198 



TEXT-BOOK OF ENTOMOLOGY 



psyche). These also occur on the veins, and detached ones near 

 large one-jointed hairs, or hair-scales, said by Kellogg to be stri- 

 a a' A 



elm 



1111 



U. 



FIG. 227. View looking 1 down upon the 

 upper (i.e. exposed) surface of one of the large 

 scales situated on the veins of Dana-is plex- 

 ippus, about four days before emergence: 

 elm, chitinous pillars found in scales. A, a 

 smaller scale. , ', sections of the scales. S, 

 leucocyte found in the larger scale. After 

 Mayer. 



FIG. 22S. Scale-follicles: A, of a scale 

 of <;<illi-r!<t ni< I/oiiflln : r. neck-ring. />', 

 the same of Fchjauniniliix /ililiniK. /'. 

 the same of a hair on inner edge of hind 

 wing of Lycctn-d alfa-ix V . After Spuler. 



ated. Kellogg has detected these scale-hairs, as he calls them, in 

 Panorpa. 



The "hair-scales" of the phylogenetically older Trichoptera cor- 

 respond to certain scales of Lepidoptera, especially the Fsychidse 



FIG. 229. A, portion of wing of a caddis-fly (Mystacides'K B, enlarged, -howintr the undroconia 

 and hair-scales. C, a separate anclp.eoiiiiini. --After Kcll(i-u 



(Spuler), variously called " plumules " (Deschamps). " battledore 

 scales," also certain minute cylindrical hairs. To these scent-scales 



