20 IIAUSTELLATA. — LEPIDOPTERA. 



anterior wings are white, with the tip yellow, the base and two obsolete spots 

 dusky : the posterior wings are bright yellow, with a pale orange streak on 

 the costa, strongly irrorated throughout with dusky, the anterior half of the 

 discoidal cell being least speckled. The antenna?, legs, and body resemble 

 those of Po. Rapa; : the cilia are entirely clear white. 

 Var. /3. Male with the wings above cream colour, the base of all deep black ; 

 the discoidal spot on the anterior, and the costal spot of the posterior nearly 

 obsolete : beneath, the anterior wings have but a single obsolete discoidal spot, 

 and the posterior have the hinder half of the discoidal cell so thickly irrorated 

 with dusky as to appear streaked. 

 Var, y, Male with all the wings above immaculate white, with the base black, 

 and the apex of the anterior very obscurely clouded : beneath similar to 

 var. ^. 



I am unacquainted with the larva of this species ; but the chrysalis 

 does not materially differ from that of Po. Rapa?. The insect occurs 

 early in April, and a second time towards the end of June. I 

 obtained specimens of the first brood at Hertford ; and of the second 

 I captured some this season, at Ripley, at the latter period. 



Sp. 5. Napi. Alls svp?-a albis, suhtus venis dilatatis Jiisco-vires- 

 centibus, anticis apice, posticis pagind omni, Jlavescentihus. — 

 (Exp. alar. 1 unc. 4 lin. — 2 unc.) 



Pa. Napi. Linnc. — Don. viii. pi. 280. y^ 1. — Po. Napi. Steph. 

 Catal. 



Wings above white, with the tip of the anterior dusky : the male with a black 

 spot between the middle and hinder margin of the anterior wings, the under 

 surface of these wings has the nervures dusky, with the tips pale yellow, and 

 two dusky spots towards the hinder margin : the posterior wings beneath are 

 pale sulphur yellow, with the nervures much tlilated and dusky-greenish ; 

 the nervure on the costal edge of the discoidal ceU with a clear yellow dash. 

 The female has the anterior wings more rounded than the male, with two 

 large black spots placed transversely, and an obscure claviform dash towards 

 the thinner edge : both sexes have a black costal spot on the posterior wings 

 above : the body black, with its under part white : the antennse white, annu- 

 lated with black. 



Var. B. With the base of all the wings in both sexes deep black. 



Var. y. Male with the anterior wings immaculate above, with one indistinct 

 spot beneath : the base of all the wings above clear black. 



Var. I. Both sexes with the nervures of the posterior wings dilated at the base 

 beneath. 



Var. E. Female with the wings yellowish above. 



Var. f. Dilated nervures of the posterior wings beneath dusky in both sexes. 



The caterpillar is green-brown, clearer on the sides, with the stigmata yellowish ; 

 it is covered with white tubercles, with black tips, bearing very delicate hairs; 

 it feeds on the Brassica Napus (or Navew) and similar plants, Uke its con- 



