THE ENTOMOLOGIST. 201 



former month, and four in the latter; that of the three species 

 of Vanessa, lo appeared one day before Urticoe, and five 

 days before Polychloros; that Polychloros, the latest of the 

 Vanessas, was seen between three and four weeks before the 

 earliest of the Satyrids, Egeria, and eleven days before the 

 earliest of the Pierida;, Brassicee; that no one of the said 

 fifteen species was seen by me during all the four months in 

 question, — March, April, May, and June, some being seen 

 during tlie space of three months, some for two, and others 

 during only one; and that as regards the number of speci- 

 mens seen, Satyrus Jauira was decidedly the most abundant; 

 and that on no one day were more than seven species observed. 

 Compare also the following : — • 



March 1st — 17th, no species seen ; 18th, one species seen ; 

 23rd, two ; 24th, three; 28th, four; 29th, one : appearances, 

 eleven. April 3rd, two species seen ; 7th, two ; 8th, one ; 

 11th, one; 19th, one; 20th, three; 21st, four; 22nd, six; 

 23rd, six; 24th, three ; 25th, four; 26th, four; 27th, seven ; 

 28th, five ; 29lh, five : appearances, fifty-four. May 1st, one 

 species seen ; 2nd, two ; 5th, one ; 6Lh, one ; 8th, one ; 

 16th, one; 17th, two; 18th, six; 20th, one; 21st, three; 

 22nd, two; 24th, three; 26th, one; 29th, one; 30lh, five; 

 31st, four: appearances, thirty-five. June 1st, two species 

 seen ; 2nd, four ; 8rd, three ; 4th, three ; 5th, four ; 6th, two ; 

 7th, two; 9th, five; 11th, one; 19th, one; 21st, two; 

 22nd, one ; 23rd, one ; 25th, two ; 26th, one ; 27th, four ; 

 29th, one : appearances, thirty-nine. Aggregate of appear- 

 ances : — March, eleven ; April, fifty-four; May, thirty-five; 

 June, thirty-nine. So that in March butterflies appeared 

 only on five days out of thirty-one; also that in the ninety- 

 one days of April, May, and June, butterflies were seen on 

 forty-eight days ; not seen on forty-three. Also that on 

 fifteen out of the thirty days of April butterflies were noticed, 

 on sixteen out of the thirty-one days of May, and on seven- 

 teen out of the thirty days of June. In the first half of May 

 the cold weather contributed greatly to their disappearance. 



The average number of species witnessed, moreover, is 

 higher in April than either May or June : as in April seven 

 species were seen once ; six, twice ; five, twice ; four, three 

 times. In May six species were seen once; five, once; 

 four, once. In June five species were seen once ; four, 



2d 



