Insects, etc., Injurious to the Pluyn. 



393 



previously. The grower wrote later that he had watched for them, 

 and cleaned the trees with soft soap and quassia. They all fell to 

 the ground, and he thought they had been made an end of, but on 

 the following day they had revived, and were all up the trees again. 



The effect of these Yellow Leaf Hoppers on plum and apple is 

 very similar to that of the Ti/pJiloci/ha, but in nuts they produced a 

 curious split and jagged appearance of the leaves (Fig. '2CA)). 



In life-history they differ from the pretty Typhlocijlja. Like the 

 latter, liowever, they hibernate as adults and nymphs, and in very 

 much the same positions ; in fact, they are frequently found in com- 

 pany during the winter. 



The earliest time they have been noticed on nuts is the 2nd of May, 



•2C2.— YELLOW LEAF HcipPER (Chhrritct jiai: 

 (Greatly t-nlargc-.l.) 



but doubtless they are about before then. Eggs are laid in June, and 

 another brood appears in August. Some eggs were brought me 

 as late as the 23rd of October, and I saw one or two still unhatched 

 on the 17th of November. A single individual was seen active early 

 in December, the weather having been particularly open. I believe 

 these Chloritcv have three, not two, broods. The eggs are laid by the 

 female on the undersides of the leaves, not under tlie epidermis, as 

 in the former genus. The egg is white, broadly spindle-shaped, with 

 prominent ribs running from pole to pole. Length 8 mm. 



The ova hatch in August in about eleven days, and the nymphs 

 at once commence to feed (18). 



The nymphs have been observed to moult five times, and reach 

 maturity in about five weeks, a few in thirty days (18). When first 

 hatched they are very pale, almost white, but darken as they grow. 



