THE CANADIAN ENTOMOLOGIST. 277 



This statement, published in April, 1878, is strikingly at variance with 

 his former notes upon this species in part 9 of Butt. N. A., 1., issued in 

 January, 1872, pages 117-118 of the volume, where, after recounting the 

 large number of enemies which prey upon it, he says, " It is doubtful if 

 much more than two per cent, of the eggs laid produce butterflies." 



Mr. Winn collected early in September from off the fence over which 

 his hop vine grew 32 chrysalids, being the result of the eggs laid 3rd and 

 4th August, which he had left upon the vine. From these only two but- 

 terflies emerged, both on i8th September, and, curiously enough, one was 

 a ^ Umbrosa and the other a $ Fabricii. All the others were attacked 

 by parasites, which Mr. W. H. Harrington determined as Pteromalus 

 puparum, Linn. 



The following notes upon the eggs were made by Mr. Lyman ; 



In regard to the colour, number of ribs, etc., of the eggs, there is 

 considerable divergence among the authorities. 



In regard to the colour, Scudder, quoting Riley, says that at first they 

 are dull bluish-green, afterwards becoming grayish-green with silvery 

 reflection. Edwards and Fernald call them " pale green," and this I con- 

 sider correct, as I could see no trace of blue-green about them. Edwards 

 says that the eggs have eight or nine vertical ribs, and is followed by 

 Fernald. Edwards also says that the eggs laid in strings have always the 

 same number of ribs, and hence Scudder deduces the theory that indi- 

 vidual butterflies always lay eggs of the same number of ribs, but the latter 

 author gives the number of ribs as "nine to eleven, commonly ten." 



Of the loi eggs laid by my butterfly in confinement, 24 were laid on 

 the leaves, 3 being above and 21 below, and the rest, except 2, on 

 the gauze. 



There were ten strings of two, four strings of three, one pyramid 

 formed of two below and one above, and another formed by one standing 

 upright upon one on its side, and sixty-four singles. Some of the strings 

 were very irregular, and some had apparently been laid at different times. 



Of 52 eggs examined, 31 had 9 ribs and 21 had 10. One of 9 

 ribs, with larva nearly ready to hatch, had a green newly laid egg with 10 

 ribs on top of it. 



In striking contrast to its abundance in 1896, only one specimen of 

 this butterfly was seen during the season of 1897 by Mr. Winn, 



