186 



Sub-group 1. 



Prothorax omnino niger. Alarum reuEe cinereo obscuriore 

 marginatae. 



23. NeMOURA NITIDA. 



Nemoura uitida, Pictet, Mem. Soc. Phya. Geneve^ vii. 179, 5. Hist. 

 Nat. New. Peri 392, 16, pi. 51, f. 4—8. 



Europe. 



Sub-group 2. 



Prothorax flavo marginatus. Alarum vense cinereo non iiebu- 

 losse. 



24. Nemoura lateralis. 



Nemoura lateralis, Pictet, Mem. Soc. Phys. Geneve^ vii. 180,6; 

 Hist. Nat. New. Perl. 395, 17, pi. 52, f. 1—3. 



Swiss Alps. 



Group 2. 



Femora postica omnino fulva, aut striga gracili nigra lantuui 

 signata. Alae laete fuscEe. 



25. Nemoura marginata. 



Nemoura marginata, Pictet, Mem. Soc. Phys. Geneve, vii. 181,7; 

 Hist. Nat. Neur. Perl. 397, 18, pi. 52, 1. 4—6. 



Switzerland. 



Sub-sect. 2. 

 Alse opacsB, nigro-fuscEe, basi flavae. 



26. Nemoura humeralis. 



Nemoura humeralis, Pictet, Mem. Soc. Phys. Geneve, vii. 184, 11 ; 

 Hist. Nat. Neur. Perl. 399, 19, pi. 52, f. 7—2. 



Switzerland. 



