AGLOSSA OUPEEALIS. 37 



month — 17th of November — they had not grown 

 much, but a fortnight later again the largest was 

 9 mm., and this still was the length of one examined 

 after hibernation on the 4th of March, 1883 ; on the 

 26th of March one was turned out which measured 

 13 mm., but by the 1st of May most of them had not 

 yet attained that length ; by the 21st the largest was 

 19 mm., while some were only 10 mm. long ; on the 

 17th of July the largest had become 21 mm., others 

 remaining still very small ; and the last examination 

 made by Mr. Buckler — 18th of September — found 

 them in the same condition. Meanwhile, Mr. Fletcher 

 had noticed that from the first some of the larvse 

 which he was rearing were bent on outstripping the 

 rest, though they were all kept together and received 

 precisely the same treatment ; and during the summer 

 of 1883 he bred two moths, and probably would have 

 bred more had he not killed several of his largest 

 larvse by keeping their food too dry through the 

 winter, when he supposed they were hibernating ; but 

 by far the largest number of his larvse lived over 

 1883, and hibernated a second time, as was the case 

 with all those in Mr. Buckler's care. These last came 

 into my possession, and on the 17th of March, 1884, 

 I measured one fully 26 mm. long when extended in 

 walking, and about 22 mm. when at rest, and this, I 

 think, would be the full-grown length; on the 13th of 

 June I found I had three or four cocoons formed, and on 

 the same day I received four other cocoons from Mr. 

 Fletcher, two containing pupse, and two larvse yet 

 unchanged. Mr. Fletcher bred the rest of his moths 

 in June and July ; mine all emerged between the 12th 

 of July and the 3rd of August, and on the 26th of 

 July Mr. Fletcher sent me eggs from a captured 

 moth. 



The lifetime, therefore, of an individual of this 

 species may be either one or two years in duration, 

 out of which period its egg-stage occupies three 

 weeks or less, its pupa-stage about a month, and the 



