64 Journal New York Entomological Society. 1 Vo1 - xxvu. 



leaves, several of the latter least affected were found to be infested ! 

 with both winged and wingless forms. They of course were inac- ■':-' 

 tive due to the low temperature. 



The infestation in the nursery was somewhat scattered, and while *' 

 some leaves were badly infested, the resulting injury was not very 

 apparent, as infestation could usually only be determined by examin- • 

 ing the under surface of the foliage. Parasitism was in evidence, J*, 

 but not sufficient to materially check the development and continua- e. 

 tion of the species throughout the summer. The parasite bred from 

 the aphids was determined by Mr. Gahan through the courtesy of 

 Dr. L. O. Howard as a species of Aphidius. 



The plant lice noted in the several localities were evidently all of 

 one species which was identified by Prof. C. P. Gillette as Aphis gos- 

 sypii Glover. According to Dr. Patch (Food Plant Cat. of Aphididse 

 of World, Maine Agric. Exp. Sta. Bull. 270) there are three other 

 species infesting species of Hibisci, Apris Malvcr Walker, A. medi- 

 caginis Koch and Rhopalosiphum dianthi Schr. 



Leaf Hoppers. 



On nursery plants of hibiscus both at Rutherford and South 

 Orange, adults and nymphs were observed infesting the lower sur- 

 faces of the leaves. They were not abundant, but judging from the 

 fact that some of the nymphs were very young, it was quite evident 

 that oviposition and development occurred on the plants. Infesta- 

 tions occurred throughout the season and as late as October 24 both 

 nymphs were to be found on some of the leaves at Rutherford. 

 Specimens were kindly identified by Dr. Ball, who stated that the 

 species was Empoasca mail LeB., and wrote as follows : " The speci- 

 mens you sent were unquestionably those of Empoasca mali LeB., the 

 commonly known ' apple leaf-hopper,' which I am going to re- 

 christen ' the potato leaf-hopper.' This species was seriously abun- 

 dant on potatoes throughout the northern section, from Montana 

 east this season. It also attacks nursery stock and water sprouts of 

 apple trees, but not the older and more slowly growing leaves of the 

 apple. This species hibernates as an adult, so far as I have been 

 able to determine, while Empoasca unicolor, which is the real apple 

 leaf-hopper, deposits its eggs in the apple twigs and spends its whole 



