HYMENOPTERA. — ICHNEUMONIDZ. 145 
ascertained that this insect is parasitic upon a species of Tephritis, 
which is found in that situation. (bid. Add. vol. vii.). M. Audouin, 
however, has shown me the details of the history of a species which 
he had reared from a larva, which he was led to believe fed upon the 
pith of a reed in which it was found, since no traces of any insect 
upon which it could have subsisted were to be seen; but this ob- 
servation does not appear to me sufficiently conclusive. 
In Corbyn’s India Review (Nov. 1836.), an account has been pub- 
lished by Mr. Baddeley, of one of the Adsciti which inhabits the galls 
on the leaves of Ficus racemosa in India, caused by a Cecidomyia, 
and in which it is asserted that the Ichneumon- and Cecidomyia- 
larvee “ live independently, and feed upon the vegetable juices without 
detriment to each other; although, at the first, the Ichneumon larva 
lives and grows for a certain time at the expense of the Cecidomyia 
larva. The former, however, subsequently acquires herbivorous 
habits, feeding in concert on the juice of the interior of the gall; in 
this occupation it continues to grow without detriment to the other 
inmate. The natural history of the two species appears to have been 
very carefully traced and figured, with numerous details, leading to 
the belief in the correctness of this statement. 
The developement of these parasites* within the bodies of other 
insects was for along time a source of much speculation amongst the 
earlier philosophers, who conceived it possible that one animal had 
occasionally the power of being absolutely transformed into another ; 
thus, Swammerdam records, as a “ thing very wonderful,” that 545 flies 
of the same species were produced from four chrysalides of a butterfly, 
“so that the life and motion of these seems to have ¢ransmigrated, into 
those of the 545 others.” (Hill’s Trans. of the Bibl. Natur. p. 122.) 
The eggs of the genus Ophion are of a singular form (jig. 76. 7.) 
being somewhat bean-shaped, and attached near one end toa long, slen- 
der, and curved peduncle, by which they are attached (unlike the ma- 
jority of the eggs of this family, to the surface of the body of the larva of 
Cerura vinula, the puss moth); when the eggs are hatched, the larva 
retains itself in this situation, the extremity of its abdomen being 
retained within the shell of the egg (jig. 76. 8.), whereby they are 
enabled to suck the juices of their victim (De Geer, Mémoires, tom. ii. 
tab. 29.) + Gravenhorst first noticed (Ichn. Hur. ii. 151. and 222.), 
* See observations under the section Fossores, as to thecorrect application of this term. 
t Réaumur (Mém. vel. ii. pl. $4. f. 4, 5.) has represented a caterpillar, whieh 
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