OVIPOSITION AND THE EGG OF LYCTUS BEUNNEUS. 
223 
Text-fig. 2 gives a series' of diagrammatic sketches showing the matura- 
tion of the egg in four stages. 
The movements of the larva are easily discernible within the intact 
covering of the chorion, and it is not until the larva has been feeding for 
some time that the chorion becomes broken by its movements at the posterior 
end and later injured in the process of the consumption of its initial food. 
PI. 12. fig. 4 depicts an egg in which the larva has commenced feeding on 
the residual yolk-mass in which its head is partially buried. (The bend in 
the egg was due to the movement of the larva when dropped into Carnoy II.) 
The photo shows that the chorion at the posterior end is broken, and that it 
is crumpled in the part occupied by the larva, whereas it is quite taut 
around the anterior part. 
Teit-fig. 2. 
-cK. 
fym,.— 
"ym-r 
ea. - — 
5. \^^ 
Development of the egg (diagrammatic). 1. Egg twelve liours old. 2. Several days later. 
3. About ten days old. 4. Mature egg. 
a., anterior pole ; cA., chorion; ea., embryonic area ; «?«., emhryo; /ym,, formation of 
residual yolk-mass; ^., posterior pole ; ;w., process or strand ; ?-?/ot., residual yolk- 
mass ; 1/., yolk. 
Locating the Eggs. 
In the first instance the beetles were caged in a ca\-ity (1^ inches in 
diameter) cut with a brace and bit in pieces of mahogany (4 inches by 
3 inches by 1 inch thick). The cavity, which was full of cracks, fissures, 
and crevices, was about i inch deep, and it and the surface of the piece of 
wood were covered with a piece of glass held in position with elastic bands. 
Shaving off the wood with a scalpel under binoculars in search of tho 
