PONTIA. 151 



has the upper surface of all the wings of a yellowish-white, with 

 broad dusky irrorated nervures, broadest towards the hinder 

 margin. The male has the base of the anterior wings and a 

 single irregular spot in the fourth marginal cell dusky. The 

 female has the base and tips of the same wings, a spot in the 

 fourth and sixth marginal cells, and the inner edge of the wings 

 of the same colour. Both sexes have a similarly- coloured spot 

 on the upper margin of the posterior wings above. Beneath, 

 all the wings are adorned with very broad dusky nervures, 

 . . . varying in different specimens, and the dilated 

 nervure on the upper edge of the discoidal cell is destitute of 

 the insulated yellow spot which every specimen of P. napi 

 that has passed under my examination possesses" (Stephens). 



GENUS PONTIA. 



Politicly Fabricius, in Illi r er, Mag. Insekt. vi. p. 283 (1807) ; 



Curtis, Brit. Ent. i. pi. 48 (1824). 

 Synchloe, pt. Hiibner, Verz. bek. Schmett. p. 94 (1816) ; Kirby, 



List Brit. Rhop. p. i (1858) ; Butler, Cist. Ent. i. pp. 38, 



51 (1870); Schatz, Exot. Schmett. ii. p. 61 (1886). 

 Mandpiunit pt. Stephens, 111. Brit. Ent. Haust. i. p. 22 (1827); 



Duncan, Brit. Butterflies, p. 124 (1835). 



Antennae with a well-marked club ; sub-costal nervure with 

 only three branches ; lower disco-cellular nervules much 

 straighter than in Piet is ; wings white, the hind-wings marbled 

 with green beneath. 



A small genus, almost confined to Europe and Northern and 

 Western Asia. One species, P. callidice (Esper), is a thoroughly 

 mountain form, reaching the height of 8,000 feet in the Alps, 

 and 16,000 in the Himalayas. It may be known by the dull 

 green colour of the hind-wings beneath, with white sagittate 

 spots. 



