Okamoto : On the Life-history of the Apple Fruit-miner, Argyresthia conjugella Zell. 2 I ^ 



in the shell. 



Changes diiriiig mctibation — The newly laid egg is of a translucent whitish 

 color, often with a yellowish tinge. Observations upon many eggs show that 

 from two to four days with an average of three days after the deposition of the 

 ^Sg a yellow ring makes its appearence in its interior. This ring disappears in 

 five to six days and in its place the larva can be seen, the "black spot" which 

 consists of the head and cervical shield, being the most conspicuous part. 



The Larva. 



At the time of hatching the young larva is milky white in color, with large 

 shiny black head, and black cervical and anal shields. The body shows from six 

 to eight regularly arranged dark spots with short hairs. 



If hatched upon an apple, a young larva seeks soon a place to enter ; when 

 hatched upon the leaves, it may not find any apple for some time, and meanwhile 

 it seems to be obligeil to feed upon small portions of the leaves. 



Description of the full-grown lafva — When full-grown, the larva is about 6 

 mm. in length. The majority are of a light pink or flesh color, which is much 

 lighter on the under side. The head is brown in color, and the cervical and anal 

 shields are also brown. The segments of the body show from six to eight regular- 

 ly arranged brown spots, in which the minute short hairs are situated. Beneath 

 the under lip is the spinneret, from which the silken thread is drawn. The larva 

 has eight pairs of legs. The first three pairs are situated on the thorax, and are 

 three jointed. Later these form the legs of the adult insect. The five pairs of 

 the fleshy abdominal legs disappear in the pupal stages of the insect. The first 

 four pairs of abdominal legs are armed with circles of hooks, while the hooks on 

 the two pairs at the end of the body are arranged in a semicircle. The spiracles 

 or breathing apertures of the larva are arranged on both lateral sides of the 

 segments (with exception of the second, third and anal segments) of the body. 



Hoiv the larva enters the fruit — The place of the entrance of the apple fruit- 

 miner for the most part is on the side of the fruit. It is very common to observe 

 a gummy matter exuding from the place of entrance of the larva. The larva 

 either squeezes its way or tunnels into the fruit. The tunnels are numerous and 

 extend in all directions. A scar or rough spot is a favorite place to enter into, as 

 the jaws slip on the smooth skin. 



