334 



THE RIVER-SIDE NATURALIST. 



rally only two or three, at times running into one another ; 

 posterior wings colourless except at the extreme ends, where 

 they are brownish. A dark spot in the centre of each wing. 



The Sub-Imago only differs in that the colours are more 

 confused. Spots on abdomen less distinct. 



The female Imago is paler in head and thorax, wings 

 much more lightly tinted with a greenish-yellow, the spots 

 on the wing more separated. The posterior wings have 

 the extremities slightly darker than the rest, the centre 

 spot almost indistinct. 



The Sub-Imago only differs in its paler colouring. 



Eaton, 1883. EPHEMERA VULGATA. Male Imago. Head 



EPHEMERA VULGATA. 

 i, Sub-Imago, male. 2, Female Sub-Imago. 



peach-brown ; eyes sepia-brown ; abdomen pale olivaceous, 

 with pitch-brown markings tinged with ochre at the upper 

 segments and in the middle line of some of the hinder seg- 

 ments ; legs olivaceous or olive-brown ; setae and forceps 

 pitch-brown and lutescent ; wings pale greenish-grey tinted 

 or yellowish-green, tinted with black nervations, many cross 

 veinlets bordered with pitch-brown ; spots on the wing 

 very marked, pitch-brown. 



The Sub-Imago. Wings at first yellowish or greenish- 

 grey, changing to ancreous, broadly tinged with black-grey 

 along the terminal margin ; discal spots fuscous, cross 

 veinlet edged with ivory-black. 



