THE MONTHLY BULLETIN. 



203 



Hibernation. The insect has no true hibernation period. The cold 

 weather stops the ih'velopment. The insect passes the winter as a rule 

 in the last larval or pupal stages. The mortality is much less in these 

 stages than in tiie younger. They can be successfully kept m cold 

 storage during tlie summer months, the temperature delaying the 

 development. 



The Egg. (Figure 60.) The eggs of CaUiephialtes, as luis l)een 

 stated, are deposited singly and may be placed at any point within the 

 cocoon of the codling moth larva. They are frequently deposited on 

 the larva and several may be placed in the same cocoon. 



The average length of fifteen eggs of tliis parasite was found to be 

 1.7 nun. and the average width .3 mm. Tlie longest egg measured 

 1.9 mm. in length, while the shortest measured 1.5 mm. in length. 

 They are milky white in color, elongate, the two poles are of une((ual 

 size, the larger" being slightly pointed and tapers oft' gradually to a long 



Fig. 60. — Eggs of CaUiephialtes 

 sp. Greatly enlarged. (Original.) 



point at the other pole. In one plane there is a perceptible curve from 

 pole to pole as shown in the photograph. The egg-shell or chorion is 

 sculptured in the form of elliptical protuberances arranged in the form 

 of an irregular hexagonal pattern. As incubation proceeds the yolk 

 draws away from the poles leaving a semitransparent space at each 

 end of the egg. The incubation period for thirteen eggs at a mean 

 temperature of 62° F. was sixty-eight hours. The chorion begins to 

 shrivel up at the time the larva is about to emerge and after emergence 

 is a colorless mass still retaining its sculpture to some extent. 



The First Stage Larva. (Figure 61.) The newly emerged larva is 

 quite unlike the last stage, is of a milky white color with a slight yel- 

 lowish tinge in the abdominal region, due to the contents of the digestive 

 tract. In this stage the head is the most prominent portion of the 

 larva. The size of the head averages .25 mm. in length and .24 mm. 

 in width. There are thirteen body segments. The antennal protu- 

 berances are prominent. The newly emerged larva is slightly smaller 

 than the egg and averages 1.2 mm. in length by .3 mm. in width. The 

 smallest newly emerged larva was 1 mm. in length by .3 mm. in width, 

 the largest 1.5 mm. in length by .35 mm. in width. The mandibles are 

 of the same shape as those of the later stages of the larva but the oral 

 ring is not so plainly marked as in the following stages. 



2—10522 



