ephemeriNjE. 559 



12. Baetis flaveola. 



Corpus omnino fulvum veljlavum ; alee hyalines aut basi subtinctee, 

 areola costali immaculata, venis transvenis nigricantibus op- 

 time determinatis. 



Baetis flaveola, {Kollar, MSS.) Pictet, Hist. Nat. Neur. Eph. 

 186, 12, pi. 23, f.4. 



B. flaveola? — Pale testaceous : antennae darker : abdomen pale 

 luteous, with narrow blackish bands on the sutures of the segments, 

 about twice the length of the thorax : setae whitish, very minutely 

 pubescent, without bands, more than twice the length of the body : 

 legs whitish, slender : fore-legs long ; femora with a brownish spot 

 in the middle and another at the tip : wings limpid ; veins brown- 

 ish, partly pale, not strongly marked. 



Subimago. — Paler: setae shorter: wings slightly opaque, pu- 

 bescent along the hind border ; veins pale or brown. Length of the 

 body 2\ lines ; of the setae 8 lines ; of the wings 9 lines. 



a — c. St. Martin's Falls, Albany River, Hudson's Bay. Presented 

 by Dr Barnston. 



13. Baetis guttata. 



Corpus fulvum, fusco maculatum ; pedes distinctissime maculati 

 aUe hyalince aut basi subtinctee ; areola costalis fuscescem 

 in varia. 



Baetis guttata, Pictet, Hist. Nat. Neur. Eph. 187, 13, pi. 24, f. 3. 

 Switzerland. 



14. Baetis Australasica. 

 Areola costalis venis transversis nigro maculatis. 



Baetis Australasica, {Kollar, MSS.) Pictet, Hist. Nat. Neur. Eph. 

 189, 14, pi. 24, f. 1. 



New Holland. 



