14 MEMOIRS NATIONAL ACADEMY OF SCIENCES. vol. xii, 



singular twin discal spots. It is possible that Copiopteryx with its very long tails is an extremely 

 specialized Dysdsemonia. It has no near relationship to Eudsernonia. 



Geographical distribution. — A member of the Neogaeie fauna, extending from Vera Cruz, 

 Mexico, to Brazil. 



DYSD-ffiMONIA BOREAS [Cramer] Hubner. 



Phalxna-Altacus boreas Cramer, Papillons Exotiques, I, p. 110, PI. LXX, B. 1774. 

 Dysdxmonia boreas Hubner, Verzeichniss bek. Schmett., p. 151, 1822 (?). 

 Dysdxmonia boreas Druce. 

 Dysdxmonia boreas Kirby, Syn. Cat. Lep. Het., I, p. 768, 1892. 



LARVA. 



Peters, H. T., Bie Heteroceren Raupen, p. 9, PI. Ill, fig. 9, pupa, 9a (reduced), (a very brief description of colors 

 only). 



Imago. — 1 <? , 1 9 . General color of thorax, abdomen and wings fawn or elk brown, or 

 color of a dead brown leaf, being of a pale umber, with a hoary or frosted tint. Head, palpi, 

 fore legs and breast chocolate. Antennae pale, the joints dark. 



Fore wings with three narrow brown lines diverging from near the inner angle, the basal 

 one arising somewhat beyond the middle of the inner edge, and passing in a slightly curved 

 direction to the inner fourth of the costal edge; the extradiscal and submarginal lines arise 

 close together near the inner edge and diverge a little, the inner passing close to the discal spots 

 and the submarginal, parallel with the outer edge and near the costa, bent at a right angle 

 onto the costa, approaching the costal end of the extradiscal line. The edges of the wings are 

 only slightly darker brown than the middle of the wing. There are faint traces of a very 

 diffuse dark shade between the basal line and the discal spots. Two conspicuous rather large 

 clear discal spots at the end of the discal area, and separated by a vein; they are regularly oval, 

 the larger end looking toward the base of the wing and bordered with chocolate brown, more 

 narrowly so on the outer end. Outer edge of the wing with the apex broad and square, and 

 the deeply excavated outer edge below the broad square elongated apex is divided into four 

 scallops. 



Hind wings with three lines as in the fore wings, but the third or outer one is curved around, 

 ending at the base of the tail. A small round inconspicuous discal clear spot. Underside of 

 the wings slightly paler than above, the submarginal line is not repeated, but the two inner 

 ones are distinct, and the twin discal spots are not bordered with chocolate in either sex. 



Expanse of the fore wings, <? , 117 mm. ; ? 130 mm. 



Length of one wing, <? , 63 mm. ; 9 70 mm. 



Breadth of one wing, o* , 33 mm. ; 9 38 mm. 



Length of hind wing, including tail, 8 61 mm; the tail alone, 18 mm.; width of tail 

 at end, 7 mm. 



Length of hind wing, including tail, 9 56 mm.; the tail alone, 10 mm.; width of tail 

 at end, 8 mm. 



Length of an ocellus, 6 mm. 

 A very interesting and peculiar form, the leaf-brown color, the tattered and torn ragged 

 outer edge of the wings, and the tailed hind wings, evidently make it a mimetic form, reminding 

 one of the KaUima butterfly. 



Larva. — Peters states that "the third segment of the body is swollen or humpbacked; 

 that the body is green, often ornamented with violet." 



Judging from his figure the body is smooth, unarmed with either spines or tubercles; his 

 drawing showing no traces of any kind of armature. The body tapers to the anal legs, which 

 seem to be much smaller than usual; the suranal plate not being prominent. On the other 

 hand the third thoracic segment is very large, much swollen and bulging out in front on each 

 side. The first and second thoracic segments, as well as the head, are small; the second seg- 

 ment about half as wide as the third, and these two segments, with the head, are probably, 

 when the creature is alarmed, retracted within the third segment. 



