Q [June 
On the 10th of February, the entire surface of the mouth turned 
dark brown, and all the various spots and markings on the anterior 
portion of the body of the larva became merged in one general dull 
blotch. The larva then re-commenced feeding, but at first very slowly, 
and appeared to be in a very weak and languid state. As the food 
passed into the stomach, the anterior portion of the dorsal vessel 
(which before the larva began feeding was invisible) became tinged with 
green, and after a short interval its posterior portion assumed a darker 
tinge. As soon as the larva has refreshed itself with a little food, it 
rested for a time, and, during this interval, threw off the old covering 
of its head. (On one occasion, as soon as a larva began feeding after 
moulting, I watched it narrowly, from the instant it swallowed the first 
mouthful of food to the moment it ejected the first pellet of " frass," and 
found that it occupied precisely half-an-hour, thereby implying that it 
requires that amount of time, after deglutition, for the food to be 
digested, the nutritious properties extracted, and the coarse indigestible 
portion finally ejected as "frass.") 
After this partial moult, the larva, as if trying to make up for lost 
time, fed with remarkable rapidity, its jaws being in constant motion ; 
and as it ate its way forwards, the anterior portion of its body became 
stouter. By the time the larva had fed for a space of six hours, it had 
so far extended its mine as to enable it to withdraw half of its body 
from its old skin, and then the " frass " gradually began to accumulate 
in the partially thrown-off skin, the latter serving as a receptacle in 
which the " frass " was deposited ; and as the larva moved the extremity 
of its body about within the walls of its old skin, the " frass " was 
distinctly observable as it fell pellet by pellet. 
The "frass " did not flow in a continuous line to the extremity of 
the body of the larva, but appeared in pellets at the base of the ante 
penultimate segment ; each pellet then slid gradually down till it 
arrived near the centre of the penultimate segment, when it seemed to 
be taken in charge by the branched portions of two darkish coloured 
muscles, and conducted to the point where the remaining portions of 
the muscles lay parallel with each other down the posterior portion of 
the penultimate and the anterior portion of the anal segments ; these 
muscles then immediately expanded, and received the pellet of " frass," 
and guided it to their extremities, and then deposited it near the 
middle of the anal segment, out of wliich it gradually slid, and became 
intermixed with the other pellets of " frass " in the mine. 
(To be continued.) 
