FHE 
{ERICAN NATURALIST 
_— 
= 
VoL. XXXIII. November, 1899. No. 395. 
THE WINGS OF INSECTS 
J. H. COMSTOCK and J. G. NEEDHAM. 
CHAPTER V. 
The Development of Wings. 
I. First APPEARANCE, POSITION, AND GROWTH OF WINGS. 
Tue development of wings is one of the many subjects of 
biologic study which have been first undertaken in their more 
difficult phases. The internal processes concerned in the mak- 
ing of an insect wing were first studied by Weismann in the 
Diptera,! and in those Diptera in which conditions are most 
difficult of interpretation. One by one forms of less complex- 
ity have been studied, and a rational account of the process of 
wing development has at length found its way into several text- 
books. The process is still most fully illustrated, however, by 
studies of representatives of the two groups which are least 
typical for insects as a whole, the Diptera and the Lepidoptera. 
Rehberg’s inconclusive paper on wing development in Blatta 
1 Weismann, A. Zeit. wiss. Zool., vol. xiv (1864), pp. 187-336. 
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