1920] Crampton — Lower Lepidoptera and Trichoptera 31 



Trichoptera, despite the fact that both micropterygoids and lower 

 Trichoptera exhibit a remarkable degree of similarity; and it is 

 therefore quite evident that it is not necessary to remove the 

 micropterygoids from the Lepidoptera to the Trichoptera, nor 

 is it necessary to regard them as representing a distinct order. 



It has seemed unnecessary to append a "bibliography" at this 

 point, since the more important reference works dealing with the 

 anatomy on the insects in question have been given in the text of 

 this article. If the reader is interested in the further study of the 

 anatomy of the micropterygoids, the following works, in addition 

 to those previously cited, may be of interest. Walter, 1885 (Jen. 

 Zeit. f. Wiss., 8, p. 755), on the mouthparts; Tillyard, 1918, Proc. 

 Linn, Soc. N. S. Wales, xliii, pp. 298, and 626, for wing structures; 

 and the excellent general description of the anatomy of all stages 

 of Mnemonica, by Busck and Boving, 1914 (Proc. Ent. Soc. 

 Washington, 16, p. 151). 



The following list of abbreviations applies to the figures of Plate 

 IV (illustrating the following article on genitalia of higher insects) 

 as well as to the plates of the present paper, and will therefore 

 serve equally well for both articles. Since homologous structures 

 bear the same label throughout the series of figures, it will be 

 unnecessary to give a more detailed description of the various 

 anatomical features of the insects under discussion. 



MICROPTERYGIDS PHILOPOTAMUS 

 LEPIDOPTERA \ / TRICHOPTERA 



MECOPTERA \m/ NEUROPTERA 



Fig. 1. Lines of descent of Lepidoptera and Trichoptera. 



