Notes on the Ephemeridce. 401 
diaphnna has scale-like hind wings. The word "lepidota" 
(Greek for scaly) occupies in the other diagnoses the 
position which is held by " diptera" in the diagnosis of E. 
rufida, and therefore no doubt refers to the scale-like hind 
wings. E. luteola is therefore probably the female of the 
Baetis or of the Centrojjtilum. The Avords " pedibus 
setisque albis" are more generally applicable to the female 
Centroptilum than they are to the female Baetis.'] 
Page 110. Genus Baetis. Imago. — You have for- 
gotten to state the number of joints in the posterior tarsi 
of Baetis. 
[They are four-jointed, and the proximal joint is longer 
than the second or third.] 
Page 111. Baetis binoculatus. Yon write binoculatus, 
Linne ; I would never correct Linne in this way ; the 
name bioculata is adopted by all writers. 
[Messrs. J. W. Dunning and G. R. Crotch, both 
persuaded me to make the correction. We talked over 
the matter before the Catalogue of British Neuroptera was 
published in 1870.] 
Page 118. Baetis pumilus. [In June, 187 1^ near 
Ashbourne, in Derbyshire, whilst searching in a very 
small streamlet for nymphs of Nemoura (the N. cinerea of 
M'Lachlan's Catalogue) at noon, I found a female of B. 
pumilus beneath the water depositing her eggs upon the 
under surface of a stone, which I turned up. The eggs 
were arranged close together in a single layer in the form 
of a roimded patch. When she was removed from the 
water, her wings erected themselves. Shutting her up 
in a box for security I hastened home, and (in about a 
quarter of an hour after her first capture) placed the stone, 
with her upon it, in a glass jar partly filled with water, 
leaving her, without fiu^ther interference, exposed to the 
air. She very soon crept down to the water, and after 
feeling it carefully with her anterior legs, walked into it. 
As she entered it, her wings once more collapsed, folding 
together neatly lengthwise, so as to form a narrow pointed 
sheath, which extended over the back of the abdomen as 
far as the base of the set^. If I am not mistaken the 
setffi were placed together side by side. She remained 
submerged several hours, quite at her ease, and died in 
the following night Avithout returning to the air, — living 
F F 2 
