The origin and develoiiment of the wings of Coleoptera. 



529 



3) Enclosed type = Pieris type of Gonin. The fundament 

 is invaginated, then evaginates, the lips of the cavity of the invagination 

 close so that the fundament lies in a closed sac connecting with the 

 body wall by a short peduncle. CoccincUidae and Chrysomelidae in 

 Coleoptera, all Neuroptera and Lepidoptera. 



Fig. C. Diagrammatic representation of the origin and development of the "en- 

 flosed tyi^e" of imaginai disc. 



4) Stalked type = Jfwsca type of Gonin. With the fundament 

 formed and inclosed as in the preceding type, but with the peduncle 

 much attenuated and the fundament lying some distance within the 

 body cavity. Musca and allied forms. 



Fig. D. Diagrammatic representati<m of the origin and development of the "stalked 

 type" of imaginai disc. 



Zool. Jahrb. XVII. Abtli. f. Morph. OA 



