PONTIA. 53 



The fossil consists of both anterior wings, one beneath and slightly in advance of 

 the other, thus complicating very greatly the study of the already indistinct 

 neuration; in addition to this the wings are crumpled and additional longitu- 

 dinal lines are present, scarcely distinguishable from the longitudinal nei-vures. 

 On this account it should be stated that there may be some doubt about the exact 

 position of the lowest three branchlets of the subcostal nervure. The stone has 

 been broken next the edge of the wing, and its form can thus be traced where 

 the real border is wanting, although again the drawing presented may be slightly 

 inaccurate next the inner margin ; but the probabilities are great that it is correct 

 throughout. The spots which are represented on our plate in the middle of the 

 lower median, subcosto-median and lower subcostal interspaces, are only irregu- 

 larities of surface on the stone, but as they appear in regular position are not 

 improbably dark spots, upon a light ground. A few points for the insertion 

 of the scales can be detected near the apex of the wings, •075"""- apart. The 

 neuration of the fossil agrees better with that of Delias Pasithoe than with 

 that of any other butterfly I have examined. Length of wing, 21"""-; greatest 

 breadth, 9"""-. 



Tertiaries of Aix, Provence, France. Collection of Count de Saporta. 



PAPILIONID^ — D ANAl — VORACIA. 



PONTIA Fabricius. 



Pierltet Hkkr, Insekt. Tert. CEning., li, 182; Ib., Nouv. Mem. Soc. Helv., xi, 182; Gieb., Faun, der Vorw., 

 il, 187. 



Fore wings fully three-quarters as long again as broad, the costal margin 

 slightly convex at the basal and apical fifth, scarcely bent at an angle with the nearly 

 straight middle portion, the outer angle abrupt but softened. Outer margin nearly 

 straight and inclined at an angle of forty-five degrees with the middle portion of 

 the costal border, above the middle subcostal uervule receding slightly in a gentle 

 curve. Inner margin straight, the outer angle well rounded. Costal nervure ter- 

 minating a little beyond the middle of the margin. Subcostal nervure with three 



ME.MOIRS A. A. A. 8. 9 



