PAPILIONIDil2. — PONTIA, 21 



geners. The chrysalis is greenish-yellow, spotted on the head and back ; 

 with the anterior edge of the wing-cases strongly spined. 



This pretty insect is not uncommon in all parts in the vicinity of 

 the metropolis ; but it affects woods and meadows in preference to 

 gardens. Very great dissimilarity prevails amongst the varieties 

 described above, which renders it difficult to place some of them to 

 their proper locations; in fact, amongst them are several which 

 closely approximate to Po. Napsefe and Sabellicce ; but the wings are 

 of dissimilar form. 



Sp. 6. Napseae. Alls lacteis, superioribus supra puncto opiccquc 



nigro-maculatis^ inferiorihus pallidis, venis tribus primoribics 



dilatato-viresccntibus. — (Exp. alar. 1 unc. 10 lin. — 2 unc. 2 lin.) 



Pa. Napsese. Esper. — Po. Napsete. Steph. Catal. 



Like its congeners this species varies considerably: the male has the upper 



surface of the wings milk-white, with the tip, a spot, and two or three 



triangular dashes on the hinder margin of the anterior black : beneath, the 



latter have slightly dilated greenish nervures, with two cinereous spots placed 



transversely, and a yellowish tip: the posterior wings are pale yellowish, 



with a deeper costal streak : the basal nervures above dilated and greenish. 



The female has tlie tip of the anterior wings, and three spots, one of which is 



subtriangular, and placed on the thinner edge of the wings, black or dusky, 



and the posterior wings are clearer yellow. The nervures on the under 



surface of the posterior wings are more or less dilated in different specimens, 



Var. /3. Female without the transverse cinereous spots beneath. 



The larva and pupa are unknown to me ; the perfect insect 

 occurs in the metropolitan district, and probably in other parts of 

 the country. I think, with Godart, that it may only be a very 

 large variety of Po. Napi, but as it appears to have characters 

 sufficient to constitute a distinct species, the determination of this 

 point must be left for a future investigation. 



Sp. 7. Sabellicae. Plate III. * f. 3, ^ .— f. 4. ? .—Alls supra alb'ulh 

 basi nigricanie, utrinqu^fuscescente-venosis; subtus antkis apice^ 

 post'icis pagind omnijlavescentibus. (Exp. alar. 1 unc. T — 10 lin.) 



Pa. Sabellicffi. Petiver, pi. I. f. H, 18, $ .—/. 15, 16, ? .— Po. 

 Sabellicae. Steph. Catal. 



Allied to Po. Napi, but dissimilar in form, the wings being shorter and more 

 rounded; the anterior being nearly of the form ofthoseof Po. Cardamines,— it 

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

 fourtli and sixth marginal cells, and the inner edge of the wings of the same 



