THE ENTOMOLOGIST. 373 



1871, I fed eight weeks, but the nights were cool, and some 

 days were absolutely cold, when the larvae would not eat. 

 These chrysalides I preserved during the winter, and early in 

 June, 1872, I put ihem in this same warm room in which the 

 larvae grew so rapidly, and they were in this room some two 

 weeks before the first larvte of this season were hatched; 

 and, strange as it may appear, some half dozen butterflies of 

 this year's brood came out before these last year's chrysalides 

 produced butterflies. 



Very soon after the last moult I shut a number of the larvae 

 away from food, putting them in paper boxes, from five to ten 

 in a box, carefully labelled. If, at the end of two or three 

 days, the larvae were still wandering about, I fed them 

 sparingly. In this way I did not lose a single specimen in 

 the larva state by shutting away from food ; a few of the 

 chrysalides died. 



It was with the most intense interest that I watched the 

 coming forth of the butterflies, which began to appear in 

 about eight days after assuming the chrysalis stage. Thirty- 

 four males came from my male boxes, and then a rather small 

 female made its apfjearance. Out of seventy-nine speciuiens 

 that I labelled males, three feuiales were produced; on the 

 other hand, those that I fed up, keeping them on a good 

 supply of fresh food, 1 labelled females, and placed them in 

 separate boxes. Out of these boxes sixty-eight females came, 

 and four niales. 



There were some boxes that I marked doubtful, which I 

 do not include in the above figures. For instance, I took five 

 larvae that were eating vigorously : if let alone they probably 

 would have eaten a day or two longer, but I wished to try 

 them in all stages of growth, and these were of quite a large 

 size ; out of these five, four were males. 



Soon after the last moult 1 took twenty larvae, and shut 

 them away from food for twenty-four hours. At the end of 

 that time I replaced ten on a good su))ply of food, watched 

 them carefully, and kept them eating, until they attained a 

 large size: they became chrysalides within a few hours of 

 each other, and emerged as butterflies eight days after. One 

 of these chrysalides was accidentally crushed ; the remainiug 

 nine were females. Of the starved ones, eight males came 

 out; the remaining two chvsalides died. 



