EPHEMERIN^E. 557 



4. BAETIS MONTANA. 



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

 hyalince, aut basi subtinctce, areola costali basi hyalina apice 

 colorata. 



Baetis montana, 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 hyalince, 

 aut basi subtinctce, 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 hyalince aut 

 basi subtinctce, areola costali pallida invaria. 



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

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



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



7. BAETIS SEMICOLORATA. 



Femora anterior a f us ca ; alee dimidio basali valde 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. 



