24 THE MAYFLY 



the segment, and ending at its thickend hind 

 margin abruptly, and a pair of fine curved 

 longitudinal lines interposed between these 

 spots, often effaced. The ventral markings are 

 a pair of longitudinal, sub-parallel, abbreviated 

 fine black lines, and between them, near the 

 base of the segment, two shorter lines, conver- 

 gent towards each other. The markings are 

 upon a very light olivaceous ground colour." 



Mr. Eaton continues : 



" No. I (Ephemera vulgata) inhabits rather 

 warmer waters than No. 2 (Ephemera danica). 

 At Romsey I have found the nymph of No. i 

 in the ditches adjoining the river. In Dorset- 

 shire you would find it the abundant species 

 along the Stour, near Blandford and Wim- 

 bourne, where the banks and' bed of the river 

 are clayey or muddy. Common at Burton-on- 

 Trent. Doubtless the most abundant species 

 in the rivers of the eastern counties." 



Personally, I have only met with E. vulgata on 

 the Middlesex Colne, finding it in fair numbers 

 at Uxbridge, and on a deep and sheltered lake 

 up in the hills near Romsey, where I have taken 

 one or two specimens. 



To continue Mr. Eaton's descriptions : 



" Ephemera danica. The anterior four or 

 five abdominal dorsal segments are ivory-white, 

 marked on each side at the base with a broad 

 triangular pale cinereous blotch which points 

 backwards. In some of the hinder segments 

 (which are varied with pitch-brown or very 

 intense brown-ochre instead of cinereous) some- 



