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into lethargy, passed their second moult. By 20th September, 

 after that moult, all had become lethargic. I got another lot of 

 eggs 8th September, or 17 days later than the first. These hatch- 

 ed 22d September, and a week later, on the 15th September, I 

 got more eggs, so that this generation was at least ovipositing 

 from 2 1st of August to 15th September, or during 24 days. On 

 2d October, still at Hunter, I recorded in my notebook, "Cool 

 weather, but no frost yet. Of the two broods of Mynna, all 

 are lethargic, after second moult." The caterpillars of the third 

 and last brood, from eggs laid 15th September, had passed first 

 moult when I left the mountains, and died before I reached Coal- 

 burgh a few days later. Now if any caterpillars of this species 

 ever become lethargic at once from the Qgg, it would have been 

 these last broods. 



Let us summarize these observations and see what result. 

 In June I found the first generation of butterflies of the 

 year flying, and they had been out some weeks. This is Mr. 

 Scudder's " vernal brood," and which he says do not (because 

 they cannot — their eggs not developing for a long time yet — )lay 

 their eggs until the latter part of July or early in August. I, 

 however, did obtain eggs from them on 19th and on 27th of June, 

 and the females laid as soon as confined over the food plant, and 

 abundantly. The first butterflies from the eggs of 19th of June 

 emerged 15th July; the first from the eggs of 27th June on 23d 

 July, and the last one on 30th July, so that from these two females 

 of the vernal brood, butterflies in next generation were issuing 

 through 16 days. Now as Myrina had been flying a good while be- 

 fore I reached the mountains, the difference between the emerging 

 of the first and last members of the second generation would 

 have been at least a month, or during all July, we may say. 

 These July butterflies are Mr. Scudder's " festival brood." He 

 says that brood emerges about the middle of July, and " are 

 the butterflies of midsummer," only his (estival brood is not de- 

 scended from his vernal. They can't be because the vernal are 

 physically unable to lay eggs. They are descended from those 

 September caterpillars which went in lethargy direct from the 

 &gg, and so have consumed the spring and early summer in ma- 

 turing. 



Therefore we have got both vernal and festival on the carpet 

 by middle of July, and it would save me from as perplexing a 

 study as a Chinese puzzle, if they would commingle and go 

 about their business. But, as alleged, that is impossible. The 

 vernals are only just getting in condition to lay their eggs, and the 

 aestival, which have been emerging in July, have got to struggle 

 along many weeks yet before their time comes. 



To continue: I got eggs, laid 20th July, of females of the 

 second generation, or Mr. Scudder's " aestival brood," and all 



