258 Psyche [December 
Psyche, 1924 Vol. 31, Plate 9 
Forbes — Wing Folding in Beetles 
Explanation of Plate 9. 
1. Telephorus species (Lampyridsd). Venation. 
2. Same. Folding pattern. (Areas reversed in folding black). 
3. Same. Mechanics of folding. (Lines of stiffness are 
represented by heavy solid lines, lines of tension by chain-lines). 
4. Cicindela sexguttata (Cicindelidse). Venation. 
5. Same. Folding pattern. 
6. Same. Mechanics of folding. 
7. Central costal part of fig. 6, more enlarged. 
8. Method of stiffening apical part of wing, illustrated by 
a model. 
