportunity of figuring the following forms 

 already described in the previous paper in this Journal : — 



Gerydu.s ancon siamensis Godfrey. (Plate V, figs. 8 and 9.) 



Terinos terpander intermedia Godfrey. (Plate VII, figs. 2 and 3.) 



Everes rileyi Godfrey. (Plate VII, figs. 4 and 5.) 



Hestia leucoxoe siamensis Godfrey. (Plate VII, fig. 6.) 



and also 



Thauria lathyi siamensis Rothschild. (Plate VII, fig. 1.) 



VOL. IV, NO. 3, 1921. 



