THE WINGS OF CHRYSOPIDM 



189 



Fig. 182. — Wings of a psychopsid. 



(n) THE WINGS OF THE CHRYSOPID^E 



The wings of the Chrysopidte are characterized by a very remarkable 

 and distinctive type of specialization, the details of which can be under- 

 stood only by a study of the tracheation of the wings. 



A brief account of the wings of Chrysopa plorabunda showing the 

 essential features of this type of specialization was published by McClendon 

 ('06) ; and, quite recently, a much more extended one, based on an Austra- 

 lian species, Chrysopa signata, has been ptxblished by Tillyard ('16). So 

 that now the structure of these wings is well understood. 



In the preparation of the present account I have made use of the papers 

 just cited, and I have been materially aided also by Mr. R. C. Smith, who 

 during the year previous to the appearance of Tillyard's paper devoted 

 himself to the study of this problem. Mr. Smith has bred many indi\'iduals 



