550 Notes in 1887 upon lepidopterous larve, ée. 
than those which had ceased feeding (which were respec- 
tively about 70°0 and 75°0 mm. long when extended 
in walking. 
Nov. 1st.—Division I.: The last larva ceased feeding 
Oct. 31st. 
Division II.: The last larva ceased feeding at this 
date, or on Oct. 31st. 
Although the larve burrowed, and in one or two 
instances constructed earthen cells, not a single one 
pupated. Their dead bodies were found when the earth 
was examined at the time when the moths should have 
emerged in 1888. This could not be traced to any 
treatment which they had received; the earth was 
moist, and besides their death took place at too early a 
date to have been produced by dryness. The lengths of 
the mature larve were certainly less than in those which 
are found in the wild state. Thus Mr. Buckler describes 
a larva as being 4 in. in length (J. c.), while mine were 
not much over 8 in. in any case. 
The larve were fed upon Convolvulus arvensis, except 
during the last few days, when it was difficult to obtain 
a sufficient supply of food, because of the frosts. 
Convolvulus sepiwm was then supplied with the former 
food-plant, and the larve ate both indiscriminately. 
GENERAL ConcLusions.—Duvration oF Larva Lire.— 
The duration of the stages and the lengths of the larve 
may be estimated as follows .— 
Development in the egg 10 days. | Length of newly-hatched larva, 
3°75 mm. 
Duration of Stage I. .. 93 ,, | Length atend of Stage I., 8:25 mm. 
” ” . oi Ae) ” ” ” ” 1UEY, 14:0 ” 
4 Lo TEDicher SY 4, + ib MiG, ban Sass 
” ” IV. -- 12 ” ” ” ” BYig 41:0 ” 
Ae Nis -- 13 ,, ” ” i Wa Oy, 
Each of these figures was estimated from the data 
given at the end of each stage. The whole period of 
larval life may be taken as extending from about Sept. 
8th to about Oct. 29th—a period of fifty-one days. If 
the estimated lengths of the five stages be added up, it 
will be found that they also come to fifty-one days. It 
is therefore almost certain that the estimated lengths of 
the stages are very nearly correct, and they were obtained 
on the supposition that the larve which first changed 
their skins at the end of any stage would be the first to 
change them at the end of the succeeding stage. This 
