630... General Notes. [June, 
ENTOMOLOGY. 
Eaton’s MONOGRAPH OF THE MAY-FLIES, Part I.—This is a 
-well-worked and finely-illustrated memoir, which will necessarily 
remain a classic. For the first time we have a thorough treat- 
would suggest. 2 
The facts stated as to the habits and mode of oviposition arè 
fresh, and will be doubtless novel to our readers. 
The popular superstition, says Mr. Eaton, that Ma fess 
strictly ephemeral, is fallacious in most instances. ‘Tt is 
that the adult insect cannot eat, owing to atrophy of its mouth- 
organs and to the condition of its alimentary canal; but, ce 
ed that the air be not too dry, the imagines of many uote 
live without food several days. Tradition states that Se 
a female Cloëon alive three weeks; this is an exception Ja 
period, for in general an individual in confinement becom th 
May-flies are 
more 
s, the latter lasts & 
takes place within ê 
h skin, its 
fugitive, passing away in the course of the evening Or ibimag? 
ing. In some genera of short-lived Ephem o S ie 
skin is partially or altogether persistent ın on al 
sexes; and such portions of it as may be shed are moleo the 
the insect is in full flight.” The longer- lived api the others 
The change from nymph to subimago is effecte p by gas hich 
the water with the wings erect awa! 
ing to shelter. Fluttering stea 
RTs eee ae Seep gn a me cae AEN, 
and : o 
e moult having beet 
transacted in the ordinary manner, the subimago, “ment A i 
ats aloft, 0 : 
