16 MODERN ARRANGEMENT OF 
other spiny caterpillars; nor is their dwelling in 
the folded leaf so securely constructed, as to prevent 
the intrusion of such unwelcome visiters, a cireum- 
stance always attended with a mortal result.” 
Professor Rennie mentions a similar circumstance. 
He says, “ We happened to see a remarkable in- 
stance of this last summer, (1828,) in the case of 
one of the Lilac eaterpillars, which had changed 
into a chrysalis within the closely folded leaf. A 
small ichneumon, aware, it should seem, of the 
very spot where the chrysalis lay within the leaf, 
was seen boring through it with her ovipositor, and 
introducing her eggs, through the punctures thus 
made, into the body of the dormant insect. We 
allowed her to lay all her eggs, about six in num- 
ber, and then put the leaf under an inverted glass. 
In a few days the eggs of the Cuckoo Fly were 
hatched, the grubs devoured the lilac chrysalis, and 
finally changed into pupe, in a case of yellow silk, 
and into perfect insects like their parent.” * 
« There must then,” continues M. Sepp, “ I 
think, be some other reason for these caterpillars 
hiding themselves in this manner, and I am in- 
clined to believe it can be no other than their de- 
sire to be solitary. In accordance with this view, 
we find the eggs always laid singly and apart ; 
and it is well known to naturalists, that all cater- 
* Insect Architecture, p. 174. 
ae Yn 
