Packard.] 
114 
[May 7, 
adopting provisionally the belief that the butterflies have originated 
from moths resembling the Bomby^ces more than any other group, 
at least from hairy or spiny caterpillars, and while the Nymphalidse 
may have originated from Arctian-like forms, the Papilionidce , at 
least the genus or group Papilio, arose from Attacid-like forms. 
They certainly show no signs of descent from the Sphingidse, the 
Castniidse, the Agaristidse, Cossidse or Hepialidse. 
To recapitulate : It would appear that the Hesperidse are the more 
generalized butterflies, but their origin does not seem apparent. 
The Papilionidse perhaps stand next above them, as they have ap- 
parently descended from an earlier, lower type than the Nymphali- 
dse, which may have originated from Arctian-like Lepidoptera. 
The Lycsenidse certainly appear to be the most extremely modified, 
and form a lateral shoot, perhaps parallel to the Nymphalidse ; they 
at least appear to be a more modern, highly modified family, though 
somewhat degenerate as regards their larval form, and thus recall 
the Cochliopodidse, which are highly modified Bombyces, and form 
a side branch of the Bombycine phylum, rather difficult to classify. 
EXPLANATION OE PLATE I. 
Fig. 1. Abdominal leg of Parorgyia parallela, in stage i. 1,2, 3, the 
divisions or incipient segments; g, grypogene; and the two sets of 
primitive crochets. 
Fig. 2. Orgyia leucostigma, the four middle abdominal legs of one side. 
Fig. 3. Orgyia leucostigma , one of the middle abdominal legs magnified 
to show the grypogene ( g ) ; p, planta; m, retractor muscle of one 
pair of crochets. 
Fig. 4. The same showing different stages (c, b, c) in the development 
of the secondary crochets (c, r ). 
Fig. 5. Planta of Parorgyia parallela after the first molt; a, glandular 
hairs of the edge of the planta. 
Fig. 6. Abdominal leg of freshly hatched larva of Clisiocampa americana. 
Fig. 7. Abdominal leg of freshly hatched larva of Artace punctistriga. 
EXPLANATION OF PLATE II. 
Fig. 8. Artace punctistriga , same leg as Fig. 7, showing the planta (p) 
much enlarged, with the grypogene ( g ). 
Fig. 9. Anal legs of Dasylophia anguina ; m, retractor muscle of the planta. 
Fig. 10. Lochmceus manteo, end of a thoracic leg ; c, claw or unguis ; t, 
tenant hair; l, leaf-like modified tenant hair. 
Fig. 11. a , b, c, glandular hairs of Dasylophia anguina. 
Fig. 12. Glandular hairs of Lochmceus manteo. 
Fig. 13. Glandular hairs of Ceratosia tricolor. 
Fig. 14. Glandular hairs of Scliizura ipomece. 
