CITRUS FRUIT 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 



June 



July 



August 



September. 



October 



November . 

 December. . 



January.. 

 February . 



March 



April 



June... 

 July.... 

 August. 



1910. 



1913. 



>F. 

 72 

 79 

 70 

 83 

 84 

 95 

 102 



"F. 



71 

 77 

 84 

 75 

 94 

 86 

 97 

 100 

 96 

 86 

 79 

 70 



>F. 



92 

 93 

 105 

 93 

 80 

 70 



70 

 71 

 73 

 79 

 93 

 87 

 106 

 92 

 83 

 79 

 74 



95 



107 



'F. 



"F. 



1 In converting centigrade into Fahrenheit, fractions have been discarded. 



WASHINGTON : GOVERNMENT PRINTING OFFICE : 1914 



