34 REPORT OF SEARCH FOR ENEMIES OF CITRUS WHITE FLY. 
Prospaltella lahorensis, the True Internal Parasite. 
It has been stated in another part of this bulletin that the first 
definite discovery of parasitic action on Aleyrodes citri was made at 
Lahore, India. Also it was here that at a later date living material 
of the parasite was first seen. While no special attempt was made to 
work out the life history of this insect, numerous observations taken 
during the summer of 1911 while preparing material for introduction 
into Florida furnish some definite information on certain points of 
value. 
Adult parasites could be found at any time between May and 
November. They were most numerous during the months of May 
and September. Although found in June, July, and August, they 
were so scarce that it frequently required several minutes before a 
single specimen could be located. Moreover, during this time of 
great heat a large percentage of the parasites died within the host 
before maturity. As no evidence of hyperparasitism was evident 
and since this mortality occurred at all stages of parasite develop- 
ment, the writer is inclined to attribute this mortality to the effects 
of the hot dry climate. Observations would lead us to believe that 
at no time did parasitism of the fly exceed 1 per cent. 
The parasite prefers the larval stages of its host, but when necessary 
will oviposit in the pupse. Parasitized larvae and pupae develop a 
much greater thickness than healthy ones. They also soon lose their 
transparency, becoming opaque, and this renders them easy of detec- 
tion. By the use of a lens the parasitic larvae, which are of a whitish 
cast, can be seen within the white-fly host. On reaching the pupal 
stage the parasite becomes very dark, almost black, so that at this 
time parasitized white flies containing pupa cases appear very dark. 
Having attained maturity the parasite eats a small hole in the dorsum 
of the host and through this opening emerges into the open air. 
Parasitized Aleyrodes are largely confined to the shadiest part of 
the plant. The parasite is apparently distributed throughout the 
citrus-growing region of the Indian Empire. 
Infesting Young Orange Trees with Aleyrodes citri. 
It has been stated under another paragraph that young trees 
infested with living white flies were necessary for the safe trans- 
mission of parasites from India to Florida. Since young trees infested 
with the white fly were not available in that country, infestation was 
secured in the following way: A large portion of the infested orange 
hedge at Lahore had been protected by a heavy canvas awning. 
(See PL VIII.) Under this awning immediately adjacent to the orange 
hedge, and on the side away from the midday and afternoon sun, was 
constructed a narrow platform for potted citrus trees. This platform 
