580 THE BUTTERFLIES OF NEW ENGLAND. 



its anterior border arched. Upper organ of male abdominal appendages moderately 

 stout ; the centrum not so globose as in the other Argynnidi, the hook slender and small, 

 scarcely as long as the centrum, delicately bifid at the tip. Clasps broad, tapering on 

 the apical half, of varying length, the tip produced to a slender blade, Avhich is 

 twisted so as to appear depressed and incurved ; upper process very slender, enlarged 

 a little or spatulate at the tip, and subparallel to the posterior blade of the clasp. 



Egg. Somewhat conical sugar-loaf shaped, much taller than broad, but the npper 

 portion a little constricted, the lower two-thirds only of the sides being gently 

 swollen, thickest in the middle of the lower third; the summit squarely truncate, its 

 centre depressed, the base flat ; furnished with a considerable number of prominent, 

 equidistant, longitudinal ribs, running from the base to the summit and a little over 

 it, or combining with a neighbor to form a single rib in the narrowest part of the 

 egg ; surface between the ribs traversed by delicate transverse raised ridges not so 

 distant as the ribs and quite conspicuous. Micropyle rosette, situated on a sunken 

 floor, made up of delicate little roundish cells, increasing in size very little from 

 the centre outward. 



Caterpillar at birth. Head broad, much broader than high, Avell rounded below, 

 the sides nearly equal and slightly compressed, broadest above, tlie summit very 

 broadly rounded, furnished with a few long curving hairs. Body tapering a very lit- 

 tle posteriorly, cylindrical, furnished on each segment equally with pretty large, con- 

 ical warts, sometimes arranged in clusters, bearing very long, tapering, delicately 

 spiculiferous hairs, very minutely expanding at the tip into a short cup-sliaped club, 

 not so broad as the base of the hair, and longitudinally distributed as follows on 

 either side : a subdorsal row* one to a segment placed anteriorly, a supralateral 

 row one to a segment placed posteriorly, an infralateral row one to a segment 

 placed in the centre, and a substigmatal row with a cluster of Ave or six bristles 

 placed nearly in the middle. Legs quite long and slender, the claw very little curved, 

 tapering, with a very slight heel at the interior base. Prolegs long and tapering reg- 

 ularly, closely approximate and bearing not very long, semicircular, slender booklets, 

 arranged in the greater part of a circle, six in number on each leg, possibly seven on 

 the hinder. 



Mature caterpillar. Head well rounded, rather squarely cut beneath, the mandi- 

 bles very protuberant; rather broadly and irregularly arched above, scarcely depressed 

 at the suture, the middle of the sides nearly straight, broadest at the upper part of 

 the ocellar fleld, equally broad and high, scarcely deeper below than above; triangle 

 half as high again as broad, reaching above the middle of the front. Head covered 

 with frequent, pretty long, nearly straight, bristly, tapering hairs. Second antennal 

 joint half as long as broad, tliird scarcely more than half as broad as the second, 

 and less than twice as long as broad, abruptly docked and furnished witli a long apical 

 bristle. Ocelli six in number, five of them forming a strong curve whose convexity is 

 forward and a little upward, at nearly equal distances apart, the second and third 

 counting from above, nearest together, the others distant from each other by less than 

 half their diameter ; the sixth is situated directly beliind tlie fourth and as far from it 

 as the second is from the fifth; the third, fourth and fifth are large and prominent, the 

 others inconspicuous ; labrum rather large, prominent, the middle of the front 

 roundly and rather deeply excised. Mandibles large, broad, not very stout, their edge 

 straiglat, with broad, squarish, scarcely separated teeth. Maxillary palpi with the sec- 

 ond joint fully half as long as broad, the third scarcely more than half as broad as the 

 second, but half as long again as broad, the fourth as long as broad and half as broad 

 as the third. Spinneret short, stout, tapering. 



Body nearly cylindrical, slightly depressed, equal, furnished with longitudinal rows 

 of tubercles, one to a segment in each row; excepting sometimes an anterior pair, 

 the tubercles are fleshy, stout, rather short, conical elevations, bluntly rounded at the 

 tip and furnished with a large number of not very long needle like thorns, diverging 



*Gruber says there is a mediodorsal row in B. myrina, l)Ut he is miistakeu. 



