I.XSKCT EiNlC.MJl'.S OK TIllC CODLINc; .MOTH. 243 



J'chniary 22, 9 p.m. — Codling- cgi;;' [a) : There is no change. 

 CotUing egg {b) '. The two smallest pupaj have shrunk and pro- 

 bably liave (lied. Codling egg (c) : Pupa? are in the same con- 

 dition. 



Fcbniary 2t„ 9 p.m. — ^Codling egg (a) : There is no change. 

 Codling egg (b) : The adult parasites have emerged. Codling egg 

 (c) : There is no change. 



Fcbniary 24, 9 p.m. — Codling egg (a) : Parasite number 

 (6) is moving and trying to make its exit by movements of legs 

 and feelers, pressing the body against the codling egg shell. Cod- 

 ling" egg (b) : One more adult parasite has emerged, and another 

 is attempting to do so. Codling egg (c) : At 11 a.m. all the 

 adult parasites have emerged from the codling egg except one, 

 Avhich attempts to make its exit by movements of the head and 

 feelers. There are only two openings in the shell of the codling 

 egg". A])parently a parasite emerges by simply breaking the 

 codling egg shell through pressing the head or body against it. 



February 25///. 9 p.m. — Codling egg (a) : Adult parasite 

 number (6) has ceased to attempt to emerge, and has died. Para- 

 site number (3) is an active adult, and is struggling to emerge. 

 Codling egg (b) : Two pupae have died. 



February 26, 9 p.m. — 'Codling egg (a) : Parasite number 

 (3) has emerged. The rest have died in the pupal stage. 



The results of the observations of the development of T. 

 Intea in a codling egg show that the incubation period of the 

 egg was less than 24 hours, the larval stage com])rised about 3 

 days, the prepupal stage was about i day, and the pupal stage 

 was from 4 to 5 days. Under out-of-doors conditions the stages 

 would probably be longer or shorter, depending on the tempera- 

 ture. 



Egg-Laving Orservations. — Table i records observations 

 showing the influence of the number of insertions of an egg 

 parasite's ovipositor in a codling egg on the number of parasites 

 emerging from a parasitized codling egg. 



The parasite was enclosed in a test tube with numbered 

 codling eggs which had previously been laid on a leaf. The 

 insect was observed under a binocular microscope. 



In laying, the position taken by the insect w^as as follows : 

 The antennae were directed downward with the exception of the 

 basal segment, which was directed forward. The tibia of each 

 leg was directed backwards. The femur of the two front legs 

 was directed forwards. The insect's body took the position of 

 an angle of about 35° with the surface of the codling egg. 



As soon as the parasite was placed with the eggs in a test 

 tube, she immediately walked to codling egg No. 17. walked over 

 it a few seconds, feeling about the margin with the tips of her 

 antennae, apparently to be certain of directing the oviposition 

 in or near the centre. As the records illustrate, the parasite 

 sometimes inserted her ovipositor several times in a codling 



