EPHEMERIN.E. 557 



4. BAETIS MONTANA. 



Oculi cyanei ; thorax niger ; abdomen viridescens, innotatum ; alee 

 hyalina, aut basi subtincta, areola costali basi hyalina apice 

 colorata. 



Baetis raontana, Pictet, Hist. Nat. Neur. Eph. 172, 4, pi. 20, f. 3. 

 a, b. ? England. Presented by F. Walker, Esq. 



5. Baetis purpurascens. 



Oculi cinerei ; thorax et abdomen pallide violacea ; alee hyalina:, 

 aut basi subtincta, areola costali basi hyalina apice colorata. 



Baetis purpurascens, Pictet, Hist. Nat. Neur. Eph. 174, 5, pi. 20, 



f. 4. 

 Switzerland. 



6. Baetis lateralis. 



Corpus fulvum,fusco maculatum ; caput maximum; oculi maris 

 remoti ; pedes immaculati aut vix maculati ; alee hyalina aut 

 basi subtincta?, areola costali pallida invaria. 



Baetis lateralis, Curt. Phil. Mag. 1834, 121. Steph. III. Brit. Ent. 

 Mand. vi. 65, 8. Pictet, Hist. Nat. Neur. Eph. 175, 6, pi. 21 . 



a. England. Presented by F. Walker, Esq. 



7. Baetis semicolorata. 



Femora anteriora fusca ; ala dimidio basali valdc colorata, areola 

 costali immaculata. 



Baetis semicolorata, Curt. Phil. Mag. 1834, 121. Steph. III. Brit. 

 Ent. Mand. vi. 64, 7. Pictet, Hist. Nat. Neur. Eph. 7. 



Europe. 



