802 MICROPTERYGINA 



species) a second additional vein rising out of 12 near base. 

 The possession of these structures causes the neuration of 

 Palaeomicra to be practically identical with that of Rhyacophtta, 

 a genus of Trichoptera (caddis -flies) ; the only important 

 difference is that in Rhyacophila there is an additional vein rising 

 out of 4 in the forewings, but it is interesting to observe that 

 this very vein has disappeared in the hind wings. Nothing at 

 all approaching this form of neuration is known in any other 

 Order of insects, and it is highly improbable that so complex a 

 type could have originated twice independently ; there need be 

 no hesitation, therefore, in concluding that the relationship 

 (which is equally indicated in the mouth -parts and other 

 structures) is real. 



TABULATION OF GENERA. 



Forewings with 7 and 8 separate . 2. ERIOCEPHALA. 



,, with 7 and 8 stalked . 1. MICROPTERYX. 



1. MICROPTERYX, lib. 



No mandibles. Tongue short. Labial palpi moderate, 

 porrected, hairy beneath. Posterior tibiae thinly hairy above. 

 Forewings: 7 and 8 stalked, 7 to apex, 9 sometimes absent, 11 

 and 12 sometimes with additional branches (subpurpiirella). 



Hindwings as forewings, but 9 

 and additional branches of 12 

 always absent. 



As now restricted, the genus 

 is confined to N. and C. Europe, 

 and includes only one or two 

 other species besides those here 

 described ; but probably more 

 remain to be discovered, as few 

 workers have given attention 



Neuration of Micropteryx subpurpureUa. to the group. The Species are 



mostly very similar in appearance and habit, and require care 

 in discrimination. The abdomen in $ is furnished with a 

 serrated lancet-like implement for egg-deposition. Ovum 

 rounded-cylindrical, placed in a pocket cut within the substance 

 of the leaf. Larva apodal, head small, 2-4 broad, with minute 

 protrusible subdorsal and supraventral papillae, 5 with lateral 

 projections, thence tapering posteriorly ; mining blotches 

 (originating as a gallery) in leaves of Amentiferae, excrement 

 forming small filiform sections. Pupa subterranean. 



