12 
OBSERVATIONS UPON 
twigs. The female has a very peculiar method of 
protecting her eggs. They are first deposited in a 
compact cluster and then covered with a gluey sub¬ 
stance that is very impervious to water. After 
this is done, it seems that the moth must lay her 
abdomen at full length in this sticky covering and 
leave it there until the glue has sufficiently hard¬ 
ened to hold fast the scales when the insect with¬ 
draws its abdomen. Figure 6 represents one of 
these shingled egg-clusters after the abdomen has 
been removed. The breaks in the lines of scales 
mark the joints of the abdomen. The eggs are in- 
Fig. 6.—An egg-patch of the Box-elcler Leaf-roller, Cacaria ssmifera- 
na, covered with scales from the abdomen of the moth(original). 
variably covered in this manner and so imitate 
little, light colored spots of the bark that they are 
not easily seen. 
I have examined trees in the vicinity of Gree¬ 
ley and also in the vicinity of Fort Collins the past 
winter and find that the eggs of the two leaf-rollers 
are very abundant upon fruit and box-elder trees, 
