The Currant-Stem Girdler. 



47 



has been recorded in previous records ; from the middle to the 

 last of May seems to be their normal period of emergence. 



— .IT- —. -I Egg-laying . — As no one had recorded 



any observations upon the habits of the 

 adult insects, we were much interested 

 to know how the female laid her egg, 

 and why and how she girdled the cur- 

 rant shoots. Therefore, when a male 

 and female emerged in one of our cages 

 on May 2d, a special effort was made to 

 cater to every whim they might manifest. 

 Their " native heath " was imitated, so 

 far as possible, by placing several 

 freshly-cut currant shoots in a roomy 

 cage. The pair of saw-flies were then 

 carefully transferred to this cage. As 

 though apparently appreciating the 



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I. in 



^mm 



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lb. — a 



twj curra-nt stems cut open to show the tunnels made by the larva. '1 lie 

 cocuon is shown in the lower end of the tunnel in the right-hand stem, and 

 it has been removed in the other stem to show the larva. Natural sise. 

 b, the cocoon and larva enlarged about two and a half times. The pupa 

 is shown (enlarged) between the two stems. 



