64 
PS VC f IE 
[June- August 
exclusion. It then molted during the evening of July 12th, and was again fed at 
8 P. M., 14th July. Length after ecdysis, 2.1 mm.; after feeding, 2.5 mm. The 
second molt occurred at 4 P. M. 14th of July, and food was again taken at 10 
P. .\ 1 .; 1 8th July, for the only time in the third instar. Length after ecdysis, 
2.75 mm.; after feeding, 3.2 mm.. The third molt occurred at 6 P. M., 22nd 
July, and food was given three (3) hours afterwards, though with much trouble, 
for attempts to escape were persistently made, the insect being annoyed by the 
strong lamp-light. When shaded from the light, it soon went to food; this was 
repeated a second time. Once at food, the presence of light, apparently, did not 
annoy it. Length after third ecdysis, 3.25 mm; after feeding, 4.3 mm. It was 
showing signs of approaching ecdysis at noon, 26th July, and molted a fourth 
time at 7 .\. M., 28th July. 
In the fifth instar, it was fed at 9 P. M., 29th July. Length after ecdysis, 
4.3 mm.; after feeding, 5.00 mm. The final (fifth) ecdysis occurred on the 
morning of August 3rd. Length after ecdysis, 5.00 mm. It died in confinement 
without food on 13th September. 
It is apparent from this, that measurements of length after a full meal, 
approximate the length of the insect after the ecdysis following this meal. For 
example, a nymph measuring 5.0 mm. after a full meal in instar V, would 
measure approximately 5.0 mm. when adult. It is also indicated that more food 
is needed in the first instar, than in the rest. .\ single meal suffices, apparently 
for all instars after the first, a conclusion drawn from four ( 4) individuals reared 
during different periods throughout the season of 1904. 
3. Length of instars. 
The following table, summarizing the instars of four individuals, repre- 
sents durations of stages under optimum conditions, under fair conditions, and 
under adverse conditions, when the food supply is highly inconstant and variable. 
A, under optimum conditions, having a constant host, was fed as soon as pos- 
sible after each ecdysis, as the nymphs naturally do, if possible. P> and C, under 
so-called fair conditions, were fed at shortly varying time periods, representing 
an intermittent host; they were fed at the same time, until in instar III, 
refused food, and thus dropped behind. I), under adverse conditions having a 
periodical host, was fed at greatly varying time-periods, at first, more for the 
purpose of causing very unequal instars to show the relation of food supply to 
development, than for anything else, and was afterwards included in this table. 
