110 THE ENTOMOLOGIST. 
presented itself in the spring, however: though apparently 
quite healthy, they absolutely refused to grow, and this sort of 
thing continued until the end of the summer, and long after 
the imagos should have been out, the larve being even then 
little more than a quarter of an inch in length. Indeed, as it 
appeared evident they would hybernate a second time, [ got 
thoroughly tired of them, and either turned them out or gave 
them away, I do not remember which. The other brood is 
from a few eggs I obtained last summer, and the larve thus 
far have acted in precisely the same manner as did the 
former ones: when examined yesterday many of them seemed 
quite healthy, but show no disposition to feed, though there 
has been food growing in the cage throughout the winter, and 
now looks beautifully fresh. The cage has been kept during 
the winter in a greenhouse (no artificial heat) in the garden. 
Larve of various Acidalia and other species, kept under 
precisely the same conditions, have been feeding several 
weeks.—Geo. T. Porritt; Huddersfield, April 2, 1874. 
Breeding Teniocampa opima.—\ have read your corre- 
spondent Mr. W. H. Tugwell’s account of the way in 
which he successfully reared the larve of Taniocampa 
opima last year (Entom. vil. p. 86). I was equally successful 
with my brood of that species, though with a totally different 
kind of treatment. The previous year I had lost every cater- 
pillar, I supposed through having kept them rather closely 
confined (the plan which has succeeded in Mr. Tugwell’s 
case), so last year 1 kept them in a roomy cage, which was 
placed close to a small, constantly-open window ; this kept 
the larve nearly always in a draught, sometimes a strong 
one. The brood was a large one, and fed up fast on willow, 
and a healthier or finer lot I think I never saw; scarcely one 
seemed to be lost. Has not the season something to do with 
it? Opima seems to have been much easier to rear last year 
than it was the previous one. Willow, too, seems decidedly 
the most satisfactory food.—Jd. 
Migration of Butterflies—My. Belt, in his interesting 
work, ‘ The Naturalist in Nicaragua, pp. 152—154, speaking 
of this curious fact, says that the butterflies (‘Timetes Chiron) 
were all flying in a south-easterly direction, and that the 
beautiful day-flying moth (Urania Leilus) also joins in this 
annual movement. Many other travellers have observed 
