BY R. J. TILLYAKD. 



113 



much weaker than that of the fore; and most of the main stem 

 of the media is obsolescent, from just distad of the posterior 

 arculus tu the median fork. The medio-cubital cross-vein is 

 placed much more distad than in the forewing. descending" from 

 M 3 upon Cu ]a . Cu 2 is also a very weakly indicated vein. There 

 are no true thyridia in the hindwing. 



Other differences between the two wings, apart from that of 

 size, are the obsolescence of the humeral cross-vein, the presence 

 of the frenulum, and the reduction of the jugal lobe, in the hind- 



wing. 



Comparison with the Venation in other 



Genera. 

 The pupal tracheation is not available for the study of other 

 genera of the Micropterygidce. This is, however, very little 

 drawback, now that we have the pupal tracheation of Eriocrania; 

 for we shall be able to show that the same type of venation holds 

 throughout the group, with only minor differences of detail. 



Text-tig..l. 

 Winga of Mnemonica subpurpurella Haw., ( x 19). p<i, posterior arculus. 



The genus that is most nearly allied to Eriocrania is Mnemo- 

 nica (Text-fig. f»), which was separated out from the older genus 

 Eriocrania by Meyrick in 1912, its type {subpurpure.il a Ha worth) 



