rAl'lLIONin.K. PONTIA. 19 



superior wings ; and both sexes have two black spots beneath them. The 



under Burface of the posterior wings is of a brighter yellow than in I'o. 



Brassica?, with a deep orange streak on the costa, and it is usually much less 



speckled with minute black dots, the marginal cells being nearly immaculate : 



the cilia are white, slightly sprinkled with dusky at the tip of the anterior 



wings : the body and antennie are coloured as in Po. Chariclea. 

 Var. $. Smaller : male with the apex of the anterior wings, and two spots on 



their upper surface black ; female without the elongate-triangular spot on 



the thinner edge of the same wings. 

 Var. V. Male with a very obsolete spot on the anterior wings : female with 



two obsolete spots above : both sexes with the second spot beneath nearly 



obliterated. 

 Var. 3. Male with the apex of the anterior wings scarcely clouded, the disc 



immaculate ; one spot only on the under surface. 

 Var. E. Male with a deep dusky triangular spot on the apex of the anterior 



wings, extending considerably along the hinder margin, and a cordated black 



one on the disc : two black spots beneath. 

 Exclusively of the above, there are several intermediate varieties in size, colour, 



and in the size and form of the spots. '1 he female is usually yellowish-white 



in all the varieties, some of which approach to Pa. Nelo of Borkhausen. 

 The caterpillar is green, with a paler line on the back, and a whitish line, often 



punctured with yellow on each side : the chrysalis is greenish, spotted with 



black. 



Like Po. Brassicse this species abounds throughout the southern 

 parts of the country, but its larvse feed solitarily upon various kinds 

 of brassica and reseda, upon which the parent insect deposits her 

 eggs singly, and not in clusters, in the same manner as Po. Brassicse : 

 the first brood appears at the end of April ; the second about the 

 beginning of July. 



Sp. 4. Metra. Alls albis hasi nig-ris, anticis supra apice suhne- 

 huloso, subtiis macid'is duabiis, out una, obsolctis nigris, vii im- 

 maculatiSi posticis suhtus Jlavcsccnt'ibus n'tgro irroratis. (Exp. 

 alar. 1 unc. 8 — 11 lin.) 



Pap. alba, minor, immaculata. Petiver, pi. 1. f. 13, 14. — Pontia 

 Metra. Steph. Catal. 



Very closely allied to var. 8 of the last described species, but apparently distinct, 

 for similar reasons with those stated in the observations appended to Po. Cha- 

 riclea: the anterior wings above are very acute at the apex, they arc white 

 in both sexes, with the base black and the tip slightly clouded with dusky : 

 the male has a single obsolete dusky spot, and the female two— tlie one at 

 the anal angle being geminated ; this sex has also the basal half of the wing 

 much clouded with tlusky : the posterior wings in both sexes are white, with 

 the base black, and a dusky costal spot. Beneath, the sexes are similar; the 



