1414 THE BUTTERFLIES OF NEW ENGLAND. 



Caterpillar at birth. Head much as in Epargyreiis, very delicately punctate and 

 striato-punctate. Body uniform, much narrower than the head; prothoracic shield 

 large, covering almost the entire segment, and including the spiracles; segments 

 divided into a broad anterior and four subequal, narrow, posterior sections, each 

 of which bears transversely a row, the anterior three rows, of scarcely raised, sub- 

 conical, dot-like papillae; several longitudinal rows of bristles, of unusual length 

 and slenderness, very delicately forked at tip, mounted on minute papillae arranged 

 thus : on the middle of the anterior large section a laterodorsal series, slightly more 

 approximated on the thoracic tliau ou the abdominal segments ; a central or posterocen- 

 tral inf ralateral series on the anterior of the four short sections, at a similar lieight on 

 all the segments, or scarcely higher ou the thoracic; au anterior suprastigmatal series 

 on tlie middle of the anterior broad section, one to a segment, higher than this, 

 double and two to a segment on the thoracic segments ; au inf rastigmatal series 

 having one on the thoracic and a pair on the abdominal segments. The posterior seg- 

 ment has some incurved hairs slightly longer than the others, but none that are 

 recurved. Besides the l)ristle-bearing papillae there is a row of infrastigmatal aunuli 

 just above the anterior infrastigmatal bristles. 



Mature caterpillar. Head orbicular, scal)rous, pilose, tlie occipital suture nar- 

 rowly impressed, the summits of the hemisi)heres crowned witli a few denticles poste- 

 riorly; triangle very slender, much higher than broad; labrum broadly and roundly 

 emarginate; mandibles massive. Ocelli sul)equal, the four anterior in a slightly 

 arcuate row, equidistant, the posterior forming almost exactly the centre of the circle, 

 of wliich the others form an arc. Third joint of antennae slender, straight, cylin- 

 drical, slightly enlarged apically, three times as long as broad, the fourth a miniature of 

 the third, about lialf as long as the breadtli of tlie third, the bristle very long, 

 tapering, four or more times longer tlian third joint. 



Body plump, cylindrical, tapering forward on the thoracic, and bacliward and espe- 

 cially depressed on last abdominal segments, the latter divided into au anterior, broad, 

 a second half as broad and tliree more still smaller and equal subsegments by transverse 

 impressed lines, the first and second merging, and the third terminating, just above the 

 spiracles; the second and third thoracic segments similarly divided iuto three sub- 

 equal subsegments ; first thoracic segment with a slender posterior chitiuous shield, 

 which fades out at, but embraces the spiracles. Body covered profusely with minute 

 papillae, bearing very short, sliglitly clubbed, delicate hairs. Spiracles regularly obo- 

 vate. Legs with first joint equal, compressed, second and third joints rapidly taper- 

 ing, all armed beneath, apically, with spinous hairs. Prolegs very stout. 



Chrysalis. In general form most resembling Epargyreus, but much slenderer ; head 

 and prothorax, as viewed from abo\'e, forming a quadrangular mass, with gently 

 rounded sides, rather strongly rounded front, the middle third of which has a rounded 

 prominence of its own, the whole about twice as broad as long, and slightly narrower 

 than the thorax, which slopes towards it in front of the basal wing tubercle; this 

 forms scarcely more than an angulation of the body ; the thorax has much the same 

 form as in Epargyreus, being slightly piuched laterally above ou its hinder half; meso- 

 thorax slightly longer 'than broad ; the body of about uniform width as far as the 

 third abdominal segment, beyond which it tapers at first gradually, afterwards very 

 rapidly to a conical tip ; viewed laterally the mesothoras is pretty regularly arched, 

 with a more rapid descent in front than behind; the jirothorax a little sunken, the 

 anterior extremity of the body with a blunt, parabolic curve; the abdomen is at first 

 equal, afterwards conical. Mandibular plate smooth; prothoracic spiracles large, 

 broadly semi-lunate, with protuberant, flaring, posterior lip, which is fluted excepting 

 at the edge itself ; the whole faces forward and is filled, excepting a tolerably large 

 and circular hole, with a mass of short filaments ; posterior legs and antennae reaching 

 the same point at about the end of the second abdominal segment : movable segments 

 of the al»domen with an encircling carina, as in Epargyreus ; preanal button much as 

 in Thorybes; cremaster as long as the eighth and ninth segments together, triangular, 

 a little produced, and subequal apically, with a well rounded apex, as viewed from 



