THE ENTOMOLOGIST. 201 
former month, and four in the latter; that of the three species 
of Vanessa, Io appeared one day before Urtice, 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 Pieride, Brassica; 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 the space of. three months, some for two, and others 
during only one; and that as regards the number of speci- 
mens seen, Satyrus Janira was decidedly the most abundant; 
and that on no one day were more than seven species observed. 
Compare also the following :— 
March Ist—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; 
llth, one; 19th, one; 20th, three; 2lst, four; 22nd, six; 
23rd, six; 24th, three; 25th, four; 26th, four; 27th, seven; 
28th, five; 29th, five: appearances, fifty-four. May Ist, one 
species seen; 2nd, two; 5th, one; 6th, one; 8th, one; 
16th, one; 17th, two; 18th, six; 20th, one; 21st, three; 
22nd, two; 24th, three; 26th, one; 29th, one; 30th, five ; 
8lst, four: appearances, thirty-five. June Ist, two species 
seen; 2nd,four; 3rd,three; 4th, three; Sth, four; 6th, two; 
7th, two; 9th, five; llth, one; 19th, one; 2lIst, 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 
