52 report of search for enemies of citrus white fly. 
India. 
The main portion of this bulletin is devoted to a treatment of two 
natural enemies of Aleyrodes citri, so no further mention of these 
species is necessary. Chrysomplialus aurantii, the red scale so inju- 
rious to citrus fruits in California, occurs throughout India, but 
in such slight quantities as to produce little injury. Sometimes 
individual trees in shady situations are severely infested, but such 
instances are very infrequent. The scale on such trees is invariably 
found to be heavily parasitized by a species of the hymenopterous 
genus Aphelinus. Chilocorus nigritus Fab., an oriental coccinellid, 
also attacks this scale. Pseudococcus citri, the citrus mealy bug, was 
very seldom seen in India and in those instances observed was under 
perfect control. It is quite probable that the species is attacked by 
natural enemies. 
APPENDIX D. 
COCCINELLID^! INTRODUCED FROM INDIA. 
Several species of ladybirds of economic value were included with 
the shipments of the natural enemies of the white fly- All have failed 
to develop with the exception of two species, (Jhilocorus nigritus Fab., 
which preys on various species of Coccidae, and Chilomenes sexmacukh 
tus Fab., which preys upon aphides. 
OhUocorus nigritus did admirable work against Chrysomphalus 
aurantii in certain parts of India and was introduced in the hope that 
it might prove of economic value if established in this country. It 
is at present being successfully reared in California and Florida. 
Chilomenes sexmaculatus feeds on various species of Aphididae, It 
is a rapid breeder. One female in captivity has deposited over a 
thousand eggs. Vast numbers of this species have been reared and 
liberated in both California and Florida. 
APPENDIX E. 
FUMIGATION OF CITRUS TREES IN SPAIN. 
When the writer stopped in Spain in 1910, while en route to India, 
no fumigation had ever been practiced. Chrysomphalus dictiospermi 
and Parlatoria zizyphus were such serious pests as to have become a 
menace to profitable orange production in certain parts of the country. 
The growers affected were eager for some method to control these 
insects even as were the orchardists of California when the cottony 
cushion scale was such a pest before Novius cardinalis had been 
introduced. 
The writer spent the month of August, 1910, in Spain in an attempt 
to demonstrate the efficiency of fumigation with hydrocyanic-acid 
