EXPLANATION OF PLATES. 



PLATE I. 



{Engraved from nature by Anna Botsford Comstock.) 



Fig. I. — Smerinthus geniinatus. 

 Fig. 2. — Hepialis argenteoniaculatus. 

 Fig. 3. — Attacus promethea. 



In Figure 2 is represented oue 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. — Eudatnus tityrus. 

 Fig. 2. — Papilio polyxenes. 

 Fig. 3 . — Pieris protodice. 



PLATE III. 



{Drawn by E. P. Felt.) 



Fig. I. — Halisidota tessellata. 

 Fig. 2. — Thyris maculata. 

 Fig. 3. — Platephemera antiqua. 

 Fig. 4. — Thyatira scripta. 

 Fig. 5. — Hexagenia bilineata. 

 Fig. 6. — Phryganidia calif ornica. 



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



