115G THE BUTTERFLIES OF NEW ENGLAND. 



Table of genera ofPieridi, based on the egg. 



Upper part of egg beginning to taper at or below the middle Pontia. 



Upper part of egg beginuiug to taper well above the middle Pieris. 



No material at hand for a taljle based on the caterpillar at birth. 



'I'able of genera, based on the mature caterpillar. 



Body more or less conspicuously striped with darker and lighter colors ; larger hair-supporting 



papillae broader, often much broader than high Pontia. 



Body almost uniformly green; larger hair-supporting papillae higher than broad Pieris. 



Table of genera, based on the chrysalis. 



Frontal tubercle stout, no longer than broad Pontia. 



Frontal tubercle slender, very much longer than broad Pieris, 



Table of genera, based on the imago. 



Middle of outer half of hind wings with a serrated black band ; second superior subcostal 

 nervule of fore wings arising at or beyond the tip of the cell ; fore tibiae very much shorter 

 than middle tibiae Pontia. 



Middle of outer half of hind wings with no transverse band ; second superior subcostal ncr- 

 vure of fore wings arising distinctly before the tip of the cell; fore and middle tibiae of equal 

 length Pieris. 



PONTIA FABRICIUS. 



Pontia Pal ir.. 111. mag., vi : 283 (1807). (Not Mancipium Hiibn., nor Synchloe Hiibn., 



Pieris (pars) Auctorum. restr.) 



Synchloe (pars) Auctorum. Type. — Pap. daplidice Linn. 

 Mancipium (pars) Auctorum. 



And the white butterflies. 

 From shade to sun-streak are they glancing still 

 Among the poplar-boughs? 



Hemans. — Flowers and Music. 



Imago (56 : 5). Head moderately large, clothed with long, erect hairs, longest on 

 the front, where they are ascending. Front tumid, especially in the middle, where it 

 surpasses the front of the eyes ; above descending greatly but roundly into the anten- 

 nal pits and to the middle of the space between the antennae; beyond this it is again 

 slightly, transversely tumid, forming a rounded ridge in opposition to that of the ver- 

 tex, and from which it is separated by a rather deep, transverse sulcation ; the portion 

 below the antennae is considerably broader than high, and fully as broad as the eyes 

 on a front view, the sides diverging upw.ard a little ; lower border squarely docked. 

 Vertex longitudinally, ^equally and regularly arched, passing the level of the eyes 

 throughout, the outer anterior angles produced and considerably elevated as tubercles ; 

 anterior border slightly concave, a little elevated, its margin abrupt. Eyes neither 

 large nor full, naked. Antennae inserted with the posterior margin in advance of the 

 middle of the summit, in distinct, deep pits, separated by a space nearly equal to the 

 width of the second antennal joint; a little longer than the abdomen, composed of 

 about thirty-three or thirty-four joints, of which the last eight form a strongly com- 

 pressed, spatulate club, about Ave times as broad as the stalk, two and a half times 

 longer than broad, increasing rapidly and regularly in size on the first four joints, the 

 last two forming a broadly rounded apex, scarcely angulated at the tip. Palpi very 

 slender, less than twice as long as the eye, apical and basal joints each three-ilfths the 



