THE OYSTER-SHELL SCALE AND THE SCURFY SCALE. ' fi 
with three distinct keels extending longitudinally along the back. 
Unlike the former species, the scurfy scale is a native North American 
insect, and appears to be less adaptable to the various conditions 
throughout the country, and has thus a more restricted distribution. 
LIFE HISTORY AND HABITS. 
The scurfy scale, like the oyster-shell scale, winters in the egg con- 
dition under the scales. The number which may be deposited by a 
Fic. 3.—The scurfy scale ( Chionaspis furfura). Male at right, female at left. All enlarged. (Authors? 
illustration. ) 
given female, as may be easily verified by examination, varies con- 
siderably. The following records show the number of eggs from each 
of twenty individuals: 
Number of eggs deposited by the scurfy scale. ( Material collected on apple sprouts from 
base of apple stump March 31, 1905, at Arlington Farm, Virginia.) 
1 
ps Eggs. | Pe Eggs. | poe Eggs. | ae Eggs. 
|| } 
1 61 6 74 =| at 54 | 16 82 
2 18 7 78 12 61 17 23 
3 78 8 70 13 48 18 83 
4 98 9 19 14 68 | 19 21 
5 53 10 41 15 78 | 20 33 
. Average number of eggs per scale, 57.5. 
