PARASITIC ON SPIDERS. 239 
availed myself of the assistance of Mr. Peter Barrow, 
of Manchester, who obligingly transcribed all that the 
Swedish entomologist had published on the subject, 
and transmitted it to me in Wales. 
On perusing the description of the female Zchneuwmon 
bred from the larva which formed the subject of his 
investigations *, I found that it presented several 
decided points of difference in colour from the insect 
observed by me, from which it may be distinguished 
at once by the two longitudinal yellowish lines on its 
thorax. 
It scarcely admits of a doubt that the whitish, oval 
object noticed by Baron Walckenaer on a specimen of 
Linyphia montana +, which seems to have induced no 
small degree of surprise and perplexity in the mind 
of that accomplished arachnologist, was the parasitic 
larva of a small species of Ichneumon. 
* «Mémoires pour servir 4 l’Histoire des Insectes,’ tom. ii. 
p. 866. 
+ ‘Histoire Naturelle des Insectes Aptéres,’ tom. i. p. 176. 
