EXPLANATION OF PLATE 16. 



Butterflies in black. — Nymphalidae, Fapilionidae. 



Priuted at the Uuiversity Press. The woodcuts from diftereut sources. Figs, l-o, 7, 9, 10 were purchased of 

 C. V. lliley; fig. 6 was engraved by Heury Marsh after a drawing by J. Henry Blalie; and fig. S was lent by Dr. 

 A. S. Packard, All are of natui-al size. 



1. Pontia 2)roto(lice $. Upper surface. 



2. Fontia protodice $. Upper surface. 



3. Laertias philenor. Upper surface. 

 i. Pieris rapae ^ . Upper surface. 



5. Pieris rapae $ . Upper surface. 



6. Prodri/as perseplwnc, a fossil butterfly from 

 the tertiaries of Colorado, of the family Nympha- 

 lidae. 



7. Chlorippe dytOH $ . Upper surface ; the dot- 

 ted Hue indicates the contour of the left wings of 

 the female. 



8. Polygonia progne. Both surfaces, the under 

 on the right. 



9. Chlorippe dyton $ . Under surface. 

 10. Anosia plexippus $. Upper surf ace. 



