94 Scientific Proceedings, Royal Dublin Society. 



have been imported (Moore and More, " Cybele Hibernioa," p. 151) 

 makes the importation of the insect highly probable. 



On the other hand, may it be possible that we have had 

 lately developed in our islands a really new species, an offshoot of 

 T. viburnana, which for some unknown reason has changed its 

 food-plant ? If this view be accepted we must give up the identi- 

 fication of T. donelana with Herrich-Schaffer's figure. 



In concluding this Paper I acknowledge, with many thanks, 

 the kind and invaluable help I have received in its preparation 

 from Mr. W. Warren. I am also indebted to Mr. W. F. Kirby 

 for assistance in looking up the scattered literature of the subject. 



EXPLANATION OF PLATE VII. 



Fig. 5. — Shoot of Pinus sylvestris, showing habit of Larva of T. done- 

 lana. Natural size. 



Fig. 6. — Cocoon of T. donelana, cut open, with Pupa within. 

 Natural size. 



