CITRUS FEUIT INSECTS IN MEDITERRANEAN COUNTRIES. 
35 
therefore, limited to sections of more or less moisture. In this re- 
spect it is like the black scale, but the black scale does not thrive so 
well in high temperatures, even if accompanied by much moisture. 
The purple scale does not yet occur in the interior counties of southern 
California or in the great valleys of that State. Of course this may 
be due to the close quarantine that has prevailed in those sections in 
recent years against the purple scale. But judging entirely from 
its present distribution, the purple scale appears to be restricted to 
regions of more or less moisture, or at least to those in which the 
combination of high temperatures and low humidity does not prevail. 
Temperatures at Valencia, Spain, and Palermo, Italy, January, 1910, to August, 1913, 
inclusive. 1 
Valencia, Spain. 
Maxi- 
mum. 
Mini- 
mum. 
Mean. 
Palermo, Italy. 
Maxi- 
mum. 
Mini- 
mum. 
Mean. 
January 
February. . 
March 
April 
May 
June 
July 
August 
September . 
October. . . , 
November. 
December. . 
January — 
February . . 
March 
April 
May 
June 
July 
August 
September . 
October 
November . 
December. . 
January — 
February . . 
March 
April 
May 
June 
July 
August 
September. 
October 
November . 
December. , 
January. . 
February . 
March 
April 
May 
June 
July 
August. . . 
1910. 
1913. 
°F. 
72 
79 
70 
S3 
S4 
95 
102 
99 
84 
81 
79 
72 
'F. 
65 
63 
92 
93 
105 
93 
80 
70 
70 
71 
73 
79 
93 
87 
106 
02 
83 
65 
67 
84 
79 
85 
88 
95 
107 
58 
1 In converting centigrade into Fahrenheit, fractions have been discarded. 
WASHINGTON '. GOVERNMENT PRINTING OFFICE : 1914 
