REVIEWS. 
toe 
THE DEVELOPMENT OF CHLOEON (Ephemera) DIMIDIATUM. By Sir 
John Lubbock. Parts I. II.. From the Transactions of the Linnean 
Society, London. Vol. XXV. 4to, 1866. 
One of the most interesting discoveries in ‘entomology is the fact 
that the May-fly, or periei during its development from the time of 
leaving the egg up to maturity, moults its skin nineteen times before 
leaving the water, and once afterwards on arriving at the winged 
state. 
All the books teach that there are three distinct states of the in- 
not fixed and absolute. In the beetle or butterfly, the grub or cater- 
pillar certainly seems very distinct from the chrysalis. But we have 
in the collection of the Essex Institute a series illustrating the trans- 
formations of the caterpillar into the pupa or chrysalis, which show 
to the student. There is also a gradual change of form from the pupa 
to the imago or perfect state, which most observers have not noticed. 
The writer has shown* that the Humble-bee, before reaching the 
winged state, Saar at least ten times, and probably a emery num- 
ber. The bee-state is reached by a very gradual change of form. The 
newly hatched sake differs but slightly in appearance from ie pekom 
embryo just before hatching. The worm-like larva merges gradually 
to th i 
s almost ible to say absolutely keg is pupa and which imago, 
from the inspection of specimens before u _— metamorphosis İS 
Tint a pih and evolution of had to speak, at certain 
intervals to adapt it to certain modes or stron of life. In those 
ee ee 
- __ *Observations ‘on the Development and Position of the H era, with notes on = 
of 
_ Mepptoloay oie Insects. s. bya. B. Paci „Packard, jr. From the of the Boston 5>- 
(428) 
