— yo- 



Wings bleached and mounted in this way make an im- 

 portant addition to a collection. The slides should be care- 

 fully labelled ; and the insect from which the wings were 

 take should be kept with the slide. It is our practice to re- 

 move always the wings from the right side, and then to 

 mount the slide in the collection at the right of the insect 

 from which the wings were taken. Uniformity in this 

 respect adds greatly to the appearance of the collection. 



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 

 the specimens, as moths of this genus are rare in this country. 



In the description of these wings, note especially a strik- 

 ing difference between them and the wings of Diptera as re- 

 gards the nature of vein II. 



The membraneous lobe near the base of the inner margin 

 of the fore wing is the jugum . 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 

 arrangement assures the acting together of the two. wings. 



Wings of a Cossid— Mounted wings of one of the Cos- 

 sidce will be furnished the student for study. 



In the description, state the most important differences be- 

 tween these wings and those of Hepialus, and make a com- 

 parison between the structure of vein VIII in the Lepidoptera 

 and in the Diptera. 



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. In the description of this wing 

 explain the significance of the three short spurs that project 

 into the distal end of the large cell near the middle of the 

 wing. 



In the description of the hind wing, discuss the changes 

 that have taken place in media. 



