'5 



until the year 1889 was the apparent discrepancy cleared up. In the 

 Entomologist's Monthly Magazine for 1889, Newstead states that he 

 bred quantities of males which were about evenly divided between 

 winged and apterous individuals. In recent years we have learned 

 that it is not an uncommon occurrence for males to be both winged 

 and apterous in the same species. 



This species is found only on the bark of its host-plants. On 

 ash it confines its attack to the young and tender growth, avoiding 

 the trunk and larger limbs. It often becomes so abundant as to 

 cause injury to the tree. 



In the preparation of the description of this species I have had 

 a very large amount of material for examination, from a wide range 

 of localities in Europe. The specimens were sent me under the 

 old specific names of populi, alni,fraxini, vaccinii tt\& aceris as well 

 as salicis. A series of slides has been made from each lot of speci- 

 mens received and an examination of these slides, as well as of the 

 scales, in situ on the bark has led me to believe them all to belong 

 to the same species, and as salicis has priority over the other names, 

 it has been retained. Other authors have believed fraxini to be 

 only a synonym of salicis and Signoret doubted if populi was a valid 

 species. Reuter in 1896 placed raccinii also as a synonym of salicis. 

 In his original description of aceris, Signoret states that the eggs 

 are of a greenish color, while in salicis they are known to be reddish 

 purple. In all species of the genus as far as they have been 

 described, or as far as I have observed them, the eggs are alike in 

 color and in no case have I known of their having any greenish 

 tinge. Moreover dead and shrivelled eggs of aceris are of precisely 

 the same color as eggs of salicis in the same condition. I am there- 

 fore led to think that Signoret was mistaken and have placed aceris 

 also as a synonym of salicis as there are no structural characters by 

 which to separate them. 



No enemies of this species have been recorded. 



CHIONASPIS CORXI n. sp. 



SCALE OF FEMALE. Plate 2, Fig. i. Length, 1.6 2 mm. Dis- 

 tinctly broadened posteriorly, rather thin, white. Exuviae .7 mm., 



