THE CAMPHOR TH1UPS. 5 
reared on camphor in cages did not change their appearance or habits 
in any way. The conclusion may therefore be drawn that the 
camphor thrips has originated from another source. Since it does 
not occur on any of the native trees of the family Lauraceae, it, 
in all probablilty, must be an introduced species. No evidence, 
however, has been obtained of its presence in any of the countries 
where camphor trees are indigenous. The specimens received by 
Watson from Ceylon and reported (5) as Cryptothrips fioridensis 
have since been determined as a different species. 
NATURE AND EXTENT OF INJURY. 
The injury from the camphor thrips seems to be confined almost 
entirely to pruned trees or trees previously injured from other causes. 
Fig. 3.— A 40-year-old camphor tree, showing magnificent size which those trees can attain when unin- 
jured by pruning or thrips. 
When grown as an ornamental or shade tree and not cut back, the 
camphor tree is very luxuriant and often attains great size. While 
the thrips can often be found on such trees, they have never been 
seen in large numbers or been known to do any appreciable damage 
to such trees. Many beautiful specimens of the camphor tree can 
be found over the State in regions where thrips occur and are even 
abundant on pruned trees. The tree illustrated in Figure 1 is growing 
on the camphor farm at Satsuma near the fields in which the thrips 
have been most injurious. Figure 3 illustrates one of the largest 
camphor trees in the State. This tree, planted in 1880, now has a 
circumference of 16 feet 3 inches, with an average spread of 60 feet 
and a height also of 60 feet. Throughout its growth it has been 
comparatively free from any pests which have unduly interfered 
with its development. Camphor trees have also proved valuable as 
windbreaks for citrus groves and when planted as hedges and allowed 
