458 Report op the Entomologists of the 



have been exposed in the building shown in the plate and in 

 others in their immediate vicinity, all night without the least 

 apparent injury. 



A closely allied species common in New Yorh. — This insect, 

 Aspidiotus ancylus Putn., resembles the San Jos^ scale in gen- 

 eral appearance and is frequently mistaken for it. It is not a 

 serious pest in this State, however, but in the south it may occur 

 in sufficient numbers to do serious injury to the infested plants. 

 Its life history has not been worked out for this locality. 



We have frequently found this species in the nursery, usually 

 on young plum trees, but in no instance were the scales in suffi- 

 cient numbers to injure the trees to an appreciable extent. 



According to Prof. T. D. A. Oockerell* this scale is found up- 

 on ash, maple, beech, linden, oak, osage orange, peach, hackberry, 

 bladder nut and water locust. 



PLANT LICE. 



The nature of these insects in general need not be enlarged 

 upon here as the principal prints in their development will be 

 touched upon in another bulletin. These insects were unusually 

 abundant last year in both nurseries and orchards. One of the 

 species, nyalopterus pruni, which was abundant on the plum last 

 season is shown at Plate XXIV, fig. 5. This species was also 

 very abundant in some of the nurseries examined last season but 

 will be discussed more in detail in the bulletin above referred to. 



The Woolly Louse of the Apple. 

 ScMzeneura lanigera Hausm. 



The writer has found this species more common in New York 

 nurseries than any of the other injurious insects. As a rule 

 apple trees were the worst infested, but blocks of pears or quince 

 trees growing next to blocks of infested apples, were also usually 

 infested. 



The life history and habits of this insect together with its im- 

 portance as a nursery stock pest are discussed by the writer in 

 the Annual Report of the Station for 189G, pages 570-577, and 

 hence it will be unnecessary to discuss these points in detail here. 



♦U. S. Dept. Agr. Dlv. Ent. Bui. No. 6, technical series, p. 20. 



