MAY. 123 



under side, the nervures are strongly marked with a line of 

 dingy green ; the upper wing having two black spots near 

 the hinder margin. The caterpillar is dull green, covered 

 with white raised spots, blackish at the tip, and tufted with 

 short hairs ; the perfect insect is very common, and presents 

 many variations in size and markings. 



PONTIA SABELLIC^;. Dusky-veined White. This is con- 

 sidered by many writers to be merely a variety of the P. napi, 

 and indeed the only difference seems to consist in the colour 

 of the nervures. 



LEPIDOPTEBA. 

 POLTOMMATUS. 



Generic Distinctions. Antenna short, with a compressed club; 

 i a little longer than the head ; wings entire ; colour blue, 

 but dissimilar, the females being generally brown ; size small. 



POLYOMMATUS ALEXIS. (Plate IX.) Common Blue. This 

 very pretty insect is bright lilac-blue in the male, the hinder 

 margin edged with black; the anterior edge of the upper 

 wings white ; the female is brown, powdered with blue 

 towards the base of the wings, sometimes the surface is en- 

 tirely purplish-blue, and ornamented with a darkish band, 



