28 REPORT OF SEARCH FOR ENEMIES OF CITRUS WHITE FLY. 
a second set of potted nursery trees (PL VII, fig. 2). The trees were 
carefully examined before being introduced into the house in order to 
destroy any of the pests that could be seen. This was not difficult 
of accomplishment, as the pests pupated in the trees. Inspection 
was continued every few days so that the plants were soon free of the 
pests and in due time the development of young growth followed. 
Notes on the Life History of Aleyrodes citri in Northern 
India. 
The following notes on the life history of Aleyrodes citri on citrus 
were made at Lahore during 1911 and might be said to be typical 
of this insect in the great plains of northern India. Observations 
made at different times of the year in other parts of India would 
tend toward the probability that the development recorded in the 
northern part would also be more or less applicable to central India. 
On May 1-4, 1911, the earliest dates of observation, the white 
fly was in the egg and larval stages. Calculating on the basis of 
the conclusions of Morrill and Back in their white-fly investigations 
in Florida that during the spring the duration of the egg stage 
averages somewhat less thantwo weeks, it would appear from the 
stages of development existing at Lahore on May 1 that the first 
brood of adult flies had emerged during the earlier part of April. 
This conclusion was somewhat corroborated by information from a 
native entomologist who stated that he had seen adult Aleyrodes in. 
great numbers during the first part of April about the citrus hedge 
which the writer had found well infested and which he had selected 
as a basis for operations in collecting. Circumstances prevented a 
close observation of white-fly development between the middle of 
May and June 11, but an examination on the latter date showed the 
insects to be in the pupal stage. By June 24 the pupa3 were almost 
fully matured and in a lew individuals the purple eyes of the adults 
had commenced to be prominent. On June 25 a small number of 
adults emerged and this emergence continued during the following 
two or three days. Emergence had stopped and practically all 
adults disappeared by June 29. From this time throughout July 
and up to August 20, a period of about eight weeks, the insects appeared 
to remain perfectly dormant. The last 10 days of August were a 
period of great activity. Excretions of honeydew appearing on the 
pupse between August 20 and 25 marked the first evidence of activity 
following their dormancy during the hot, dry summer. From August 
26 to 30 the pupae rapidly thickened and the purple eyes and whitish 
wings of the adults became evident through the thin pupal cover- 
ing. The first adults commenced to emerge on August 31, and within 
a week or ten days the flight was as its height. By September 13 
practically the entire brood had emerged. On September 20 very 
