EXPLANATION OF PLATES. 



PLATE I. 



{Engraved from nature by Anna Botsfwd Comstock.) 



Fig. I. — Smerinthtis geminatus. 

 Fig. 2. — Hepialis argenteomaculatus. 

 Fig. 3. — Attactis promethea. 



In Figure 2 is represented one of the most generalized of living Lep- 

 idoptera ; in Figure i is shown a form in which the wings are narrow, 

 being fitted for rapid flight ; and in Figure 3, one in which the wings 

 are broad, being fitted for a different mode of flight. 



PLATE II. 



{Drawn by E. P. Felt.*) 



Fig. I. — Etidatnus tityrus. 

 Fig. 2. — Papilio polyxenes. 

 Fig. 3. — Pieris protodice . 



PLATE III. 

 {Drawn by E. P. Felt.) 



Fig 

 Fig 

 Fig, 

 Fig 

 Fig, 

 Fig 



— Halisidota tessellata. 



— Thyris maculata. 



— Platephemera antiqua. 



— Thyatira scripta. 



— Hexagenia bilineata. 

 — Phryganidia californica. 



*The figures in the text in the preceding pages were also drawn by Mr. Felt. 



