a correction. 

 Dear Sir, — 



In my article which appeared on pages 21-23 of the Canadian Ento- 

 mologist, Vol. xiii. No. 2, the species was erroneously accredited to 

 Plusia precationis Guenee, instead of to Pliisia simplex of the same 

 author. This mistake on my part was owing to the fact that the moths 

 from which I obtained the eggs had the metallic spots in the centre of the 

 fore wings nearly as they are in a precationis which Mr. Grote determined 

 for me. I have been enabled the present season to correct my former 

 mistake by the use of the excellent descriptions of the Plusia moths given 

 by Prof Cyrus Thomas in his Fourth Report. 



On the 2ist of November, 1881, I received from the Editor of the 

 Germantown Telegraph a box of insects for determination, and in the 

 letter which accompanied the box the Editor stated that the worms which 

 he sent me were very destructive to the celery in many gardens in his 

 locality. 



These celery worms agreed precisely with the description of the 

 simplex larvae referred to above. They difler from the larvse of brassica, 

 as given by Prof Riley, only in having the spiraeas ringed with black ; 

 and both of these larvae differ from that of precationis by not having a 

 black stripe on each side of the head. In all other respects these three 

 larv£e appear to be utterly indistinguishable. 



D. W. CoQUiLLETT, Woodstock, 111. 



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