1194 THE BUTTERFLIES OF NEW ENGLAND. 



gin of the himl wings ; the nervures are as broadly, but by no means so deeply bordered 

 witli dark scales; it is a little smaller and lias been described as a distinct species by 

 Mr. Kdwards under the name of virn;iniensis. 



No yellow variety of this species has yet been tietectcd, though they have been found 

 in P. rapae (see infra) and in the European P. napi (see Schoyen, Ent. tidskr. , vi : 140). 

 Accessory sexual peculiarities. The androconia (46 : 39) are shorter and far 

 stonier than in P. rapae ; especially the contracted distal half is far stouter, being 

 nearly half as broad as the broadest part of the lamina, usually broader than the basal 

 lobes, with abroad, expanding, fringed border, the filaments of the fringe not crowded, 

 distinctly enlarged apically ; the basal lobes approach each other so as nearly to touch, 

 enclosing the pedicel in a rounded opening. 



Egg (65 : 27). Florence flask shaped; largest just above the base, tapering gently .al- 

 most to the summit, near which it tapers less and then terminates in a flattened top; there 

 are thirteen longitudinal ribs .1 mm. apart at the widest, approaching each other above; 

 transverse lines .02 mm. apart; surface nearly flat, shining, nearly smooth, very deli- 

 cately shagreened. Micropyle rosette (68 : 15) much like that of P. rapae, the only 

 diflerence noted being in the width of the oval cells, which are at least .0127 mm. 

 broad. Color pale greenish yellow. Height. 1.18 mm. ; greatest breadth, .45 mm.; 

 breadth at base, .355 mm., at summit, .23 mm. 



Caterpillar. First stage. Head (79: 50) very pale greenish, almost pellucid, with a 

 very few pellucid curving hairs about as long as the body hairs but pointed at tip; 

 ocelli blackisli fuscous; all the mouth parts pale. Body pellucid white with a yellow- 

 ish tinge posteriorly; after eating, green. Hairs pellucid, erect, those of the first 

 thoracic segment longer than the others and curved slightly forward ; legs and prolegs 

 pale. Length at birth, 1.3 mm. ; afterwards, 2 mm. ; breadth of head, .42 ram. ; of 

 body, .28 mm. ; length of hairs, .12 mm. ; breadth of same at tip, .01 mm. 



Diflers from the same stage of P. rapae in being slenderer, with shorter hairs whose 

 apical enlargements are slenderer. 



Second stage. Head uniformly pale yellowish green studded with scant, mingled 

 white and black papillae, bearing dark bristles ; ocelli black, and mouth parts only 

 slightly infuscated apically. Body rather dark bluish green as far as the iufrastig- 

 matal fold, decidedly paler beneath, and mottled very faintly throughout with pale 

 green annuli encircling the darker green or white papillae. Serial papillae white, bear- 

 ing black bristles, infundibuliform at tip and ordinarily accompanied by a globule of 

 fluid. Other hairs in the upper half of the body shorter and black or dark brown, 

 those nearer the stigmatal fold pale. Prolegs and stouter portion of the legs of the 

 color of the under surface; apical portion of the legs pellucid. Length, 6.5 mm.; 

 breadth of head, .G mm. 



Third stage. Head (79: 51) green with sparsely scattered, mingled black and white 

 hairs arising respectively from black and white papillae, some white ones much longer 

 than the rest. Mouth parts pellucid green. Body green with a yellowish tinge, stained 

 •with obscure roundish blotches of darker green somewhat regularly disposed dorsally. 

 There is a distinct yellow dorsal line and a less distinct dull yellow stigmatal line, set off 

 by a dark green bordering above. Whole body sprinkled profusely above with minute and 

 slightly larger black papillae giving rise to delicate black and brownish hairs, mostly 

 arranged more or less vaguely in transverse rows ; and besides, with definite series of 

 larger white papillae giving rise to bubble-tipped, longer, stift", black, pointed hairs, 

 viz. , an anterior laterodorsal (slightly nearer on first and second thoracic segments) , a 

 subposterior lateral, and an anterocentral sublateral (or laterostigmatal), all being 

 central on the second and third thoracic segments. Below the stigmatal line the body 

 is paler and the papillae are larger, white, very irregularly disposed and give rise to 

 pellucid or whitish longer hairs. Spiracles with a fine, blackish brown annulus. 

 Length, 10 mm. 



Fourth stage. Agrees in all external appearances with the final stage. Length, 15 

 mm. ; breadth of head, 1.3 mm. ; of body, 2 mm. 



Last stage (76 : 8,9). Head (79 : 52) deep pea-green, covered with brownish hairs 



