101 



Wings of Hepialus Mounted specimens of the two 



wings of one side of a moth belonging to the genus Hepialus 

 will be furnished the student for study. Be very careful of 

 th^ specimens, as moths of this genus are rare in this 

 country. 



The membranous lobe near the base of the inner margin 

 of the fore wing is \hejugum. This extends under the costal 

 margin of the hind wing, while the greater part of the inner 

 margin of the fore wing overlaps the hind wing. This ar- 

 rangement assures the acting together of the two wings. 



Wings of a Cossid. Mounted wings of one of the 

 Cossidce will be furnished the student for study. 



Wings of the monarch butterfly. The student will 

 be furnished with specimens of the two wings of one side of 

 the monarch butterfly, Anosia plexippus. 



Study the fore wing first. Explain the significance of the 

 three short spurs that project into the distal end of the large 

 cell near the middle of the wing. 



Wings of frenate moths. Specimens of moths be- 

 longing to the family Noctitidce. will be used as illustrations of 

 Lepidoptera in which the frenulum is well developed. Two 

 specimens, a male and a female of the same species, should be 

 studied if practicable. 



Remove the wings of the right side of the female, and 

 bleach and mount them. 



Figure these wings. 



Remove the wings of the right side of the male, and bleach 

 and mount them. 



Figure these wings. 



Describe the secondary sexual distinction exhibited by the 

 wings of this species. 



How could one of these types have been derived from the 

 other ? 



Study the wings of the male that have not been bleached, 



