68 INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



of whale oil soap and 100 gallons of water and the carbolic acid emulsion 

 is also excellent for killing the nymphs and adults. 



Natural Enemies.— The two-spotted ladybird beetle (Adalia hipunc- 

 tata Linn.) and the green lacewing (Chrysopa calif omica Coq.) feed 

 upon the eggs and larvae of the pear psylla. 



THE LAUREL PSYLLID 



Trioza alacris Flor. 40 

 (Figs. 56, 57) 



Description. — The adults look much like large plant lice, but 

 jump quickly when disturbed. They are about 3-16 inch long, slen- 

 der and vary from greenish-yellow to light brown. In the darker 

 individuals the dorsum is streaked with brown. The antennae are 



Fig. 56. — The laurel psyllid, Trioza alacris Flor. Tip of laurel 

 branch showing the curled leaves produced by the young cottony 

 covered nymphs which are also present. Natural size. (Original) 



about one and one-third times as long as the width of the head, 

 slender and dark at the tips. The legs are slender with two black 

 spines on the inside and one on the outside of the tips of the tibiae. 



<0 Crawford, D. L., Bui. 85, U. S. Nat. Mus., pp. 94-95, 1914. 



