HESrERIDI: THE GENUS THANAOS. 1449 



side view, with a posterior narrow collar which is more or less excised, sometimes 

 almost completely severed in the middle above, covered with a delicate and very 

 sparse pile of fine, short, simple, tapering liairs. Ocelli six in number, four subequi- 

 distant, in a curve forming' the arc of a circle of which the sixth ocellus is the centre, 

 the llfth being situated directly beneath the sixth, and lying with the fourth and sixth 

 at the angles of an equilateral triangle; it is placed near tlie posterior onter corner of 

 tlie antennal socket; the ocelli are subequal in size but the tliird counting from 

 above is the largest. Third antennal joiut very small, cylindrical, three times as long 

 as broad, the bristle more than twice its length. 



Body largest at the third, fourth and llfth abdominal segments, tapering with con- 

 siderable uniformity in either direction, but more rapidly at each extremity, the first 

 thoracic segment being considerably but not con.spicuously narrower than the head, 

 ■with an entirely obscure dorsal shield, and legs scarcely. If at all, smaller than the 

 other pairs. Last abdominal segment well and rather strongly rounded apically, 

 fringed rather closely with moderately long hairs. Segments of the abdomen divided 

 into four subsegments, the anterior the widest, and as wide as the rest together, the 

 three posterior subequal and occupying only the hinder half of the segment, the broad 

 anterior one with a dorsal division separating off a posterior portion of the same 

 width as the hinder sections, all covered profusely with minute, low papillae bearin" 

 very short hairs, tapering to a point (the apically expanded bristles being lost after 

 the assumption of the fourth stage) and arranged in transverse series on the shorter 

 sections only, because, from their avoidance of the incisures, there is hardly room for 

 more than one or two rows of them. Body furnished also with a laterodorsal series 

 of chitinous aunuli, placed in the middle of the anterior half of each segment of the 

 body, a laterostigmatal series of similar annuli directly above the stigmata, and a veu- 

 trostigraatal series, two to a segment, near together in advance of and behind the 

 middle. Inferior gland of the first abdominal segment small but distinct and trans- 

 versely sulcate. Stigmata long oval, slightly elevated, delicate. Legs slender, gently 

 tapering, the claws fine, strongly curved, heavily heeled. Prolegs short, rapidly 

 tapering, apically broadly ovate with a complete double row of outward curving hook- 

 lets which are very small, not very delicate, nor very sharply pointed, but taper 

 throughout. 



Chrysalis. Head somewhat distinct from the thorax, the ocellar field being sub- 

 globose, prominent, and the anterior extremity between the eyes independently and 

 considerably tumid, accentuating their prominence, the whole broad, scarcely de- 

 pressed. Thorax moderate, tumid and regular above, basal wing tubercles slight, but 

 enough to make the thorax just wider than the eyes, faintly and obliquely carinate In 

 nearly the direction of the antennae. The upper surface of the head and thorax to the 

 summit of either forms a straight, unbroken line, when viewed laterally, with aconsid- 

 erable slope at an angle of about 45° with that of the lower surface as far as the 

 swollen, apical half of the wing cases where the body is largest. On the abdomen on 

 the contrary the upper surface is straight, or scarcely concave from the height of the 

 thorax to the last segment, while the under surface continues the posterior curve of 

 the wing covers, curving rather strongly upward apically, so that the whole lateral 

 aspect of the chrysalis is that of a broad, sigmoid curve. Viewed dorsally, the body 

 is nearly equal from the basal wing tubercles to the middle of the abdomen, with a 

 scarcely perceptible constriction at the middle of the wings, and a distinct, though 

 slight and broad enlargement on their apical half; the apical half of the abdomen 

 tapers rapidly. The thoracic spiracle-guards are moderately large, semi-lenticular. 

 There is no mandibular tubercle. The second pair of legs extends a little beyond the 

 base of the antennal club, the third pair somewhat beyond the antennal tips, which 

 are finely pointed ; and the tongue a little beyond the wings and almost to the tip of 

 the fourth abdominal segment. Spiracles oval, nearly tivice as broad as long, not 

 prominent. Cremastral spine pyramidal, truncate, rudely quadrilateral, longitudinally 

 and irregularly sulcated, the booklets half as long, forming a flaring bunch. 



iSa 



