COCCID^ AND THEIR ENEMIES ABROAD. 
49 
APPENDIX B. 
INSECT PESTS OF CITRUS TREES SEEN BY THE WRITER DURING 
HIS INVESTIGATIONS IN VARIOUS FOREIGN COUNTRIES. 
Chrysomphalus aurantii (Mask.). 
Chrysomphalus aonidum (L.). 
Erium sp. 
Monophlebus dalbergix Green. 
Pseudococcus citri (Risso). 
Aspidiotus latanise Sign. 
Lepidosaphes beckii (Newm.). 
Lepidosaphes lasianthi (Green). 
Coccus hesperidum (L.). 
Fiorinia thex Green. 
Vinsonia stellifera (Westw.). 
Aleyrodes citri R. & H. 
Aleyrodes, 3 species (undetermined). 
Papilio demoleus L. 
Phyllocnistis citrella Stain ton. 
Bud moth (Agonopteryx sp.). 
Borer. 
SPAIN. 
Chrysomphalus dictiospermi (Morg.). 
Parlatoria zizyphus (Lucas). 
Pseudococcus citri (Risso). 
Lepidosaphes beckii (Newm.). 
Lepidosaphes gloveri (Packard). 
Aspidiotus hederx (Vail.). 
Saissetia oleae (Bern.). 
Coccus hesperidum (L.). 
ITALY AND SICILY. 
Chrysomphalus dictiospermi (Morg.). 
Parlatoria zizyphus (Lucas). 
Lepidosaphes beckii (Newm.). 
Pseudococcus citri (Risso). 
Aspidiotus hederx (Vail.). 
Saissetia olex (Bern.). 
Coccus hesperidum (L.). 
The determination of almost all the Coccidae included in these lists 
has been made by Mr. E. R. Sasscer, of this bureau. The scale 
insects have been arranged in order of economic importance in so 
far as was possible from the observations of the author and informa- 
tion available. Without doubt the most serious insect pest in India 
is Phyllocnistis citrella, a leaf-mining lepidopteron. It is especially 
destructive to young nursery stock. While the infestation of indi- 
vidual trees by other of the Indian citrus pests is occasionally some- 
what severe, these infestations are not so general as to be of com- 
mercial importance. 
APPENDIX C. 
OBSERVATIONS ON COCCIDffi AND THEIR NATURAL ENEMIES 
IN SPAIN, ITALY, SICILY, AND INDIA. 
Most species of Coccidss and Aleyrodidse seen during the writer's 
travels in tropical and semitropical regions were parasitized to a 
greater or less extent. Some species appeared to be attacked by a 
single natural enemy while other species were affected by several. 
It might be safely stated that the combination of climatic conditions 
with natural enemies keeps all scale and aleyrodid enemies of citrus 
trees in India under commercial control except for occasional spo- 
radic outbreaks. In Spain, Italy, and Sicily also climate and natural 
enemies have proved of great efficiency against numerous citrus- tree 
scale pests. 
