Ivlr. A. G. Butler on new Species of Butterflies. 397 



androgynous ; but they are perhaps more nearly allied to Gas- 

 teropteron or the Bullidce. The systematic position seems to me 

 not sufficiently clear. 



The relation between the pulmoniferous Auricula with a marine 

 larva and the marine branchiferous Pyramidella requires further 

 observation. Quoy and Gaimard have pointed out their affinity. 



The relation between a rostrum (not retractile) and a proboscis 

 or haustellum (retractile) is not yet sufficiently understood. 

 Perhaps there is no other difference than between a long and 

 short siphon. Strombus appears to make a transition between 

 the two, and seems to approach most to Ctjpraa. 



XLIII. — Description of four new Species of Butterflies in the 

 Collection of the British Museum. By A. G. Butler, F.Z.S., 

 Assistant, Zoological Department, British Museum. 



1. Anthocharis Leo. 



Upperside — front wings snowy-white, with a pale orange patch 

 on the inner margin, bounded above by the third median ner- 

 vule ; base greyish; apex and a subapical line grey; nervures 

 black : hind wings snowy white, suffused with orange on the 

 front margin. 



Body grey ; head and prothorax yellowish. 



Underside white, tinted with ochreous, darker at the apex of 

 front wings and front margin of hind wings ; a curved line of 

 small indistinct brown spots crosses the hind wings just below 

 the middle. 



Expanse of wings 1 inch 9 lines. 



Hab. White Nile. 



2. Danais Mariana. 



Upperside — front wings, basal half, an irregular subapical band, 

 a small spot on the costa just beyond the middle, and two mar- 

 ginal spots between the median nervules sap-green ; apical half 

 and nervures rich brown, its inner outline angularly and irregu- 

 larly notched : hind wings, basal half sap-green, tapering to- 

 wards the termination of the upper disco-cellular nervule, with 

 an angular and irregular outline ; apical half and inner marginal 

 nervures rich brown ; other nervures reddish. 



Body brown; head reddish, spotted with white; antennae 

 black. 



Underside — front wings as above, but with three additional 

 small marginal green spots and paler-coloured nervures; hind 

 ivings as above, but with two submarginal rows of pale-green 

 spots placed in fours between the nervures along the hind mar- 

 gin, and the nervures margined with brown. 



