384 THE WINGS OF INSECTS 



MATERIALS NEEDED FOR THIS COURSE 



A wall chart showing the hypothetical tracheation of a wing of the 

 primitive nymph. This is a copy of Figure 411 of the following outline 

 and is used in an introductory lecture in which the fundamental principles, 

 briefly indicated in the introduction to the outline, are more fully explained. 



Mounted wings to be studied by the students specializing in entomology. 

 It is well to have several sets of these, so that more than one student can be 

 studying the same kind of wing at the same time. If the mounts are 

 carefully used, they will serve for many successive classes. 



Mounted wings for use in practicums. A limited number of kinds will 

 be required; but there should be as many mounts of each kind as there are 

 students in a section of the class, as all will need the same kind of wing at 

 the beginning of the practicimi. 



Sets of printed figures of wings for use in practicums, where the students 

 do not have the time necessary for making original drawings of all of the 

 kinds of wings studied, and for use in other cases when desired. These sets 

 can be obtained of The Comstock Publishing Company, Ithaca, N. Y. 

 Each figure is printed on a separate sheet. Figure 408 is a copy of one of 

 these figures. 



A printed outline, one for each student, of the laboratory work in this 

 subject. This outline consists of a reprint of the following pages of this 

 chapter. The preceding pages, being merely suggestions for the use of 

 teachers, are not included in the outline of laboratory work. Copies of this 

 otttline can be obtained also of the publishers of this volume. 



Red ink for marking the lines representing media and its branches in the 

 figures of wings. The use of red ink for this purpose adds greatly to the 

 clearness of the figures. In those cases where the stem of media or any of 

 its branches coalesce with another vein, this fact should be indicated by 

 drawing a red line, indicating the course of media, closely parallel with the 

 black line indicating the course of the vein with which media coalesces. 

 Red ink is also used for lettering the cells of the wings. 



Blank paper uniform in size with that upon which the figures are printed 

 for use in making the notes called for in the outline. This will permit the 

 keeping together of the drawings and notes for reference. 



