BREEDING LARVA. 33 
their life. At the approach of cold weather, the breeding 
cage should be removed to the cellar and kept there until 
spring. The collector in his trips through the woods and 
fields will find many pupze; these should be brought home 
and placed in the breeding cage and the imago obtained. 
This method of breeding insects in confinement has many 
advantages, the most prominent being that the imagos ob- 
tained are perfect and not in that rubbed condition which is 
frequent in those caught with the net. 
Occasionally, a larva will fail to go through its proper 
changes. ‘This is generally caused by the presence of some 
parasite. ‘The most common of these parasites are Ichneu- 
mon larve. ‘The adult ichneumon stings the larva and lays 
its eggs ; these hatch and the progeny live on the juices and 
tissues of its host until at last it succumbs, and then the para- 
sites go through their changes and finally emerge as perfect 
insects. These ichneumon flies should be carefully preserved 
with full notes of the host, etc. 
Spiders and Myriapods may be found everywhere and are 
best preserved in spirit. With spiders should be preserved 
careful notes of colors, and the form of the web, whether 
vertical or horizontal, flat or dome shaped, etc. Especial 
pains should be taken to collect the male which is much 
smaller than the female and is frequently found with it. The 
two cannot be kept together alive as the female is so fond 
of her mate that she frequently eats him. Myriapods are 
rather difficult to preserve, because their integument is so 
thick that the alcohol does not readily penetrate and therefore 
the tissues of the body decay and the specimen falls to pieces. 
3 
