STATES OF INSECTS. (Hgg.) | 69 
sure it burst and let out the eggs. ‘Though resembling 
the packet of P. grandis in shape and other circumstances, 
it was nothing like jelly, but had rather a waxy appear- 
ance, and seems to have been covered by a membrane: 
so that the excluded larvee must probably have eaten 
their way out of it. I have still by me, in 1828, speci- 
mens of these egg-packets, which, after the lapse of so 
many years, retain their original form and colour. It 
is not improbable that other species extrude their eggs 
in a similar case. Scopoli says of Perla bicaudata, that 
the female carries about under her belly her eggs united 
into a globe, like Lycosa saccata*. ‘The eggs of Botys 
Potamogata are also enveloped in a gelatinous substance, 
and the mass is covered with leaves®. 
Insects of the Diptera order also, like frogs and toads, 
commit their eggs to the water imbedded in masses of 
jelly. Dr. Derham describes two different kinds of 
them, in one of which the eggs were laid in parallel rows 
end to end, and in another in a single row, in which the 
sides were parallel®. But the most remarkable and 
beautiful specimen of this kind that I ever saw was one 
that, many years ago, I took out ofa pond at Wittersham 
in Kent, from which I requested a young lady to make the 
drawing I send you’. ‘The mass of jelly, about an inch 
and a quarter long, and rather widest in the middle, was 
attached by one end to some aquatic grass, and from one 
end to the other ran a spiral thread of very minute eggs, 
the turns of the screw being alternately on each side. 
The mode of exclusion of the eggs of the Blatte, which 
are engaged for a whole week in the business of ovipo- 
* Ent. Carniol. 269. n. 705. > Reaum. ii. 401. 
“In Raii Hist. Ins, 264. 4 Prats XX. Fic. 24, 
