620 Report of Entomologists op the 



work resembled so closely the work on plants of many of the plant 

 lice, I mistook the injury for the work of plant lice. On investi- 

 gating the trouble, although a few plant lice were found, the cause 

 was found to be the work of an immature form of a species of 

 Psyllidte. 



This insect closely resembles the pear psylla, and will probably 

 do as much damage as the latter in case its native wild food plant 

 ever becomes scarce, or a series of favorable years should occur for 

 such an increase that the wild blackberry would not furnish enough 

 food for it. Even though there is an abundance of wild plants, it 

 will cause some damage each year. 



Life-history, — At the time (August 6, 1894) this injury to black- 

 l>erries was hrst noticed no adult insects could be found. ]^o pupal 

 forms were found until September 12th, The first winged forms 

 were reared from these September 29th. Specimens of these were 

 submitted to Mr. Charles W. Mally, of Ames, Iow\h, who deter- 

 mined them to be Trioza tripimctata. After October 15th, only the 

 winged adults could be found within the curled leaves. During the 

 month of October, I had occasion to visit the nurseries of R. P. 

 Jeifery & Son, of Bellmore, N. Y., and of P, H, Foster, of Babylon, 

 N, y. These gentlemen had cultivated blackberries. Not a new 

 cane could be found in their imrseries which was not distorted and 

 dwarfed by the work of this pest. As yellow pine as well as wild 

 blackberries grew in abundance in the vicinity of these nurseries an 

 effort was made to find evidence of the work of this insect on the 

 pines. There was plenty of evidence of their work on the wild 

 blackberries, but no signs of work or of the insects could be found 

 on the pines. Later in the fall a few adults were still to be found 

 hidden away in the curled dry leaves which adhered to the canes. 

 In an examination of the curled leaves of blackberries on March 

 11, 1895, I did not succeed in finding any of the adult insects. 

 During the early spring an occasional specimen was found on pine 

 trees. 



About the first of June the adults were observed working on the 

 new canes of blackberry, causing the leaves as well as the ends of 

 the canes to curl. On June 28th, a few minute larvse were found 

 within the curled leaves. At the same time the eggs were found on 



